ultimate limit state design of prestressed concrete beams

... strengthening efficiency of UPC beams as compared to that of UPC beams [6,28,29] The lack of researches on BPC beams strengthened with CFRP sheets could be the reason there is a lack of design provisions ... the range of 3 to 3.5 GPa The mechanical properties of concrete, tendons, CFRP sheets, and rebar are presented in Table2 Table 1 Concrete mix design Table 2 Mechanical properties of concrete, ... These beams were designed to analyze the effect of the decrease of prestressing force on flexural behavior of UPC beams strength-ened with CFRP sheets, corresponding to three reduction levels of

Ngày tải lên: 05/07/2022, 11:23

... DEPARTMENT OF TRANSPORT Design of concrete bridges: use of BS 5400: Part4: 1984 London 9 PRESTRESSED CONCRETE ASSOCIATION, 1 KUMAR, A Composite concrete bridge _ Prestressed concrete bridge beams ... the basis of the modular ratio of the two concretes According to the Code, the modulus of elasticity of lightweight-aggregate concrete is related to that of normal-weight concrete of the same ... square of the ratio of their dry densities For the flexural strength of the composite section at the ultimate limit state, the modular ratio will not be appli- cable, and the grades of two concretes

Ngày tải lên: 31/10/2016, 20:42

... performance of concrete beams under-designed in shear and retrofitted with CFRP strips bonded onto the sides of the beams The experimental investigation included a series of eight beams, of rectangular ... strength of concrete f fd Design value for the ultimate FRP stress f fdd Design value for the FRP debonding stress f fd,mam Maximum design stress in FRP f fe Effective stress of FRP f fed Design ... f A fv Area of the cross-section of an FRP sheet or strip = 2n.t f w f A s Area of the cross-section of steel stirrup b Width of the concrete-beam cross-section b c Width of concrete member

Ngày tải lên: 12/05/2017, 22:38

... Discipline Activity ModelFixed platforms—Concrete substructures checklists The objective of Appendix A is to present possible checklists for design of offshore concretesubstructures Such checklists ... personnel’scompetence in each case limit the value of the verificationactivities Trang 172 The degree of independence is often of vital importance to theconfidence in the results of the verification Internal ... platform—Concrete substructure design data checklist (3 pages)5 Order of Magnitude © 2000 Edited by Ivar Holand, Ove T Gudmestad and Erik Jersin Trang 4A1 Fixed platform—Concrete substructure design data checklist

Ngày tải lên: 01/05/2018, 10:17

... of 10% in the favour of the concrete option Trang 4Fig 1.2 Troll Gas, the largest platform of the CONDEEP type (bycourtesy of Aker Maritime) • completed 1995 • water depth 303 m • height of concrete ... application of high-strength concrete, the extended knowledge must be implemented as rules for high-strength concrete in standards and codes of practice (Section 1.6) 1.4 Design Offshore concrete ... procedures The mechanical properties of high-strength concrete differ in many ways from those of traditional concrete Thus, traditional design procedures for reinforced concrete cannot be extrapolated

Ngày tải lên: 01/05/2018, 10:17

... those having special interest in offshoreconcrete structures • promote and enhance the confidence in offshore concrete structures • give an overview of how to design a concrete platform, an overview ... besuitable reading for students 2.2 General description of an offshore concrete structure Prior to any further discussion regarding design of an offshore concrete structure, referencesare made to Figures ... The objective of project planning Design of an offshore structure should be regarded as a project, i.e a set of tasks to beaccomplished within a specified period of time, and with limited resources

Ngày tải lên: 01/05/2018, 10:17

... simulated, though in the form of one single regular wave The process of design wave evaluation ends up strictly with one design wave per responseparameter In practical design, however, emphasis is ... for global response analysis of gravity baseconcrete structures, which combines the contribution of the rigid element displacement of thestructure and the beam effect of the shafts The actual load ... effect for short fjord waves For maximum depth of submergence, the line of actionof the wave is highest The effects mentioned above can govern the design of the entire raft, notonly due to the high

Ngày tải lên: 01/05/2018, 10:17

... The further design process in the ultimate limit state is not based on the theory of elasticity, but on the assumption that concrete cannot take tensile stresses The process also uses design procedures ... studies of accuracy it is necessary to be aware of the phenomenon Tools to support the study of the accuracy of finite element models are so far only implemented in commercial software to a limited ... choice of element type and the modelling of the element mesh to understand the limitations of the program system (see examples in Section 4.2.5) If the program manuals or previous applications of

Ngày tải lên: 01/05/2018, 10:17

... the actual part ofstructure where they are involved in the design Fig 5.2 shows a simplified flow chart of thedesign process based on the use of a postprocessor The design of concrete sections ... description of the postprocessor and the limitations in the use of such a program The function of the postprocessor is not, however, explained in detail A moreextensive description of the design of offshore ... limit states: • Accidental limit state (progressive collapse) PLS Appropriate criteria are given for each limit state FLS and PLS are according to internationalterminology special cases of ultimate

Ngày tải lên: 01/05/2018, 10:17

... Part 3: Guidelines for the application of ISO 9001 in development, supply and maintenance of software. 6.1.2Special features of engineering and design of concrete structures at sea In relation ... and limitations of Chapter 6 The purpose of this chapter is to give a general view of the basic demands for Quality Assurance and throw light on what these imply when it comes to engineering, design ... calculation and dimensioning implies a certain risk of reduced awareness of the importance of keeping a general view on the construction • Short time limits often make it necessary to carry out simultaneously,

Ngày tải lên: 01/05/2018, 10:17

... is representative of the real structure Among critical areas in the present design of offshore structures are the modelling for stress analysis and the selection of relevant design wave situations ... and testing of computer programs • Load modelling • Response analysis • Capacity control • Tolerances in design • Drawings in accordance with design calculations • Design and forming of details ... 1Tore H.Søreide, Reinertsen EngineeringThe purpose of this description of verification is to present a procedure for control for detailed design of offshore structures For exemplification, Chapter

Ngày tải lên: 01/05/2018, 10:17

... depth ratios 4.7.6 Section design 4.8 Design of non-suspended ground floor slabs 4.9 Guidance for the design of basement walls 4 Plan area of foundations 5 Design of spread footings 4,10.5.1 ... cover for initial design of continuous members Table 3 Span/effective depth ratios for initial design of slabs Table 4 Span/effective depth ratios for initial design of beams Table 5 Ultimate loads ... majority of reinforced concrete buildings, but with the deliberate exclusion of some items For example, prestressed and lightweight concretes are not covered and the range of structures is limited

Ngày tải lên: 05/05/2018, 08:43

... quality of the design of prestressed concrete bridges Throughout my career I have been amazed by the number of grossly uneconomical and sometimes virtually unbuildable concrete bridge designs ... The nature of design blurred, with many engineers being members of both institutions, and some designers being members of the Institution of Civil Engineers only The specialisation of designers ... size of the cut-out The final judgement on a design must rest with the combined response of public and profession The choice of a solution that is expressive of the flow of forces applies to the design...

Ngày tải lên: 18/02/2014, 18:20

... References 28 Design properties of materials 29 2.1 Introduction 29 CONCRETE 2.2 Composition of concrete 30 2.3 Strength of concrete 30 2.4 Deformation of concrete 34 2.5 Predictions of the creep ... compression, and prestressed concrete tension members are discussed and design aspects are illustrated by examples A special feature of the book is the treatment of serviceability aspects of design Concrete ... Page iii DESIGN OF PRESTRESSED CONCRETE tailieuxdcd@gmail.com Page ii This page intentionally left blank tailieuxdcd@gmail.com Page iii DESIGN OF PRESTRESSED CONCRETE tailieuxdcd@gmail.com...

Ngày tải lên: 31/10/2016, 21:22

... general behavior of prestressed concrete beams with external cables Crushing of concrete Typical beam Beam with large eccentricities Crushing of concrete Fig.6.10 Ultimate state of beams C1 and C2 ... typical beams with the depth of cable of 0.25 m from the top surface, and beams with series B are the beams with large eccentricities with the depth of cable of 0.375 m Beams A1, B1 and beams with ... deformation of beams because of the lack of bond between the concrete and the cable -110- External Cable Imaginary concrete strain at cable level Deviator Concrete beam Fig.6.1 Imaginary concrete...

Ngày tải lên: 07/11/2012, 11:04

... Crushing of concrete b) Flexural behavior Non -prestressed reinforcement Fig.1.6 Behavior of fully prestressed and partially prestressed beams with external cables case of fully prestressed beams ... Fig.1.1 Classification of prestressed concrete beams Depending on the extent of bondage between the concrete and the prestressing cables, all the prestressed concrete beams can be mainly divided ... namely, prestressed concrete beams with bonded cables and prestressed concrete beams with unbonded cables And in each group, beams can be divided into small subgroup For example, beams prestressed...

Ngày tải lên: 07/11/2012, 11:04

... of concrete at the age of 28 days (35000) Relative Humidity of ambient environment (40 ~ 99) (70) Notational size of member (1) Type of cement>Normal or rapid hardening cement (N, R) Age of concrete ... “Construction stage analysis of prestressed concrete box bridge (FCM) using the Wizard”, and will not be repeated in this tutorial Construction Stage Analysis of Prestressed Concrete Box Bridge (FCM) ... Relative Humidity of ambient environment (40 ~ 99) (70) Notational size of member (1) Type of cement>Normal or rapid hardening cement (N, R) Age of concrete at the beginning of shrinkage (3) ↵...

Ngày tải lên: 01/04/2014, 03:20

... 38 Seismic Design of Reinforced Concrete Bridges 38.1 Introduction Two-Level Performance-Based Design • Elastic vs Ductile Design • Capacity Design Approach 38.2 Typical Column ... Beam Design Forces • Design of Uncracked Joints • Reinforcement for Joint Force Transfer 38.6 Yan Xiao University of Southern California Column Footing Design Seismic Demand • Flexural Design ... Shear Design • Joint Shear Cracking Check • Design of Joint Shear Reinforcement 38.1 Introduction This chapter provides an overview of the concepts and methods used in modern seismic design of reinforced...

Ngày tải lên: 08/07/2014, 12:20

... modulus of elasticity of concrete modulus of elasticity of concrete at transfer of stress modulus of elasticity of prestressing strand modulus of elasticity of steel flexural stiffness of compression ... stress in concrete at service loads specified yield stress, or design yield stress of fy = nonprestressed reinforcement = design yield stress of steel of bearing plate design yield stress of steel ... strength of concrete at time of initial prestress concrete stress immediately after transfer at center of gravity of prestressing steel f& = concrete bearing stress under anchor plate of post-tensioning...

Ngày tải lên: 24/10/2014, 16:04

... Torsion Design of Prestressed and Nonprestressed Concrete Beams, ” Journal of the Prestressed Concrete Institute, V 25, No 5, pp 32-100 Collins, M P., and Mitchell, D., 1981a, Discussion of “Shear ... variable angle of inclination of the diagonals, the concrete contribution for nonprestressed concrete members diminishes with the level of shear stress For prestressed concrete members, the concrete ... Torsion Design of Non -prestressed Concrete Beams, ” Journal of the Prestressed Concrete Institute, V 26, No 6, pp 96-118 Collins, M P., and Mitchell, D., 1985, “Chapter 4—Shear and Torsion,” CPCA Concrete...

Ngày tải lên: 24/10/2014, 17:26