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（1云南省安泰建設(shè)工程施工圖設(shè)計(jì)文件審查中心， 昆明650228；

 2 昆明理工大學(xué)建筑工程學(xué)院， 昆明  650500；  3 云南震安減震科技股份有限公司， 昆明 650500）

［摘要］基礎(chǔ)隔震結(jié)構(gòu)的近斷層脈沖型地震作用與常規(guī)地震作用相比，結(jié)構(gòu)的最大絕對(duì)加速度、隔震層的最大位移均有較大增加。通過算例分析，采用時(shí)程分析法對(duì)近斷層脈沖型地震作用的隔震結(jié)構(gòu)計(jì)算時(shí)，罕遇地震下的峰值加速度的取值決定了隔震支座的選擇。通過對(duì)《建筑抗震設(shè)計(jì)規(guī)范》（GB 50011—2010）12章及附錄L簡化計(jì)算方法的分析，三種罕遇地震峰值加速度取值對(duì)應(yīng)三種隔震支座布置的計(jì)算結(jié)果，8度區(qū)多層框架結(jié)構(gòu)，建議采用插值法進(jìn)行罕遇地震下隔震層計(jì)算，隔震層以上結(jié)構(gòu)的水平地震影響系數(shù)最大值，抗規(guī)公式(12.2.5)應(yīng)乘以近場影響系數(shù)。

［關(guān)鍵詞］近斷層脈沖型地震作用； 近場影響系數(shù)； 基礎(chǔ)隔震結(jié)構(gòu)； 時(shí)程分析； 峰值加速度； 罕遇地震

中圖分類號(hào)： TU375.4 文獻(xiàn)標(biāo)識(shí)碼： A文章編號(hào)：  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

作者簡介：陳朝暉，高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：349308752@qq.com。