（1云南省安泰建设工程施工图设计文件审查中心， 昆明650228；

 2 昆明理工大学建筑工程学院， 昆明  650500；  3 云南震安减震科技股份有限公司， 昆明 650500）

［摘要］基础隔震结构的近断层脉冲型地震作用与常规地震作用相比，结构的最大绝对加速度、隔震层的最大位移均有较大增加。通过算例分析，采用时程分析法对近断层脉冲型地震作用的隔震结构计算时，罕遇地震下的峰值加速度的取值决定了隔震支座的选择。通过对《建筑抗震设计规范》（GB 50011—2010）12章及附录L简化计算方法的分析，三种罕遇地震峰值加速度取值对应三种隔震支座布置的计算结果，8度区多层框架结构，建议采用插值法进行罕遇地震下隔震层计算，隔震层以上结构的水平地震影响系数最大值，抗规公式(12.2.5)应乘以近场影响系数。

［关键词］近断层脉冲型地震作用； 近场影响系数； 基础隔震结构； 时程分析； 峰值加速度； 罕遇地震

中图分类号： TU375.4 文献标识码： A文章编号：  1002-848X(2016)S1-0439-06

Computing method considering near field influence in multi-story seismic isolation structure

Chen Zhaohui1， Wang Dong2， Wu Aiwu1， Shu Shiqi3

(1 Yunnan Antai Construction Design Document Examination Center, Kunming 650228, China;

2 Faculty of Civil Engineering and Architecture of Kunming University of Scienceand Technology, Kunming 650500, China;

3 Yunnan Earthquake Safety Shock-Absorbing Polytron Technologies, Kunming 650500, China)

Abstract： Compared with the general earthquake action, the maximum absolute acceleration of the base isolation structure and maximum displacement of isolation layer in the near-fault pulse-like earthquake action both have largely increased. By analysis of examples, the selection of isolation bearing is dependent on the value of peak acceleration under the rare earthquake, when calculating the seismic isolation structure in the near-fault pulse-like earthquake action by way of time-procedure analysis. By the analysis of chapter 12 of Code for seismic design of building (GB 50011—2010) and the simplified calculating method in the appendix L, the values of peak acceleration in three types of rare earthquakes correspond to three computation structures arranged by isolation bearings. As for the multistory frame structure in the zone of degree 8, it is suggested that the method of interpolation be utilized to calculate the isolation layer in the rare earthquakes. According to the formula 12.2.5 in the Code for seismic design of building, the maximum value of horizontalseismic influence coefficient above the seismic isolation layers should be multiplied by the near field influence coefficient.

Keywords： near-fault pulse-like earthquake action； near field influence coefficient； base isolation structure； time-procedure analysis； peak acceleration； rare earthquake

作者简介：陈朝晖，高级工程师，一级注册结构工程师，Email：349308752@qq.com。