既有大准铁路16m 简支 T 梁横向加固研究及应用

摘要

By the computation of finite element and dynamic performance testing, it's found that the lateral rigidity for the existed bridge of Da-Zhun line is not accustomed to the new capacity, and the simply -supported T-beams are needed to be reinforced.The general direction of reinforcement is pointed out by analyzing affecting factors of bridge dynamic performance.By calculating and comparing different reinforcement schemes with the help of the finite elements software MIDAS/Civil,optimal ideas are determined,and finally the recommendation is given:beam end diaphragm is to be widened by 0.65 m, and this section must be prestressed.This scheme is proved reasonably practicable by the theoretical and experimental data.%通过有限元理论计算及既有桥动力性能测试，指出大准线既有简支 T 梁横向刚度不能满足线路扩能需要，需要进行加固。从机理上对影响桥跨动力性能的因素进行了分析，指明了加固的总体方向。利用 MIDAS／Civil 有限元软件，对不同加固方式进行计算，比较并确定了最优加固思路，最终给出了推荐方案：加宽梁两端上下横隔板各0．65 m，且对加宽部位施加横向预应力。理论及实测结果表明，加固方案合理可行。