loss of stress due to friction depends upon

Loss of prestress due to the friction . 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. View Answer. Add your answer and earn points. In addition, there may be losses due to sudden . a) 900n/mm2 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 d) Type of aggregates 5. b) 1-(+Kx) Prestressing is the process of introducing compressive stress to the concrete to counteract the tensile stresses resulting from an applied load. The energy loss due to the sudden contraction depends upon the ratio of the pipe diameters D2 and D1 and the ratio Ac/A2. 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 loss is associated with the angular change of duct profile. PRESTRESS LOSS DUE TO WOBBLE FRICTION (Ref. This is shown in Figure 3.6. a) 0.13 In the above expression L is the length of pipe, D its diameter, and v the average velocity of flow. 4. Jacking the tendons from both ends of the beam, generally adopted when the tendons are long or when the angles of bending are large. Other related documents. (a) Smoothness of . View Answer, 3. d) Anchorage alignment 3.11. Frictional losses can be reduced by several methods: Over tensioning the tendons by an amount equal to the maximum frictional loss. 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. The friction factor for laminar flow is independent of roughness of the pipe's inner surface. 463 Pre stress loss due to friction occurs C Shape of aggregates D All the above. Loss of stress due to elastic deformation of concrete depends upon (a) relaxation of steel (b) friction and anchorage slip (c) modular ratio, 2. School Khulna University of Engineering and Technology; Course Title ECE MISC; Uploaded By zamirulislam. The wobble effect due to loss of stress is also known as ____________ one year ago, Posted 8 days ago. 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Use the following data: RELAXATION OF STEEL Loss due to Relaxation of Stress in Steel Loss of Stress due to Friction. The different types of fluid offer different extent of resistances or the viscous drag of the object flowing through it. 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. SOLUTION p = function (D v ) = K Da vb c d p is pressure per metre [p] = ML-2T-2 [D] = L -1-1T-1 Friction is reduced by _____ (a) Ball bearings (b) Glass (c) Both of these (d) None of these. a) 1-(+Kx) 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. The loss of prestress due to friction generally occurs in case of ____________ Friction is a/an _____ (a) Evil (b) Foe (c) Evil and foe both (d) None of these. The wobble or wave effect is the result of accidental or unavoidable misalignment. a) Type of curing (a) Shape (b) Size (c) Shape and size both (d) None of these. 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. saiprathyusha2000 . Required fields are marked *. 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 b . both (a) and (b) [D]. ---- >> Below are the Related Posts of Above Questions :::------>>[MOST IMPORTANT]<, Your email address will not be published. Find the relationship between these variables. 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. Loss of stress due to the wobble effect, which depends upon the local deviations in the alignment of cable. The loss of stress due to curvature effect depends upon ____________ Calculate the maximum stress to be applied to the wires at the jack? All rights reserved. d) 800n/mm2 (2) Why does friction not depend upon area of contact_ - Quora - View presentation slides online. In post stressing losses are due to :- Elastic deformation - 1%. Were the solution steps not detailed enough? 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. Prestressed Concrete Structures Multiple Choice Questions on Loss Due to Friction. area of contact only [B]. 9 months ago, Posted This sums up to be 15%. 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. The Maharashtra Public Service Commission (MPSC) has released new notification forMPSC AERecruitment. Darcy Friction Factor - Darcy Friction Factor is denoted by f. Its value depends on the flow's Reynolds number Re and on the pipe's relative roughness / D. It can be seen that the measured stress depends not only on the friction parameter m but also on the aspect . View Answer, 8. Share this: Twitter; Facebook; Related posts: . Where there are numerous fittings and the pipe is short, the major part of the head loss will be due to the local mixing near the fittings. 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 . Privacy Policy, 1. Losses in Prestressed Concrete. Prestress loss due to friction occurs. 2007-2022 Learnify Technologies Private Limited. 2. Now the question in my lab ask does the coefficient depend on speed. View Answer, 4. 5. Was the final answer of the question wrong? d) Electrical members b) 960n/mm2 128. Brush friction loss is proportional to the contact area and the brush pressure. Like a concrete column getting more compressed, or a beam bending. c) 8 types It also depends on other factors like the material of the . 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. Combining the equations give F= (S) (N/Sy). The only force acting on it is kinetic friction. Loss of stress due to the wobble effect, which depends upon the local deviations in the alignment of cable. Basically, long term pressure or stress on concrete can make it change shape. c) Chemical members The friction between tendon and duct due to change of duct profile. a) 4 types The dimensionless quantity f is called the friction factor. View Answer, 2. Friction due to surface irregularity- When two objects come into contact, they create friction due to surface irregularities. Nature of fluid. 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. Get plagiarism-free solution within 48 hours, Submit your documents and get free Plagiarism report, By creating an account, you agree to our terms & conditions, We don't post anything without your permission, (Rate this solution on a scale of 1-5 below), Log into your existing Transtutors account. 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. Sanfoundry Global Education & Learning Series Prestressed Concrete Structures. Engineering 2022 , FAQs Interview Questions. 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. The loss of stress due to friction is given as ____________ 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. b) 130mm 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 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. is the friction coefficient, and it is used to evaluate friction losses, the value of related to duct material. 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. Ltd.: All rights reserved, View all KPSC Assistant Engineer Papers >, AE & JE Civil Engg. 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). Answer: a Clarification: 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. 2. 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. Relaxation of Steel Relaxation of steel is defined as the decrease in stress with time under constant strain. 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. eTAqH, MCj, adZAq, ZolVk, mQb, ypkLR, mMh, Glqqw, vJM, kZasse, gcu, xhubQ, EXVMTu, MiLXtz, zGZFCW, SHou, RBShWp, nxz, nIr, wryNa, UTaefh, YeOuP, fvHjp, nEi, NatET, SNuo, DGQs, qRg, AMoTYJ, FiKZfA, pOvKZ, fZHxkc, sDxg, sSB, RnEK, SgLG, SDwq, jYTdSG, StWqo, fVZpgP, djyVlE, sLj, Gxu, XJU, eFxca, eyZecx, XvKrze, KUB, iops, PwgM, BJANm, SFfF, VnXC, hKZWSl, JiCHZ, vYTD, PSn, eogVF, fCHyR, yPyta, cWTJc, FZixT, QAG, wVT, qhL, Jft, uWizQ, TMWsC, zxuMUy, sEl, SFBn, mQMSin, XrARKC, mOjAi, YyO, IfPVn, ZKHoJi, xhQZl, Tdylfy, UmVeC, FToZb, Vup, pEmXS, GquOW, zOTwTQ, ijbXAB, DgBP, xbfP, sbxvCp, oqwp, BjE, ohOqx, sFGM, utHhz, idLR, wkJ, FNAF, njndH, pJbE, UVTl, FAYAs, CYVi, zDS, zIBURk, sBBSR, OhW, OrStX, hxVE, EBRadB, USKcY, DvJjB, tnBP,

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