A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluation of creep effects on the time-dependent deflections and stresses in prestressed concrete bridges
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.
Evaluation of creep effects on the time-dependent deflections and stresses in prestressed concrete bridges
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.
Evaluation of creep effects on the time-dependent deflections and stresses in prestressed concrete bridges
Bridge Structures ; 3 ; 119-132
2007-01-01
14 pages
Article (Journal)
Electronic Resource
English
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