Time Dependent Deformations In Segmental Prestressed Concrete Bridges
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Time Dependent Deformations In Segmental Prestressed Concrete Bridges
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Author : Vernon Marshall
language : en
Publisher:
Release Date : 1981
Time Dependent Deformations In Segmental Prestressed Concrete Bridges written by Vernon Marshall and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Concrete categories.
Time Dependent Deformations And Losses In Concrete Bridges Built By The Cantilever Method
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Author : Jose R. Danon
language : en
Publisher:
Release Date : 1977
Time Dependent Deformations And Losses In Concrete Bridges Built By The Cantilever Method written by Jose R. Danon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Cantilever bridges categories.
Analysis Of Time Dependent Effects On Segmental Prestressed Concrete Curved Box Girder Bridges
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Author :
language : en
Publisher:
Release Date : 1997
Analysis Of Time Dependent Effects On Segmental Prestressed Concrete Curved Box Girder Bridges written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Time Dependent Analysis Of Prestressed Concrete Segmental Bridges
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Author : Ghassan Ziadat
language : en
Publisher:
Release Date : 1988
Time Dependent Analysis Of Prestressed Concrete Segmental Bridges written by Ghassan Ziadat and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Time Dependent Behavior Of Segmental Cantilever Concrete Bridges
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Author : K. Nam Shiu
language : en
Publisher:
Release Date : 1983
Time Dependent Behavior Of Segmental Cantilever Concrete Bridges written by K. Nam Shiu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1983 with Bridges, Cantilever categories.
Time Dependent Deflection Of In Span Hinges In Prestressed Concrete Box Girder Bridges
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Author : Ahmed Akl
language : en
Publisher:
Release Date : 2015
Time Dependent Deflection Of In Span Hinges In Prestressed Concrete Box Girder Bridges written by Ahmed Akl and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Box girder bridges categories.
Post-tensioned multi-cell reinforced concrete bridges with in-span hinges in California have been experiencing undesirable and unexpected differential movements at expansion joints during and after construction. The deformation of in-span hinges in cast-in-place (CIP) prestressed concrete (PS) box girder bridges is referred to as "hinge curl" and is due to post tensioning forces. The difference between the elevations of the two sides of the hinge creates a bump on the road and presents a road hazard with risk to the travelling public safety. Accurate prediction of instantaneous and time-dependent deformation of superstructure in-span hinges is important to avoid mismatch at the intermediate expansion joints of bridges. A method to estimate hinge curl was developed by the California Department of Transportation (Caltrans) through Memo to Designers (MTD) No. 11-34 and has been used in design. However, this method often leads to estimate of deformations that are different from those in the field. Hence, grinding of the superstructure at the hinge and other remedial measures are often necessary, and this results in extra cost and delay. The principal aims of this study was to evaluate the MTD method based on field measurements and analytical studies, identify the extent and sources of discrepancy between the estimated and actual "hinge curl" deflections, and propose a new method to more accurately estimate short-term and long-term hinge curl. The research presented in this dissertation consisted of six parts: (1) field measurement of hinge movements in five bridges, (2) analysis of data and comparison with the estimated movements using the current method, (3) analytical studies of the five bridges using relative simple models utilizing software package SAP2000, (4) analytical studies of the five bridges using detailed finite element models utilizing ABAQUS, (5) analytical parametric studies of the effect of superstructure skew at abutments and horizontal curvature on the hinge curl, and (6) development of a new, practical method to improve on estimation of hinge curl. Deflections of superstructures were measured and monitored for five bridges in the state of California during construction until bridges were opened to traffic. Temperature and relative humidity data were also collected during field measurements. The field data were analyzed and the correlation with the current method for estimating hinge curl was investigated. Hinge curls were estimated according to Caltrans MTD 11-34 with the aid of computer models developed using CTBridge software. Substantial differences between the field data and estimated hinge curls were noted due to the inaccurate boundary condition assumption and other issues determined in the current design equations. Analytical studies were conducted using two modelling approaches, stick model and finite element model, to further investigate the deformation behavior of the bridges. SAP2000 was utilized for the first modelling approach and a more sophisticated program, ABAQUS, was utilized for the second approach to capture the three-dimensional deformation behavior. Construction sequence and material time-dependent effects were modelled in both approaches. Parametric studies of the effect of skewed abutments and horizontal curvature on hinge curl were performed using the finite element approach on ABAQUS. A new method was developed for estimating the immediate hinge curl. Modifications of the time-dependent deflection multipliers were proposed to improve prediction of the long term hinge curl. Hinge curls were calculated according to the proposed method and compared to those measured for verification. The study validated the applicability of the proposed method for hinge curl prediction. The new method and the modifications were summarized in addition to a design example in a new proposed document with MTD format to facilitate adoption of the new method by Caltrans.
Temperature Induced Deformations In Match Cast Segments And Their Effects On Precast Segmental Bridges
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Author : Raʼed Abendeh
language : en
Publisher: Cuvillier Verlag
Release Date : 2006
Temperature Induced Deformations In Match Cast Segments And Their Effects On Precast Segmental Bridges written by Raʼed Abendeh and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Time Dependant Analysis Of Prestressed Concrete Segmental Bridges
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Author : G. Ziadet
language : en
Publisher:
Release Date : 1988
Time Dependant Analysis Of Prestressed Concrete Segmental Bridges written by G. Ziadet and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
Non Linear Segmental Analysis Of Reinforced And Prestressed Concrete Bridges
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Author :
language : en
Publisher:
Release Date : 1990
Non Linear Segmental Analysis Of Reinforced And Prestressed Concrete Bridges written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
A method of analysis and a computer program SPCFRAME (1989) for the material and geometric non-linear analysis of segmentally erected planar prestressed concrete frames including the time-dependent effects due to load history, temperature history, creep, shrinkage, aging of concrete and relaxation of prestress, is described. The program, based on the finite element method using one-dimensional elements, is capable of predicting the response of these structures throughout their various stages of construction and service load history, as well as through the elastic, cracking, inelastic, and ultimate ranges. Changes in boundary conditions and loads, installation, and removal of frame elements and prestressing tendons can be incorporated in the FE model for segmental bridge construction operations. The program SPCFRAME (1989) has been developed by combining the capabilities of PCFRAME (1977) for the linear analysis of prestressed concrete structures erected in one step and of SFRAME (1986) for the time-dependent analysis of segmentally erected prestressed concrete structures with linear elastic material properties. A number of improved non-linear analysis features has also been added to program SPCFRAME (1989) which is available from the authors. Results from a bridge numerical example are presented to illustrate the capabilities of SPCFRAME (1989). For the covering abstract of the Conference see IRRD Abstract No. 807839.
Time Dependent Deformation Of Non Composite And Composite Sand Lightweight Prestressed Concrete Structures
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Author : Dan E. Branson
language : en
Publisher:
Release Date : 1969
Time Dependent Deformation Of Non Composite And Composite Sand Lightweight Prestressed Concrete Structures written by Dan E. Branson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1969 with Bridges categories.
Presented in this report is an investigation of the use of "sand-lightweight" concrete in prestressed concrete structures. The sand-lightweight concrete consists of 100% sand substitution for fines, along with Idealite coarse and medium lightweight aggregate and Type I Portland Cement. The study is divided into three parts: a materials study of the concrete itself, a laboratory study of the behavior of both non-composite (5 beams) and composite (4 beams) prestressed beams, and the field measurement of camber of prestressed bridge girders (5 girders). The test period for the laboratory beams was 5 months, although the data collection is continuing for 3 of the beams. The test period included in this report for the bridge girders was 4 months. The laboratory beams were designed in three groups (3 beams in each group) to investigate the loss of prestress, initial and time-dependent camber, load-deflection behavior, and effect of different slab casting schedules. Of principal interest in this Phase I study is the time-dependent behavior of sand-lightweight concrete as a material and as used in prestressed structures. This includes the loss of prestress and camber of members that undergo rather high initial strains (due to both high initial stresses and relatively low modulus of elasticity); the effect of the composite deck in reducing the stress level and corresponding creep rate and loss of prestress; and the effect of the time of casting the composite slab, since the rate of creep, loss of prestress, and camber growth are quite different before and after the slab is cast. Design procedures are presented for the following: 1. Calculation of creep and shrinkage of the sand-lightweight concrete of this project at any time after casting, including ultimate values. An indication is also given of the calculation of creep and shrinkage at any time after casting, including ultimate values, for normal weight, sand-lightweight, and all-lightweight concrete in general. 2. Both theoretical and approximate methods for calculating camber of non-composite and composite prestressed structures. Results computed by these methods are shown to be in reasonably good agreement with the control specimen data, the laboratory beam data, and the bridge girder data.