（1 宁夏大学土木与水利工程学院， 银川 750021； 2 兰州理工大学防震减灾研究所， 兰州 730050；3 北方民族大学土木工程学院， 银川 750021）

［摘要］在极端偶然荷载作用下，极有可能发生因局部构件失效而引起的整体结构破坏甚至倒塌，具有特殊构造形式的隔震结构则需要专门设计来应对此类风险。应用SeismoStruct软件建立基础隔震结构有限元模型，通过改变上部结构抗震构造，隔震层梁、板尺寸，以及隔震支座型号等关键参数，对比分析了相应剩余结构的抗连续倒塌性能，探讨了隔震结构关键参数对抗倒塌性能的影响以及隔震结构抗连续倒塌设计方法。结果表明：水平向减震系数可降低一度分档，同时又有抗连续倒塌设计需求的隔震结构，建议上部结构抗震构造措施保持不降低处理；改变隔震层梁、板的尺寸均能一定程度影响剩余结构响应，但隔震层梁尺寸变化所产生的影响更为显著；橡胶隔震支座型号的变化对隔震结构抗连续倒塌的影响极为有限。

［关键词］连续倒塌； 基础隔震； 框架结构； 构造措施； 设计方法

中图分类号：TU375-4文献标识码：A文章编号：1002-848X(2020)03-0052-07

Study on design method to resist progressive collapse for base-isolated structures

Bao Chao1, 2， Ma Xiaotong3，  Du Yongfeng2， Zhang Shangrong1， Che Jialing1， Zhang Lixing3

（1 School of Civil Engineering and Hydraulic Engineering, Ningxia University, Yinchuan 750021, China; 2 Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, China; 3 School of Civil Engineering, North Minzu University, Yinchuan 750021, China）

Abstract:Under extreme accidental loads, it is very likely that the structure will be destroyed in a whole or even collapse due to the failure of local components. As a special form of structure, the isolation structure with constructional measures needs special design to deal with such risks. Finite element models of base-isolated structure were established by SeismoStruct software. By changing key parameters of the constructional measure of the upper structure, the size of isolation layer beams and slabs and isolation bearing, the influence of key parameters on progressive collapse resistance of isolation structures and the design method of progressive collapse resistance of isolation structures were discussed. The results show that the horizontal damping coefficient can be reduced by one seismic fortification intensity degree and it is suggested that the seismic constructional measures of the superstructure should not be reduced for the isolation structure with the requirement of progressive collapse design. Changing the size of the isolation layer beams and slabs can affect the response of the remaining structure to a certain extent, but the change in the size of the isolation layer beams has a more significant impact. The influence of the type of rubber isolation bearing on the progressive collapse resistance of isolation structures is very limited.

Keywords:progressive collapse; base-isolated structure; frame structure; constructional measure; design method

*宁夏回族自治区重点研发计划项目（2018BEG03009），宁夏回族自治区重点研发计划项目（引才专项）（2018BEB04006），国家自然科学基金项目（51608283，51778276），宁夏青年科技人才托举工程（TJGC2019007）。

作者简介：包超，博士，副教授，Email：baochao@nxu.edu.cn。