摘要
为满足某上跨软土深基坑的钢格构柱现浇钢筋混凝土梁板连续刚构干线铁路便桥竖、横向刚度评估的需要,计算了软土深基坑挖土过程中便桥结构的桥体动力特性。采用随机振动理论,仿真分析了客货列车通过便桥时的运营性能及结构振动响应,结果表明,在统计意义上与实测结果基本吻合。深入探讨了多方案便桥结构的振动性能。研究结果表明,即使在软土深基坑开挖期间,该便桥结构也能确保列车限速安全、平稳运营。提出了便桥结构体系的局部优化建议。
To evaluate the vertical and horizontal stiffness of continuous rigid frame temporary railway bridge with steel lattice column that overpasses deep foundation pit in weak soil, the dynamic characteristics of the whole digging process in the temporary bridge area are calculated systematically. By using the random vibration theory, the operation performance of vehicle and vibration response of the temporary bridge when a train passes on is stimulated and analyzed. The results of theoretical simulation are consistent with the field measured statistics. The vibration performance of the temporary bridge structure in multiple design schemes is discussed deeply. This study verifies that during the deep foundation pit construction, train could still run on the temporary bridge safely and steadily at a limited speed. Some optimization suggestions for the bridge structure system are put forward.
出处
《城市轨道交通研究》
北大核心
2013年第6期69-75,106,共8页
Urban Mass Transit
关键词
铁路便桥
钢格构柱连续刚构体系
软土深基坑
耦合振动分析
结构动力性能评判
railway temporary bridge
continuous rigid frame system with steel lattice column
deep foundation pit in weak soil
coupled vibration analysis
evaluation of structure dynamic performance
作者简介
高级工程师
