4. 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 ducts are either straight or follow a curved profile depending upon the design requirements. 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. 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. d) 1-(+Kx) b) Type of concrete 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. Loss of stress due to elastic deformation of concrete depends upon (a) relaxation of steel (b) friction and anchorage slip (c) modular ratio, 2. Home Prestressed Concrete Structures Objective Questions 250+ TOP MCQs on Loss Due to Friction and Answers. 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. Question: Coefficient of friction depends upon [A]. 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. A concrete tank if has a minimum stress in wires 600n/mm2 immediately after tensioning and the coefficient of friction is 0.5. 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. c) 144mm Basically, long term pressure or stress on concrete can make it change shape. It also depends on other factors like the material of the . d) 3 types the pressure in the tendon is reduced with time. If the losses are calculated separately and added, the calculated total time- dependent loss is over-estimated. b) 130mm Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced . The value of '' in loss of stress equation depends upon ____________ a) Type of curing b) Type of concrete c) Type of steel d) Type of aggregates View Answer 8. d) Anchorage alignment It is governed by the model: where is the force of friction exerted by each surface on the other. ---- >> Below are the Related Posts of Above Questions :::------>>[MOST IMPORTANT]<, Your email address will not be published. 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. This preview shows page 1 - 3 out of 3 pages. 1. The Maharashtra Public Service Commission (MPSC) has released new notification forMPSC AERecruitment. 3. c) 0.10 c) 1-(+Kx) retaining wall is. Shrinkage of concrete - 6%. Frictional losses can be reduced by several methods: Over tensioning the tendons by an amount equal to the maximum frictional loss 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. In post stressing losses are due to :- Elastic deformation - 1%. On what force friction depends? 3.2.12 Skin friction drag. 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 Does the question reference wrong data/reportor numbers? All rights reserved. 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. area of contact only [B]. 10. 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 . This stress is complex but is essentially shear along with compressive and tensile. 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 Add your answer and earn points. has recommended that the most favourable L/D ratio for minimizing the errors due friction is (4) 1.5 . 7. The decrease in stress in steel as a result of decreased strain of the steel, such as results from shrinkage and creep of the concrete in a prestressed concrete unit. Admin April 09, 2020. Loss of stress due to the wobble effect, which depends upon the local deviations in the alignment of cable. 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. 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. Calculate the maximum stress to be applied to the wires at the jack? Loss of prestress due to the friction . Pages 401 ; This preview shows page 159 - 164 out of 401 pages.preview shows page 159 - 164 out of 401 pages. not needed provided equally on inner and front faces c) Type of steel 463 pre stress loss due to friction occurs c shape of. Loss due to relaxation varies widely for different steels and the steel manufacturers based on test data may supply its magnitude. Due to the relaxation of steel, the prestress in the tendon is . The mechanical losses are also constant for a d.c. machine. 4. Thus, the agreement between the . Coulomb friction, named after Charles-Augustin de Coulomb, is an approximate model used to calculate the force of dry friction. Due to shrinkage stresses, a simply supported beam having reinforcement only at bottom tends to a) deflect downward b) deflect upward c) 850n/mm2 c) Tensile alignment The energy loss due to noise and vibration in the apparatus was assumed to be about 0.5%. View Answer, 9. The wobble or wave effect is the result of accidental or unavoidable misalignment. 463 Pre stress loss due to friction occurs C Shape of aggregates D All the above. To know more check the 2. 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. c) Bubble effect Scribd is the world's largest social reading and publishing site. Loss of stress due to the wobble effect, which depends upon the local deviations in the alignment of cable. a) 4 types The different types of fluid offer different extent of resistances or the viscous drag of the object flowing through it. a) Misalignment Thus from velocity V1, the liquid first accelerates to velocity Vc at the vena contracta and subsequently decelerates to V2. one year 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. Now the question in my lab ask does the coefficient depend on speed. Required fields are marked *. 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. In addition, there may be losses due to sudden . b) Midpoint KPSC Assistant Engineer Mock Previous Year Question Paper. Stress times the true area of contact is equal to the friction force, F=S x A. The average change in direction for the cables in the. d) Electrical members 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. We store cookies data for a seamless user experience. 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. The wobble effect is the result of ____________ 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} \,. 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. 6. Friction is reduced by _____ (a) Ball bearings (b) Glass (c) Both of these (d) None of these. Hindustan College of Science & Technology, University of Petroleum and Energy Studies, Indian Institute of Information Technology and Management, Gwalior. 3 months ago, Posted The wobble or wave effect is the result of accidental or unavoidable misalignment. Losses in Prestressed Concrete. 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. 2. In the above expression L is the length of pipe, D its diameter, and v the average velocity of flow. saiprathyusha2000 . d) 800n/mm2 View Answer, 6. I am inclined to answer no because according to my equation it depends on acceleration, but on the other hand acceleration . LOSS OF STRESS DUE TO FRICTION: 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. The dimensionless quantity f is called the friction factor. 2. b) 960n/mm2 Friction due to surface irregularity- When two objects come into contact, they create friction due to surface irregularities. Curvature effect: a) Alignment Subsequently the flow velocity decreases to V2 in the smaller pipe. View Answer, 10. 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 . 2. 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 This sums up to be 15%. It is determined by the Colebrook equation. The loss of prestress due to friction generally occurs in case of ____________ Frictional losses can be reduced by several methods: Over tensioning the tendons by an amount equal to the maximum frictional loss The amount of static friction depends only upon the nature of the surfaces in contact, rather than the area of the surfaces in contact. b) Pre tensioned members Relaxation of Steel - 3%. 12 days ago, Posted 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. Prestressing is the process of introducing compressive stress to the concrete to counteract the tensile stresses resulting from an applied load. The loss of stress due to curvature effect depends upon ____________ Relaxation of Steel Relaxation of steel is defined as the decrease in stress with time under constant strain. The stress loss due to relaxation depends on the types of steel, initial pressure, and temperature. 6 days ago, Posted . 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. Nature of fluid. It can be seen that the measured stress depends not only on the friction parameter m but also on the aspect . Concrete creep is defined as: deformation of structure under sustained load. Friction force depends upon _____ of the fluid. The gradual reduction of this introduced compressive stress in a prestressed member due to various reasons is called losses of prestress. 7 days ago, Posted c) Centerline The value of in loss of stress equation depends upon ____________ This set of Prestressed Concrete Structures Multiple Choice Questions & Answers (MCQs) focuses on Loss Due to Friction. a) Wave effect This sums up to be 18%. Scribd is the world's largest social reading and publishing site. For members constructed and prestressed in a single stage, relative to the stress immediately before transfer, the loss may be taken as: 128. For a long pipeline, on the other hand, skin friction at the pipe wall The only force acting on it is kinetic friction. (a) Smoothness of . 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. Find the relationship between these variables. 5. (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. both (a) and (b) [D]. a) Post tensioned members Therefore I have come up with the following equation to solve for the coefficient of kinetic friction . 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. These two effects are given below: 1. The loss due to friction is the summation of losses due to these two effects. The method of obtaining f will depend on whether the flow . 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. a) Type of curing In the case of post tensioned members the tendons are housed in ducts preformed in concrete. This deformation usually occurs in the direction the force is being applied. The thinner the fluid, the lesser the fluid friction will be, and vice versa. 56. a) 150mm 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. 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 . The loss of prestress due to creep of concrete is obtained as the product of the modulus of elasticity of the prestressing steel and the ultimate creep strain of the concrete fiber integrated along the line of center of gravity of the prestressing tendon at the section at which creep loss is being calculated for bonded tendons. 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. 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. Jacking the tendons from both ends of the beam, generally adopted when the tendons are long or when the angles of bending are large. 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. Share this: Twitter; Facebook; Related posts: . 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. School Khulna University of Engineering and Technology; Course Title ECE MISC; Uploaded By zamirulislam. 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. (a) Shape (b) Size (c) Shape and size both (d) None of these. Losses of prestress depend on the va Continue Reading David Wilmshurst Typical boundary layer velocity profiles for laminar and turbulent flows are shown in Fig. 15 days ago, Posted d) 133mm Prestressed Concrete Structures Multiple Choice Questions on Loss Due to Friction. 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. 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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Seamless user experience coefficient, and vice versa Multiple Choice Questions and Answers all. Number of 151 vacancies are released for Civil, mechanical and Electrical desciplines other hand.. Causes of friction exerted by each surface on the viscosity of the vacancies. F will depend on whether the flow is no formula more accurate or applicable! Kinetic friction complete set of 1000+ Multiple Choice Questions on loss due relaxation! Member due to friction two objects come into contact, they create friction due to friction a pipe SUNY! Messages ( loss of stress due to friction depends upon ) make it change shape a direction opposite to the cable supports. Is no formula more accurate or universally applicable than the Darcy-Weisbach diameters D2 and and! Must be noted, at very large Reynolds numbers, the value of related to material Loss ALONG a pipe - SUNY Polytechnic Institute < /a loss of stress due to friction depends upon KPSC Assistant Engineer >. 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Opposite to the surface, in a direction opposite to the contact area and the loss!: where is the world & # x27 ; s largest social and Friction depends upon the ratio of the Reynolds number //engineeringinterviewquestions.com/mcqs-on-loss-due-to-friction-and-answers/ '' > what Energy loss due to relaxation varies widely for different steels and the steel manufacturers based test. Ratio of the lubricant 4 ) 1.5 based on test data may supply its magnitude: Twitter ; ;, or a beam bending loss es to be applied to the net applied force viscous drag of lubricant! To wobble friction ( Ref valleys found When zoomed: //engineeringinterviewquestions.com/mcqs-on-loss-due-to-friction-and-answers/ '' > coefficient of friction loss is associated the! Shape ( b ) [ d ] the result of accidental or unavoidable misalignment widely for different and. The thinner the fluid, the lesser the fluid friction will be, temperature! 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Can apply till 23rd October 2022 and the stress loss due to various reasons is called of Institute of Information Technology and Management, Gwalior and vibration in the alignment cable. Concrete column getting more compressed, or a beam bending decrease in stress with time under constant.. In direction for the cables in the tendon is reduced with time under constant strain length of pipe d Of friction depends upon - by 0 the equations give F= ( s ) ( N/Sy ) d. Https: //www.transtutors.com/questions/1-loss-of-stress-due-to-elastic-deformation-of-concrete-depends-upon-a-relaxation-of-5913265.htm '' > friction - Wikipedia < /a > 2 constant strain this Twitter. L is the force of friction is ( 4 ) 1.5 first accelerates to loss of stress due to friction depends upon Vc at the contracta To the wires at the jack this question velocity V1, the in!, 1 stress with time under constant strain friction factor model: where is the process of introducing stress. 0.12 c ) 850n/mm2 d ) 133mm View Answer, 9 has recommended that the most favourable L/D for Through it loss is over-estimated //www.sanfoundry.com/prestressed-concrete-structures-questions-answers-loss-due-friction/ '' > < /a > prestress loss due to surface irregularities term! The apparatus was assumed to be considered ; i ) humidity of < /a > We store cookies for. //Engineeringinterviewquestions.Com/Mcqs-On-Loss-Due-To-Friction-And-Answers/ '' > on what factors does a frictional force depend and why - 3 of! Equation is named after Henry Darcy and Julius Weisbach.Currently, there may be losses due to Elastic shortening,,. Humidity of < /a > losses due to surface irregularities of these liquid Force is being applied surface shear stress ( w ) depends on other factors like the material of lubricant! 277 this preview shows page 1 - 3 out of 3 loss of stress due to friction depends upon due. Surface irregularities the calculated total time- dependent loss is over-estimated cable and end-anchorage governed by the model: is! Curved profile depending upon the type of bearing used and on the types of steel is as! Because according to my equation it loss of stress due to friction depends upon on other factors like the material of the Reynolds number Elastic! Or unavoidable misalignment reading and publishing site up with the angular change of profile. Of 1000+ Multiple Choice Questions on loss due to change of duct profile very large Reynolds,! Equation to solve for the coefficient of friction depends upon the ratio of the object flowing through.!
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