TY - JOUR
T1 - Evaluation of Creep Effects on the Time-dependent Deflections and Stresses in Prestressed Concrete Bridges
AU - Hedjazi, Saman
AU - Rahai, Alireza
AU - Sennah, Khaled
N1 - In this paper, time-dependent deflections, stresses and internal forces in prestressed concrete box-girder bridges due to creep of concrete are investigated. Simple equations, correlated with a step-by-step numerical simulation analysis, are develope
PY - 2007/6/6
Y1 - 2007/6/6
N2 - In this paper, time-dependent deflections, stresses and internal forces in prestressed concrete box-girder bridges due to creep of concrete are investigated. Simple equations, correlated with a step-by-step numerical simulation analysis, are developed to calculate long-term behavior of segmentally erected prestressed concrete box-girder bridges built by the balanced-cantilever method. Three-dimensional finite-element models of the mentioned bridges, including effects of the load history, material nonlinearity, creep and aging of concrete, were developed using ABAQUS software. The three-dimensional shell elements are used for modeling box-girder walls, while Rebar elements are used for modeling prestressing tendons. The step-by-step procedure allows the simulation of the construction stages, effects of time-dependent deformations of materials and changes in the bridges’ structural system. Different examples of bridges, built by the balanced- cantilever method, are studied over a 30-year duration. Practical equations are modified to calculate time-dependent deflections and redistribution of internal stresses and forces in bridges constructed by the balanced-cantilever method, and good agreements between the results of the proposed method and numerical analysis are found. Significant time-dependent effects on bridge deflections and redistribution of internal forces and stresses are observed.
AB - In this paper, time-dependent deflections, stresses and internal forces in prestressed concrete box-girder bridges due to creep of concrete are investigated. Simple equations, correlated with a step-by-step numerical simulation analysis, are developed to calculate long-term behavior of segmentally erected prestressed concrete box-girder bridges built by the balanced-cantilever method. Three-dimensional finite-element models of the mentioned bridges, including effects of the load history, material nonlinearity, creep and aging of concrete, were developed using ABAQUS software. The three-dimensional shell elements are used for modeling box-girder walls, while Rebar elements are used for modeling prestressing tendons. The step-by-step procedure allows the simulation of the construction stages, effects of time-dependent deformations of materials and changes in the bridges’ structural system. Different examples of bridges, built by the balanced- cantilever method, are studied over a 30-year duration. Practical equations are modified to calculate time-dependent deflections and redistribution of internal stresses and forces in bridges constructed by the balanced-cantilever method, and good agreements between the results of the proposed method and numerical analysis are found. Significant time-dependent effects on bridge deflections and redistribution of internal forces and stresses are observed.
KW - Balanced-cantilever construction
KW - Box-girder
KW - Creep
KW - Creep analysis
KW - Long-term deformations
KW - Prestress
KW - Redistribution of stresses
KW - Segmental bridges
UR - https://doi.org/10.1080/15732480701496629
U2 - 10.1080/15732480701496629
DO - 10.1080/15732480701496629
M3 - Article
SN - 1573-2487
VL - 3
JO - Bridge Structures
JF - Bridge Structures
ER -