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（山東科技大學(xué)山東省土木工程防災(zāi)減災(zāi)重點(diǎn)實(shí)驗(yàn)室， 青島 266590）
［摘要］為了研究層間平臺板處設(shè)置滑動支座的四梯柱RC框架結(jié)構(gòu)樓梯間的抗震性能，設(shè)計(jì)了1/3縮尺模型并進(jìn)行擬靜力試驗(yàn)，分析了其裂縫開展、破壞機(jī)制、滯回曲線以及耗能能力等。試驗(yàn)結(jié)果表明：樓梯一端與框架分離避免了樓梯的“K”形支撐作用，提高了結(jié)構(gòu)延性；在結(jié)構(gòu)破壞方面，層間平臺板發(fā)生約25mm幅度的掀起現(xiàn)象，但并未開裂，梯柱、梯板基本無破壞，試件表現(xiàn)出了良好的抗震安全性；破壞時框架柱柱底與梯柱柱底鋼筋應(yīng)變幅值分別為2382με和-139με，數(shù)值上相差達(dá)16倍，框架是試件耗能的主體，樓梯構(gòu)件沒有參與結(jié)構(gòu)整體受力，試件屈服機(jī)制較為理想。
［關(guān)鍵詞］框架結(jié)構(gòu)； 防震樓梯； 擬靜力試驗(yàn)； 抗震性能； 屈服機(jī)制
中圖分類號：TU375-4文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2019)12-0079-04
Experimental research on seismic performance for aseismatic staircase of RC frame structure
Cong Shuping, Chen Jiaxue, Peng Min
（Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, China）
Abstract:In order to study the seismic performance of the four-column RC frame staircase with sliding support at the intermediate platform board, the 1/3 scale model was designed and the pseudo\|static test was carried out to study its crack development, failure mechanism, hysteretic curve and energy dissipation capacity. Results indicate that separating the end of the stair from the frame avoids the “K” type support of the stair and improves the ductility of structure. In terms of structural damage, the intermediate platform board was lifted up 25mm but it did not crack, in addition, the ladder column and the ladder plate were basically free from damage. The specimen showed good performance of seismic safety. At the damage stage, the strain amplitude of frame column bottom and ladder column bottom is 2 382με and -139με respectively, while the two data values differ 16 times. The frame is the main part of the energy dissipation of the specimen, and the stair components do not participate in the overall lateral resistance process of the structure, and the yield mechanism of the specimen is ideal.
Keywords:frame structure; aseismatic staircase; pseudo-static test; seismic performance; yield mechanism
*青島市建設(shè)事業(yè)科技發(fā)展項(xiàng)目（JK2014-10）。
作者簡介：叢術(shù)平，博士，講師，Email：congshp@163.com。
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