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Mechanical Characteristics of Integral Abutment Bridges with Different Substructures

ZHU Wei-qing;LIU Yong-jian;HENG Jiang-feng;WANG Wei-shan;School of Highway,Chang'an University;Xi'an Highway Research Institute;  
Considering the abutment-soil interaction and pile-soil interaction,the finite element models of integral abutment bridges were established.The parameters including the types of substructures,temperature action,backfill properties and bridge length were selected,and the mechanical characteristics of integral abutment bridges with different substructures were studied.The results show that the substructures with larger stiffness provides stronger restraint to superstructures and the longitudinal structural integrity of the bridge is more obvious,but the stress states of girder ends and abutments are worse.The effects of temperature action on the internal forces and deformations of bridges are more obvious if the stiffness of substructures is larger.The influence of the uniform temperature effect becomes the main factor of temperature action with the increase of bridge length.When the short abutment and pile foundation are used,the effects of backfill density on the bending moment of girder ends and abutments,and the axial force of girders are not obvious.When the wall-type integral abutments are used,with the increase of backfill density,the axial force of main beam will increase rapidly under temperatureaction.The internal forces of the integral abutment bridges increase with the increase of bridge length,and the increasing rate is faster when the substructures with larger stiffness are used.If the widths of concrete cracks are chosen as the control target when the abutments are under serviceability limit state,it is suggested that the bridge length should be limited,and the limit of maximum bridge length is more strict when the stiffness of the substructure is greater.
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