针对半整体式桥台桥梁（SIAB）搭板与普通有缝桥梁搭板的不同受力情况，基于概率统计法和简支梁法，考虑搭板尺寸、地基刚度的影响，提出了适用于SIAB搭板内力计算的简支梁修正法，通过对搭板计算长度的修正来等效弹性地基作用和主梁传递至搭板端部的水平力作用。采用有限元分析对比了简支梁法、弹性地基梁法与简支梁修正法。结果表明：简支梁修正法在SIAB搭板的内力计算中更为合理和简便，半整体式桥梁搭板的内力计算可按简支梁进行计算。%Aimed at the different loading conditions of semi‐integral abutment bridges (SIAB ) approach slab and common one ,modified simply‐supported beam method considering the effect of approach slab dimension and foundation stiffness was proposed to calculate the internal force of approach slab in SIAB based on probabilistic method and simply‐supported beam method . T he effective length was modified to obtain the reaction of elastic foundation and the one translated from beam to end of approach slab . Simply‐supported beam method , elastic foundation beam method and modified simply‐supported beam method were compared by finite element analysis . The results show that modified simply‐supported beam method is more reasonable and convenient ,and internal force calculation of approach slab in semi‐integral abutment bridge can accord to simply‐supported beam .
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