磁式滑移隔震体系及其在基础隔震中的应用  

Sliding magneto-type isolator and its application in base isolation for mitigating seismic response

作　　者：彭勇波[1] 李杰[1] PENG Yongbo;LI Jie(State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China)

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

出　　处：《南京工业大学学报（自然科学版）》2021年第3期300-310,共11页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家自然科学基金(51678450);土木工程防灾国家重点实验室课题(SLDRCE19-B-26)。

摘　　要：研究了一类基于电涡流自适应耗能机制和可变限位模式的磁式滑移隔震体系,并考虑不同的界面摩擦特性,研制了以聚四氟乙烯板(PTFE)铝板为滑动界面的内磁式滑移隔震支座(IMB)和以高压机油铝板为滑动界面的液磁式滑移隔震支座(HMB)。通过开展隔震支座磁电耦合有限元模拟、理论推导和拟静力试验,深入研究了磁式滑移支座力位移关系,揭示了磁式滑移隔震结构系统的场地适应性:在近远场地震动、软硬场地土条件下,IMB、HMB比铅芯橡胶支座(LRB)、摩擦摆支座(CSS)具有更优越的隔震性能。在此基础上,进行了非平稳随机地震动作用下磁式滑移隔震结构随机地震响应与可靠度分析,开展了基于整体抗震可靠度的隔震结构系统优化设计:优化后隔震支座抵抗滑移变形能力和耗能能力均增强一倍,在罕遇地震作用下,隔震层位移可靠度提升15%。本文研究为高烈度地震区传统隔震体系面临的瓶颈问题提供了良好的解决方案。A group of sliding magneto-type isolators with eddy-current dissipation mechanism and alterable deformation constraint mode are developed based on the frictional behavior of shding surface,which include sliding implant-magnetic bearings(IMB)and sliding hydromagnetic bearing(HMB).By conducting finite element analysis,theoretical analysis and quasi-static testing,the refined restoring force modeling of isolators are studied,and the adaptability of sliding magneto-type isolator to the site condition is revealed.It shows that the sliding magneto-type isolator has a better performance than traditional isolators,such as lead rubber bearing(LRB)and curved surface slider(CSS)at various local sites with stiff and soft soils,and with far-field and near-field ground motions.Seismic isolation response analysis and reliability-based design optimization of isolated structure with the proposed isolators are conducted.It shows that the deformation constraint and energy-dissipation capacity of the sliding magneto-type isolator are doubled when the reliability-based design optimization has been carried out;meanwhile,the reliability of isolation layer displacement enhances 15%.This study provides a practical solution to circumventing the technical challenges iriherent in conventional isolation systems in high-intensity earthquake zones.

关 键 词：磁式滑移支座 恢复力建模 场地适应性 随机地震动 可靠度优化设计 

分 类 号：TU352.12[建筑科学—结构工程]