大跨度斜拉桥边墩新型横向钢阻尼器减震体系及设计方法  

Seismic system and design method of transverse metallic yielding dampers on long-span cable-stayed bridge side piers

作　　者：沈星[1] 倪晓博[1,2] 叶爱君[1] 

机构地区：[1]同济大学土木工程防灾国家重点实验室,上海200092 [2]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《土木工程学报》2016年第5期110-119,共10页China Civil Engineering Journal

基　　金：973计划项目(2013CB036302);国家自然科学基金(51278375);土木工程防灾国家重点实验室项目(10-B-09)

摘　　要：针对大跨度斜拉桥边墩的横向抗震问题,提出桥梁新型横向钢阻尼器与滑动支座组合的一种边墩横向减震体系,以及基于桥梁实际抗震需求的减震体系设计方法。之后,以一座主跨620m的大跨度斜拉桥为工程背景,验证该方法的可行性。并从关键位置的地震反应、阻尼器对横向基本控制振型的影响、减震体系的耗能能力和地震动输入的影响等方面对边墩新型横向减震体系的减震效果进行全面分析。结果表明,大跨度斜拉桥边墩新型减震体系具有显著的减震效果;与常规体系相比,对地震动输入较不敏感。Towards the transverse seismic problems of long-span cable-stayed bridge side piers, a new transverse seismic system of bridge side pier, as a combination of bridge transverse metallic yielding dampers （TMYD） and sliding bearings, was proposed. Meanwhile, the theoretical design method of TMYD was developed in consideration with actual seismic demand of bridge. Then, a practical cable-stayed bridge with 660m main span was taken as an example to demonstrate the feasibility of this method. Furthermore, a complete analysis was carried out for the new transverse seismic system of bridge piers from the following aspects, including seismic response of key parts, effect of dampers on the transverse basic control vibration mode, energy-dissipation capacity of seismic system and effect of seismic input. The results show that the new seismic system of long-span cable-stayed bridge side piers exhibits pronounced damping effect and compared to the conventional system, the new system is insensitive to the seismic input.

关 键 词：大跨度斜拉桥 边墩 横向 横向钢阻尼器 减震设计 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]