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（1 寧夏大學(xué)土木與水利工程學(xué)院， 銀川 750021； 2 蘭州理工大學(xué)防震減災(zāi)研究所， 蘭州 730050；3 北方民族大學(xué)土木工程學(xué)院， 銀川 750021）

［摘要］在極端偶然荷載作用下，極有可能發(fā)生因局部構(gòu)件失效而引起的整體結(jié)構(gòu)破壞甚至倒塌，具有特殊構(gòu)造形式的隔震結(jié)構(gòu)則需要專門設(shè)計(jì)來(lái)應(yīng)對(duì)此類風(fēng)險(xiǎn)。應(yīng)用SeismoStruct軟件建立基礎(chǔ)隔震結(jié)構(gòu)有限元模型，通過(guò)改變上部結(jié)構(gòu)抗震構(gòu)造，隔震層梁、板尺寸，以及隔震支座型號(hào)等關(guān)鍵參數(shù)，對(duì)比分析了相應(yīng)剩余結(jié)構(gòu)的抗連續(xù)倒塌性能，探討了隔震結(jié)構(gòu)關(guān)鍵參數(shù)對(duì)抗倒塌性能的影響以及隔震結(jié)構(gòu)抗連續(xù)倒塌設(shè)計(jì)方法。結(jié)果表明：水平向減震系數(shù)可降低一度分檔，同時(shí)又有抗連續(xù)倒塌設(shè)計(jì)需求的隔震結(jié)構(gòu)，建議上部結(jié)構(gòu)抗震構(gòu)造措施保持不降低處理；改變隔震層梁、板的尺寸均能一定程度影響剩余結(jié)構(gòu)響應(yīng)，但隔震層梁尺寸變化所產(chǎn)生的影響更為顯著；橡膠隔震支座型號(hào)的變化對(duì)隔震結(jié)構(gòu)抗連續(xù)倒塌的影響極為有限。

［關(guān)鍵詞］連續(xù)倒塌； 基礎(chǔ)隔震； 框架結(jié)構(gòu)； 構(gòu)造措施； 設(shè)計(jì)方法

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

*寧夏回族自治區(qū)重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（2018BEG03009），寧夏回族自治區(qū)重點(diǎn)研發(fā)計(jì)劃項(xiàng)目（引才專項(xiàng)）（2018BEB04006），國(guó)家自然科學(xué)基金項(xiàng)目（51608283，51778276），寧夏青年科技人才托舉工程（TJGC2019007）。

作者簡(jiǎn)介：包超，博士，副教授，Email：baochao@nxu.edu.cn。