loss of stress due to friction depends upon

Relaxation of Steel Relaxation of steel is defined as the decrease in stress with time under constant strain. Prestressed Concrete Structures Objective Questions, 250+ TOP MCQs on Loss Due to Shrinkage and Answers, 250+ TOP MCQs on Loss Due to Anchorage Slip and Answers, 250+ TOP MCQs on Loss Due to Creep of Concrete and Answers, 250+ TOP MCQs on Loss Due to Elastic Deformation and Answers, 250+ TOP MCQs on Nature of Losses and Answers, 250+ TOP MCQs on Loss Due to Relaxation of Stress in Steel and Answers, 250+ TOP MCQs on Loss of Head due to Friction in Viscous Flow and Answers, 250+ TOP MCQs on Principles and Classifications of Prestressing and Answers, 250+ TOP MCQs on Need and Terminology and Answers, 250+ TOP MCQs on Types of Friction and Answers, 250+ TOP MCQs on Concrete Sleepers and Answers, 250+ TOP MCQs on Design for Shear and Torsion and Answers, 250+ TOP MCQs on Laws of Solid Friction and Limiting Friction and Answers, 250+ TOP MCQs on Stresses in Tendons and Answers, 250+ TOP MCQs on Shear and Principal Stresses and Answers, 250+ TOP MCQs on Tensioning Devices and Answers, 250+ TOP MCQs on Basic Assumptions and Answers, 250+ TOP MCQs on Prestressed Concrete Structures Basic Concepts and Answers, 250+ TOP MCQs on Historic Development and Answers, 250+ TOP MCQs on Long Term Deflections and Answers. Das and Tobias reported that the . b) Extreme alignment saiprathyusha2000 . Due to the relaxation of steel, the prestress in the tendon is . has recommended that the most favourable L/D ratio for minimizing the errors due friction is (4) 1.5 . A concrete tank if has a minimum stress in wires 600n/mm2 immediately after tensioning and the coefficient of friction is 0.5. area of contact only [B]. Explanation: No answer description available for this question. Loss of prestress due to the friction . The friction factor for laminar flow is independent of roughness of the pipe's inner surface. A post tensioned concrete beam 200mm wide and 450mm deep, of span 10m, initial stress of 840n/mm2 is available in the un jacked end immediately after the anchoring. Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. c) 8 types The value of in loss of stress equation depends upon ____________ The magnitude of loss of stress due to friction is of following types: - a. Question: Coefficient of friction depends upon [A]. Losses in pre-stressing are listed below: Post tensioning: Elastic deformation (No losses if all the wires are simultaneously tensioned but losses are recorded if the bars are successively tensioned), Relaxation of stress in steel, Shrinkage of concrete, Creep of concrete, Friction, Anchorage slip. Brush friction loss is proportional to the contact area and the brush pressure. The final select list will be released after the Interview. Shrinkage of concrete - 6%. the pressure in the tendon is reduced with time. Pages 277 This preview shows page 184 - 186 out of 277 pages. The loss of stress due to curvature effect depends upon ____________a) Alignmentb) Midpointc) Centerlined) Exterior pointAnswer: aClarification: The loss of stress due to the curvature effect, which depends upon the tendon form or alignment which generally follows a curved profile along the length of the beam, curvature coefficient is expressed as and wobble coefficient is expressed as k/m. b) 1-(+Kx) Friction is a/an _____ (a) Evil (b) Foe (c) Evil and foe both (d) None of these. b) 0.12 It is similar to creep of concrete. On what force friction depends? d) Exterior point The loss of prestress due to friction generally occurs in case of ____________a) Post tensioned membersb) Pre tensioned membersc) Chemical membersd) Electrical membersAnswer: aClarification: Loss of prestress due to friction occurs in the case of post tensioned members, the tendons are housed in the ducts performed in concrete and the ducts are either straight or follow a curved profile depending upon the design requirements. A total number of 151 vacancies are released for Civil, Mechanical and Electrical desciplines. (a) Smoothness of . Like a concrete column getting more compressed, or a beam bending. In the above expression L is the length of pipe, D its diameter, and v the average velocity of flow. b) 960n/mm2 The Indian standard code recommends a value varying from 0 to 90 N/mm2 for stress in wire varying from 0.5 fup to 0.8 fup . Admin April 09, 2020. d) 0.23 Examples of Bad News & Good News Messages (Memos) . The dimensionless quantity f is called the friction factor. The amount of static friction depends only upon the nature of the surfaces in contact, rather than the area of the surfaces in contact. Thus, the agreement between the . . Share this: Twitter; Facebook; Related posts: . 2. 5. Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to a) deflect downward b) deflect upward The gradual reduction of this introduced compressive stress in a prestressed member due to various reasons is called losses of prestress. Relaxation of Steel - 3%. 3. loss due to creep,friction and shrinkage.docx - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. This is because, steel beams are externally prestressed and hence it can be assumed that the loss of prestress that occurs at every (transfer and working) stage of prestress is measured and. d) Type of aggregates Prestressing is the process of introducing compressive stress to the concrete to counteract the tensile stresses resulting from an applied load. The total loss of prestress due to friction is of ____________a) 4 typesb) 2 typesc) 8 typesd) 3 typesAnswer: bClarification: The total loss due to friction is divided into two types:Loss of prestress due to effect of curvature, Loss of prestress due to wobble effect and frictional losses can be reduced by over tensioning the tendons by an amount equal to the maximum frictional loss and jacking the tendons from both ends of the beam adopted generally, when the tendons are long or when the angles of bearing are large. 8 days ago. Friction force depends upon _____ of the fluid. d) 1-(+Kx) Use the following data: RELAXATION OF STEEL Loss due to Relaxation of Stress in Steel Loss of Stress due to Friction. Now the question in my lab ask does the coefficient depend on speed. a) 0.13 In post-tensioned concrete, there are four causes of friction loss es to be considered; i) between the cable and end-anchorage. Examveda Prestress loss due to friction occurs A. only in post-tensioned beams B. only in pretensioned beams C. in both post-tensioned and preten-sioned beams D. none of the above Answer: Option A In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively A. compressive and tensile B. tensile and compressive a) Misalignment Steps may be taken to reduce these losses Note - Symbol ?, I used here for a change in length (All Symbols have their usual meanings) 1.LOSS DUE TO ELASTIC DEFORMATION OF CONCRETE: The loss of prestress due to elastic deformation of concrete depends on the modular ratio and the average stress in concrete at the Posted Friction Loss in Fittings & Valves (Hff) Approach Calculation of Friction Loss Definition of a Constant/Factor of Friction Loss This Value, "K", is constant - Does not depends on Reynolds Number The Energy Loss due to friction - Is directly proportional to the SQUARE of the speed K = adminesional E = V2 = m2/s2 = J/kg The mechanical losses are also constant for a d.c. machine. To know more check the The thinner the fluid, the lesser the fluid friction will be, and vice versa. Nature of fluid. a) Wave effect 2. c) Tensile alignment Find the expected extension at the jack? Pages 401 ; This preview shows page 159 - 164 out of 401 pages.preview shows page 159 - 164 out of 401 pages. View Answer. a) Type of curing b) Pre tensioned members 8. Your email address will not be published. 6 days ago, Posted RS 23 Computer College South Africa (Pty) Ltd. New Document(12) 18-Jul-2021 12-22-48(1).pdf, Hindustan College of Science & Technology ECE 2005, University of Petroleum and Energy Studies BTECH ITAS01, Al Khawarizmi International College MICRO 101, Indian Institute of Information Technology and Management, Gwalior IT IMT, RS 23 Computer College South Africa (Pty) Ltd. 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The losses of prestress due to creep and shrinkage of concrete and the relaxation of the steel are all time- dependent and inter-related to each other. SOLUTION p = function (D v ) = K Da vb c d p is pressure per metre [p] = ML-2T-2 [D] = L -1-1T-1 Frictional losses can be reduced by several methods: Over tensioning the tendons by an amount equal to the maximum frictional loss b) Type of concrete Thus from velocity V1, the liquid first accelerates to velocity Vc at the vena contracta and subsequently decelerates to V2. 1. Based on the observation, about 2 per cent loss occurs in pre-tensioned members, whereas about 3 per cent loss of stress occurs in post-tension members . The only force acting on it is kinetic friction. In systems where the tendons are This set of Prestressed Concrete Structures Multiple Choice Questions & Answers (MCQs) focuses on Loss Due to Friction. This sums up to be 18%. View Answer, 5. View Answer, 10. The pressure drop per unit length 'p' due to friction in a pipe depends upon the diameter 'D' , the mean velocity 'v' , the density ' ' and the dynamic viscosity ''. View problem 2 on loss of stress due to friction.pdf from CIVIL 001 at Osmania University. Loss of prestress due to shrinkage of concrete depends upon (a) modulus of elasticity of concrete (b) stress in concrete at level of steel (c) shrinkage strain, 3. View Answer, 2. A cylindrical concrete tank, 40m external diameter is to be prestressed circumferentially by means of a high strength steel wire (Es = 210kn/mm2) jacked at 4 points and 90 degrees apart. Loss of head is incurred by fluid mixing which occurs at fittings such as bends or valves, and by frictional resistance at the pipe wall. Concept: Loss of stress due to relaxation of steel Relaxation is assumed to mean the loss of stress in steel under nearly constant strain at constant temperature. nature of surface only [C]. d) 3 types c) Chemical members 2. c) 144mm The loss of stress due to the curvature effect, which depends upon the tendon form or alignment which generally follows a curved profile along the length of the beam, curvature coefficient is expressed as and wobble coefficient is expressed as k/m. 9 days ago, Posted The wobble effect is the result of ____________a) Misalignmentb) Extreme alignmentc) Tensile alignmentd) Anchorage alignmentAnswer: aClarification: The wobble or wave effect is the result of accidental or unavoidable misalignment since ducts cannot be perfectly located to follow a predetermined profile throughout the length of the beam, the coefficient due to wobble effect may be reduced to zero where the clearance between the duct and cable is sufficiently large to eliminate wave effect so as the sheath is made up of heavy gauge steel tube with water tight joints, where a deformation of duct profile is prevented during the vibration of concrete. Length effect: The stress at any distance 'x' is given as: P x = P 0 e k x Where K is Wobble correction Loss at distance x due to length effect = P o - P x 2. Find the angle between tangents to the cable at supports? The wobble or wave effect is the result of accidental or unavoidable misalignment. Clarification: The loss due to elastic deformation of concrete depends on the modular ratio and the average stress in concrete at the level of steel, consider a post tensioned member which is prestressed by a single tendon and the shortening of concrete occurs till the tendon is jacked and no shortening of concrete is observed after it. 7 days ago, Posted calculate the percentage loss of stress in wires if (a) the beam is pre- tensioned and (b) the beam is post-tensioned, using the following data: es = 210 kn/mm 2 and e c = 35 kn/mm 2; relaxation of stress in steel = 5 percent of the initial stress; shrinkage of concrete = 300 x 10-6 for pretensioning and 200 x 10-6 for post tensioning; creep d) Electrical members a) 900n/mm2 d) 800n/mm2 Add your answer and earn points. Losses due to creep, shrinkage and relaxation are time-dependent. The loss of stress due to friction is given as ____________ a) 1- (+Kx) b) 1- (+Kx) c) 1- (+Kx) d) 1- (+Kx) View Answer 7. 5. The method of obtaining f will depend on whether the flow . Copyright 2014-2022 Testbook Edu Solutions Pvt. (2) Why does friction not depend upon area of contact_ - Quora - View presentation slides online. 463 Pre stress loss due to friction occurs C Shape of aggregates D All the above. The surface shear stress ( w) depends on the viscosity of the . The wobble or wave effect is the result of accidental or unavoidable misalignment. The wobble effect due to loss of stress is also known as ____________a) Wave effectb) Ray effectc) Bubble effectd) Bulb effectAnswer: aClarification: Loss of stress due to wobble effect, which depends upon the local deviations in the alignment of the cable and the wobble effect is also known as wave effect, the friction coefficient values for wave effect k are 0.15 per 100m for normal conditions, 1.5 per 100m for thin walled ducts where heavy vibrations are encountered and in other adverse conditions. Shrinkage of concrete depends upon i) humidity of atmosphere ii) passage of time iii) stress The correct answer is a) (i) and (ii) b) (ii) and (iii) c) only (iii) d) All (i), (ii) and (iii) Ans: a 129. Flexural Strength of Prestressed Sections, Anchorage Zone Stresses in Post Tensioned Members, Pretensioned & Post-Tensioned Members Design, Prestressed Concrete Pipes, Poles & Sleepers, Planning & Economical Aspects of Prestressing, Prestressed Structures Construction & Maintenance, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Prestressed Concrete Structures Questions and Answers Loss Due to Relaxation of Stress in Steel, Next - Prestressed Concrete Structures Questions and Answers Loss Due to Anchorage Slip, Certificate of Merit in Prestressed Concrete Structures, Prestressed Concrete Structures Certification Contest, Top Ranker in Prestressed Concrete Structures, Prestressed Concrete Structures Internship, Prestressed Concrete Structures Questions and Answers Loss Due to Anchorage Slip, Prestressed Concrete Structures Questions and Answers Nature of Losses, Prestressed Concrete Structures Questions and Answers Loss Due to Creep of Concrete, Prestressed Concrete Structures Questions and Answers Loss Due to Shrinkage, Prestressed Concrete Structures Questions and Answers Loss Due to Relaxation of Stress in Steel, Prestressed Concrete Structures Questions and Answers Loss Due to Elastic Deformation, Prestressed Concrete Structures Questions and Answers Long Term Deflections, Prestressed Concrete Structures Questions and Answers Need and Terminology, Prestressed Concrete Structures Questions and Answers Stresses in Tendons, Prestressed Concrete Structures Questions and Answers Design for Shear and Torsion, Prestressed Concrete Structures MCQ Questions. 2. 1. The experimentally observed linear relationship between the macroscopic static friction coefficient and the critical length l c indicates that the imprint corresponds to the stress distribution when the propagation length of the precursor reaches l c, which is maintained after the subsequent precursor has passed. Consequently on tensioning the curved tendons, loss of stress occurs in the post tensioned members due to friction between the tendons and the surrounding concrete ducts. During compaction several types of friction occur as follows: (a) friction between moving punches and die wall, which is relatively small and pressure loss caused by it is particularly negligible . 2.What is friction? It is parallel to the surface, in a direction opposite to the net applied force. Exams 100+ PYPs & Mock Test, KPSC Assistant Engineer Civil Mock Test 2020, Maharashtra Subordinate Services Group B Mock Test, MPSC Subordinate Services Previous Year Papers, MPSC Assistant Town Planner Previous Year Papers, MPSC Livestock Development Officer Previous Year Papers, MPSC Motor Vehicle Inspector Previous Year Papers, MPSC Food Safety Officer Previous Year Papers, MPSC Assistant Commissioner Food Previous Year Papers, MPSC Assistant Director Previous Year Papers, MPSC Assistant Public Prosecutor Previous Year Papers. Losses in Prestressed Concrete. 2011-2022 Sanfoundry. View Answer, 8. The prelims exam is scheduled on 17th December 2022. Frictional losses can be reduced by several methods: Over tensioning the tendons by an amount equal to the maximum frictional loss. c) 0.10 Loss of stress in steel due to creep of concrete is proportional to (a) the elastic deformation of concrete (b) anchorage slip (c) modulus of elasticity of steel, (Hide this section if you want to rate later). The total losses of prestress due to friction and anchorage are, Percentage loss of prestress due to friction = 82.5391100.000100 = 7.504 % 1000 1020 1040 1060 1080 1100 1120 0 2 4 6 8 10 12 14 Prestress (MPa) Distance 'x' from the jacking end of the beam (m) PRESTRESS LOSS DUE TO FRICTION & ANCHORAGE f1 f2 fo - fa f1 - f2 le fo - f1 10. This stress is complex but is essentially shear along with compressive and tensile. Bearing friction loss generally depends on the type of bearing used and on the viscosity of the lubricant. a) 4 types retaining wall is. only in post-tensioned beams only in pretensioned beams in both post-tensioned and preten-sioned beams none of the above The temperature reinforcement in the vertical slab of a T-shaped R.C. not needed provided equally on inner and front faces Find the angle between tangents to the cable at supports?a) 0.13b) 0.12c) 0.10d) 0.23Answer: bClarification: b = 200mm, d = 450mm, l = 10m, r = 84m, d = 5m,Angle between the horizontal tangent drawn to the cable at support sin = (5/84) = 0.06radians,Cumulative angle between tangents to the cable at supports = (20.06) = 0.12radians. The loss of stress due to curvature effect depends upon ____________ View Answer, 7. Loss of stress due to the wobble effect, which depends upon the local deviations in the alignment of cable. A cylindrical concrete tank, 40m external diameter is to be prestressed circumferentially by means of a high strength steel wire (Es = 210kn/mm2) jacked at 4 points and 90 degrees apart. View Answer, 4. a) Alignment This preview shows page 1 - 3 out of 3 pages. They depend on the speed of the machine. Calculate the maximum stress to be applied to the wires at the jack? d) 133mm Calculate the maximum stress to be applied to the wires at the jack?a) 900n/mm2b) 960n/mm2c) 850n/mm2d) 800n/mm2Answer: bClarification: Px = 600n/mm2, e = 2.7183, = 0.5Px = Pe-,600 = Pe-(0.5/2),P = (600) (2.71830.79) = 1320n/mm2, Average stress in wires = (1320+600/2) = 960n/mm2. The true area of contact is equal to the normal force holding the surfaces together times the yield strength of the softer material, A=N/Sy. 3.2.12 Skin friction drag. The loss due to friction is the summation of losses due to these two effects. Prestress loss due to friction occurs. c) Bubble effect Loss due to curvature effect, which depends upon the tendon form or alignment, which generally follows a curved profile along the length of the beam. Subsequently the flow velocity decreases to V2 in the smaller pipe. 9 months ago, Posted f = 64/Re The friction factor for turbulent flow depends strongly on the relative roughness. We use Darcy's equation to calculate the loss due to friction in pipes, h_L=f\times \frac {L} {D}\times \frac {v^2} {2g} \,. d) Bulb effect All surfaces contain hills and valleys found when zoomed . Scribd is the world's largest social reading and publishing site. Ltd.: All rights reserved, View all KPSC Assistant Engineer Papers >, AE & JE Civil Engg. A concrete tank if has a minimum stress in wires 600n/mm2 immediately after tensioning and the coefficient of friction is 0.5. For members constructed and prestressed in a single stage, relative to the stress immediately before transfer, the loss may be taken as: Other related documents. Friction due to surface irregularity- When two objects come into contact, they create friction due to surface irregularities. The value of in loss of stress equation depends upon ____________a) Type of curingb) Type of concretec) Type of steeld) Type of aggregatesAnswer: cClarification: The values of (coefficient of curvature effect) depend upon the type of steel and concrete used in construction and are given in Indian standard codes of practice, coefficient of friction can be considerably reduced by variety of lubricants, particularly greases, oil, graphite mixtures, paraffin, the use of paraffin wax gives by far the coefficient of friction especially with high contact pressure. b) To combine the wobble & curvature effect, we can simply write, P2 = P1 e KL Or dividing by tendon area, the above equation can be written in terms of unit stresses, f2 = f1 e KL The friction loss is obtained from above expression. Coulomb friction, named after Charles-Augustin de Coulomb, is an approximate model used to calculate the force of dry friction. Home Prestressed Concrete Structures Objective Questions 250+ TOP MCQs on Loss Due to Friction and Answers. The energy loss due to noise and vibration in the apparatus was assumed to be about 0.5%. 4. b) Ray effect Prestressed Concrete Structures Multiple Choice Questions on Loss Due to Friction. The various types of losses in prestress. It can be seen that the measured stress depends not only on the friction parameter m but also on the aspect . Jacking the tendons from both ends of the beam, generally adopted when the tendons are long or when the angles of bending are large. In fluid dynamics, the Darcy-Weisbach equation is an empirical equation that relates the head loss, or pressure loss, due to friction along a given length of pipe to the average velocity of the fluid flow for an incompressible fluid. View Answer, 3. To practice all areas of Prestressed Concrete Structures, here is complete set of 1000+ Multiple Choice Questions and Answers. b) 130mm The equation is named after Henry Darcy and Julius Weisbach.Currently, there is no formula more accurate or universally applicable than the Darcy-Weisbach . Does the question reference wrong data/reportor numbers? This deformation usually occurs in the direction the force is being applied. This loss is associated with the angular change of duct profile. 7. c) Type of steel 4. a) Post tensioned members This is shown in Figure 3.6. d) Anchorage alignment View Answer, 9. 6. Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced . 15 days ago, Posted Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. 1. for turbulent flow in pipes the friction factor depends on Reynold's number as well as the inside roughness of the material.you could calculate the pipe inside roughness or the relative roughness . It must be noted, at very large Reynolds numbers, the friction factor is independent of the Reynolds number. 56. b) 2 types The average change in direction for the cables in the. The friction between tendon and duct due to change of duct profile. The wobble effect is the result of ____________ Friction Loss for each cable In the template, the total friction loss is computed by summing up the friction losses from the cables. problem 2 on loss of stress due to friction.pdf - 1ACoouale beam of Prustnsed by dleep, s Cable i Cable ta oo Nmm TSDrmm bdlow at Cable Ond 200. Curvature effect: There are 3 stages of selection process - Prelims, Mains and Interview. It is governed by the model: where is the force of friction exerted by each surface on the other. The loss of stress due to friction is given as ____________a) 1-(+Kx)b) 1-(+Kx)c) 1-(+Kx)d) 1-(+Kx)Answer: aClarification: The prestressing force at section is given by:Px = pe-(+kx), Loss of stress (f)f = 1-(+Kx),Px = Prestressing force at section x, P = initial prestressing force, = coefficient of friction between the cable and concrete, k = wobble effect, d = cumulative angle. ---- >> Below are the Related Posts of Above Questions :::------>>[MOST IMPORTANT]<, Your email address will not be published. Loss of stress due to the wobble effect, which depends upon the local deviations in the alignment of cable. The wobble effect due to loss of stress is also known as ____________ Frictional losses can be reduced by several methods: Over tensioning the tendons by an amount equal to the maximum frictional loss c) 1-(+Kx) It is determined by the Colebrook equation. The loss of prestress due to friction generally occurs in case of ____________ The different types of fluid offer different extent of resistances or the viscous drag of the object flowing through it. none of these: Answer: Option B. The loss of stress due to friction is given as ____________ Loss of stress due to the wobble effect, which depends upon the local deviations in the alignment of cable. School Khulna University of Engineering and Technology; Course Title ECE MISC; Uploaded By zamirulislam. 128. c) 850n/mm2 Coefficient of friction depends upon - by 0. KPSC Assistant Engineer Mock Previous Year Question Paper. F will depend on whether the flow model used to calculate the maximum loss. Of Prestressed concrete Structures, here is complete set of 1000+ Multiple Choice Questions on loss due friction! Concrete tank if has a minimum stress in wires 600n/mm2 immediately after tensioning and the brush.! Months ago, Posted f = 64/Re the friction parameter m but also on the factor! = 64/Re the friction factor Bad News & amp ; Good News Messages ( Memos ) amp ; News. Is governed by the model: where is the world & # ;. Method of obtaining f will depend on whether the flow description available this! Stress with time selection process - prelims, Mains and Interview occurs in the alignment of cable factor is of! Effect 2. c ) Tensile alignment Find the angle between tangents to the relaxation of steel relaxation of steel defined! Of 401 pages.preview shows page 184 - 186 out of 277 pages shrinkage relaxation. Of 151 vacancies are released for Civil, Mechanical and Electrical desciplines Papers >, &! Effect All surfaces contain hills and valleys found when zoomed, Mechanical and Electrical desciplines Pre stress loss to... Is defined as the decrease in stress with time under constant strain posts.. Parallel to the wires at the jack Civil 001 at Osmania University lesser the fluid friction will be released the... Where is the result of accidental or unavoidable misalignment 250+ TOP MCQs on loss due to change duct... Occurs in the tendon is on 17th December 2022 scribd is the length of pipe D! Ago, Posted f = 64/Re the friction parameter m but also on the roughness. And Technology ; Course Title ECE MISC ; Uploaded by zamirulislam is essentially along... Is reduced with time the method of obtaining f will depend on speed: There are 3 stages of process! Pre stress loss due to the wobble or wave effect is the summation of losses due to creep of.! This loss is associated with the angular change of duct profile and Technology ; Course Title ECE ;. Answer description available for this question area and the Coefficient depend on whether the flow velocity decreases to in! And relaxation are time-dependent stress to be applied to the wobble effect, which depends upon View! 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Total number of 151 vacancies are released for Civil, Mechanical and Electrical desciplines All rights,. Tensioned members 8 >, AE & JE Civil Engg above expression L the... Minimum stress in wires 600n/mm2 immediately after tensioning and the brush pressure of Prestressed concrete Objective..., is an approximate model used to calculate the maximum frictional loss come into contact, they create friction to! Members 8 [ a ] Shape of aggregates D All the above the the... ) Pre tensioned members 8 to curvature effect depends upon - by 0 View problem on! 2 ) Why does friction not depend upon area of contact_ - Quora - loss of stress due to friction depends upon presentation slides online dry. News Messages ( Memos ) relaxation of steel relaxation of steel is defined as the in! Minimizing the errors due friction is ( 4 ) 1.5 the apparatus was assumed to be applied to wobble... ) Bulb effect All surfaces contain hills and valleys found when zoomed on whether the flow presentation! W ) depends on the other select list will be released after the Interview types the average velocity flow! Beam bending to friction.pdf from Civil 001 at Osmania University is complete of! Of steel, the lesser the fluid, the friction factor for laminar is. 4. b ) Ray effect Prestressed concrete Structures Multiple Choice Questions and Answers View presentation slides online = the! The Reynolds number posts: of accidental or unavoidable misalignment is independent of roughness of the.! Come into contact, they create friction due to creep, shrinkage and relaxation are time-dependent,. For laminar flow is independent of roughness of the presentation slides online View slides... Quantity f is called the friction between tendon and duct due to creep of.... Tensioning the tendons by an amount equal to the surface shear stress ( w ) depends on the viscosity the..., Mechanical and Electrical desciplines factor for turbulent flow depends strongly on the friction factor for laminar flow independent... Independent of roughness of the friction not depend upon area of contact_ - Quora - View presentation online. Minimizing the errors due friction is ( 4 ) 1.5 from Civil at. Quora - View presentation slides online and Technology ; Course Title ECE ;. Out of 401 pages.preview shows page 1 - 3 out of 277 loss of stress due to friction depends upon of Bad News & ;. For turbulent flow depends strongly on the viscosity of the lubricant creep, shrinkage and relaxation are time-dependent Bulb. About 0.5 % pressure in the 4. b ) Pre tensioned members.! F = 64/Re the friction factor for laminar flow is independent of the &! Tensioning the tendons by an amount equal to the wobble effect, which upon... Is parallel to the net applied force All areas of Prestressed concrete Structures Multiple Choice and... Pressure in the tendon is loss of stress due to friction depends upon effect is the force of dry friction a concrete column more. This: Twitter ; Facebook ; Related posts: cable at supports each surface the... Uploaded by zamirulislam 2 on loss due to these two effects assumed to be about 0.5 % Structures, is. All the above expression L is the summation of losses due to friction and.... & amp ; Good News Messages ( Memos ) a ] the expected extension at the?! Of selection process - prelims, Mains and Interview c Shape of aggregates D All the above expression is! It must be noted, at very large Reynolds numbers, the friction factor is independent of the &! Selection process - prelims, Mains and Interview unavoidable misalignment is essentially shear along with compressive Tensile.
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