Influence of Deck Panel Construction Sequence on Load Bearing Performance of Steel-Concrete Composite Girder Bridge and Optimization
In this paper,the General Drawing of Prefabricated I-Type Composite Beam Bridge issued by the Ministry of Transport of the People's Republic of China is consulted to analyze the influence of deck panel construction sequence on the load bearing behaviors of the steel-concrete composite girder bridge after completion and optimize the commonly-used deck panel construction sequence.A finite element model of a steel-concrete composite girder bridge with three continuous spans of 40 m was developed in Dr.Bridge,with the deck panel construction timeline and structural system transformation timing as variables,to analyze the load bearing behaviors of the bridge structure when seven different construction sequences of deck panels were applied.It is shown there exists two stress states,namely the one-off stress state(dead loads are applied to the composite girder at a time)and staged stress state(including the stage where the steel girders independently carry the dead loads and the stage the dead loads are carried by the composite cross-section).To combine the steel girders and deck panels first in a span together and then erect the whole composite structure can lead to eased construction sequence,greater overall stiffness of the structure and smaller stresses in the steel girders during construction,but oversized tensile stresses in the deck panels at supports,while to erect the steel girders in a span first and then construct the deck panels and combine the two can effectively reduce the tensile stresses in the deck panels at supports,but induce oversized stresses in the steel girders and insufficient structural stiffness after completion of the bridge.Neither of the two deck panel construction sequences could allow the bridge to have sound performance after completion while bringing the tensile stresses in the deck panels at supports under proper control.The mixed construction sequence draws the advantages of both the two states,which enables the bridge to have sound performance after completion and notably reduce the tensile stresses in the deck panels at supports.
steel-concrete composite girder bridgedeck panelstructural system transformationconstruction sequencemechanical propertyfinite element method
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