常规桥梁搭板内力计算方法在SIAB中的适用性

探讨了常规有缝桥梁搭板内力计算方法在半整体式桥台桥梁(SIAB)中的适用性.首先,介绍常规有缝桥梁搭板的内力计算方法,根据SIAB的构造特点,分析搭板近台端受到结构温变变形和收缩徐变引起的水平力、弯矩和剪力的影响;然后,建立SIAB搭板的有限元法(FEM)模型,并分析这些内力对SIAB搭板内力计算的影响程度.分析结果表明:剪力、弯矩的影响很小,可以忽略不计,但水平力的影响很大,搭板在进行内力计算时需加以考虑.最后,提出了简支梁修正法,并与既有有缝桥梁搭板内力计算方法做了对比.结果表明:有缝桥梁搭板内力计算方法不适用于SIAB搭板内力计算的结论.

Adaptability Analysis of Conventional Internal Force Calculation Method for Approach Slab of SIAB

The adaptability of calculation method for internal forces of approach slab in semi-integral abutment bridge(SIAB)was discussed. Firstly, the conventional bridge internal forces calculation method of approach slab was introduced. According to the structural characteristics of SIAB, the influence on approach slab near the abutment, due to horizontal force, bending moment and shear force caused by structural thermal deformation and shrinkage and creep, was analyzed. Then, FEM model of approach slab of SIAB was established, and the influence of the internal forces on the approach slab of SIAB was analyzed. The results show that the influence of the shear force and the bending moment is negligible; however, the influence of the horizontal force is significant, which would be considered in the calculation of internal force. Finally, a correction method for simply-supported beam is put forward, and a comparison of calculation methods for approach slabs between conventional bridge and SIAB is conducted, which concludes that the calculation method for calculating the internal force of approach slab in conventional jointed bridge is not suitable for SIAB.