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（蘭州理工大學(xué)土木工程學(xué)院， 蘭州 730050）

［摘要］由于隔震結(jié)構(gòu)具有典型的非比例阻尼特性，若采用實(shí)振型分解反應(yīng)譜法，計(jì)算結(jié)果會(huì)有較大誤差，但實(shí)振型分解反應(yīng)譜法計(jì)算簡(jiǎn)單，工程人員較易掌握。因此，分析了影響隔震結(jié)構(gòu)實(shí)振型分解反應(yīng)譜法計(jì)算精度的幾個(gè)因素，包括隔震層等效線性化參數(shù)、阻尼參數(shù)計(jì)算和設(shè)計(jì)反應(yīng)譜。通過(guò)對(duì)這三個(gè)因素的分析，針對(duì)隔震結(jié)構(gòu)提出了具有較高計(jì)算精度的實(shí)振型分解反應(yīng)譜法。工程實(shí)例表明，采用改進(jìn)后的實(shí)振型分解反應(yīng)譜法與時(shí)程分析結(jié)果相比，誤差在5%左右，可滿足工程設(shè)計(jì)的要求。

［關(guān)鍵詞］隔震結(jié)構(gòu)； 實(shí)振型分解反應(yīng)譜法； 等效線性化； 振型阻尼比； 設(shè)計(jì)反應(yīng)譜

中圖分類號(hào)：TU352-1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)16-0120-07

Analysis of calculation accuracy and improvement of real mode superposition response spectrum method of isolated structures

Dang Yu, Tian Hongtu

（School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China)

Abstract:Because the isolated structure has typical non-proportional damping characteristic, using the real mode superposition response spectrum method to analyze structure will cause large calculation error, but the method is simple, which is easy for engineers to grasp. Therefore, several factors influencing the calculation accuracy of the real mode superposition response spectrum method of the isolated structure were analyzed, including the equivalent linearization parameters of the isolation layer, the calculation of damping parameters and the design response spectrum. Through the analysis of three factors, the real mode superposition response spectrum method with high computational accuracy was proposed for the isolated structure. The engineering examples show that，compared with the time history analysis method, the error for the calculated results of the improved real mode superposition response spectrum method is about 5%, which can satisfy the requirements of engineering design.

Keywords:isolated structure; real mode superposition response spectrum method; equivalent linearization; mode damping ratio; design response spectrum

*國(guó)家自然科學(xué)基金項(xiàng)目（51668043），甘肅省建設(shè)科技攻關(guān)項(xiàng)目（JK2015-11）。

作者簡(jiǎn)介：黨育，博士，教授，Email:601363791@qq.com。