城市高架桥抗震支撑体系优化设计与经济性分析  

Optimization Design and Economy Analysis of Seismic Support Systems for Urban Viaducts

作　　者：管仲国[1] 沙丽新 李建中[1] 

机构地区：[1]同济大学土木工程国家重点实验室,上海200092 [2]上海城市建设设计研究总院,上海200215

出　　处：《桥梁建设》2014年第2期78-84,共7页Bridge Construction

基　　金：国家自然科学基金项目(51008222);中央高校基本科研业务费专项资金资助项目(20113184)~~

摘　　要：为了优选城市高架桥抗震支撑体系,促进减、隔震技术的合理应用,以嘉闵高架桥为依托,针对系列标准跨桥梁,考虑不同墩高和截面尺寸,分别选用延性抗震体系与减、隔震体系,分析其地震响应规律,并通过合理匹配地震需求与结构能力,对基础等主要构件的设计参数进行了优化分析,在此基础上,进一步分析了2种抗震体系的经济性。研究结果表明:延性抗震体系适用于高墩区,合理选择墩柱截面尺寸可以显著优化结构体系,并有效降低其总体造价;减、隔震体系更适用于矮墩区,尽管其价格远高于普通盆式支座,但采用减、隔震体系后基础部分的造价可节约,进而在总体上获得较好的经济性。To optimize the seismic support systems for urban viaducts and to promote proper application of the seismic mitigation and isolation techniques, the mainline viaduct on the Jiamin Elevated Route in Shanghai was taken as the research object. In view of the viaduct having the se- rial standard spans, different pier height and pier sectional dimensions, the ductility seismic re- sistant system and the seismic mitigation and isolation system were respectively selected and ap- plied and the laws of seismic responses of the two kinds of the systems were analyzed. By proper- ly matching the seismic resistant requirements and the structural capacity, the design parameters of the principal structural components of the foundations of the viaduct were optimally analyzed and further to the analysis, the economy of the two systems was analyzed. The results of the a- nalysis indicate that the ductility seismic resistant system is applicable to area of the viaduct with tall piers. The proper selection of the sectional dimensions of the pier columns can significantly optimize the structural system and effectively reduce the total structural cost. The seismic mitiga- tion and isolation system is more applicable to the area of the viaduct with short piers. Though the cost of the seismic mitigation and isolation system is far more expensive than that of the com- mon pot bearings, the cost can be effectively compensated by the cost saving of the foundations after the system is applied and as a consequence, better economy can be achieved in general.

关 键 词：高架桥 抗震体系 延性抗震 减 隔震技术 经济性 有限元法 

分 类 号：U448.28[建筑科学—桥梁与隧道工程] U442.55[交通运输工程—道路与铁道工程]