铁路桥梁制动力调节体系的研究

Study on brake forces adaptive system for railway bridge

基于铅芯橡胶支座的性能 ,提出利用铅芯屈服前刚度合理调节列车制动力、利用铅芯屈服后刚度进行隔震的思路 ,并通过静力试验、动力特性测试及模拟地震振动台试验予以验证。试验结果表明 :设置橡胶支座后 ,可以有效地调整各墩台的综合刚度 ,按设计意图合理分配制动力 ;与传统支座桥梁相比 ,橡胶支座多跨简支模型桥梁的动力反应呈全桥一致反应 ,隔震效果显著 ,地震响应得以大幅度减小。

Based on the performance of lead rubber bearing(LRB), this paper proposes that the non yielded stiffness may be utilized to adapt brake forces properly, and the post yielded stiffness to isolate earthquake for railway bridge. This idea is verified by static test, dynamic characteristic test and simulated earthquake shaking table test. The results of model bridge test show that: LRB can effectively adapt the comprehensive stiffness of pier and abutment, and properly distribute brake forces according to design intention, the dynamic reactions of multi span simple support beams with LRB are identical in the whole bridge, the earthquake response is greatly reduced by LRB, and the isolation effect is remarkable compared with bridges with traditional bearing.