近場(chǎng)脈沖型強(qiáng)震下基礎(chǔ)隔震結(jié)構(gòu)的非線性反應(yīng)與限位分析*
顏桂云1,2，項(xiàng)洪1，張錚1，陳盛富1，何夢(mèng)超1
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（1 福建工程學(xué)院土木工程學(xué)院， 福州 350118； 2 湖南大學(xué)土木工程學(xué)院， 長沙 410082）
［摘要］近場(chǎng)地震動(dòng)是具有長周期、短持時(shí)、高能量的速度脈沖運(yùn)動(dòng)，其對(duì)基礎(chǔ)隔震的減震性能產(chǎn)生不利影響。建立一幢10層鋼筋混凝土框架基礎(chǔ)隔震的有限元模型，分析其在近場(chǎng)脈沖型強(qiáng)震與常規(guī)強(qiáng)震作用下的非線性反應(yīng)，探討速度脈沖對(duì)層間彈塑性位移、層間剪力、隔震層變形及隔震結(jié)構(gòu)塑性鉸分布的影響。提出在隔震層增設(shè)黏滯阻尼器，形成混合隔震方案，分析其對(duì)隔震層的限位保護(hù)效果及其對(duì)隔震結(jié)構(gòu)非線性反應(yīng)的減震效果。結(jié)果表明：基礎(chǔ)隔震在速度脈沖近場(chǎng)強(qiáng)震作用下的非線性反應(yīng)較常規(guī)強(qiáng)震顯著增大；隔震層最大變形顯著增加，遠(yuǎn)超過了隔震支座容許變形值?？紤]近場(chǎng)影響系數(shù)不能有效反映長周期速度脈沖對(duì)隔震結(jié)構(gòu)的不利影響?；旌细粽鹉苡行Э刂聘粽饘由喜拷Y(jié)構(gòu)的非線性反應(yīng)與隔震層最大變形，避免隔震支座破壞而導(dǎo)致上部結(jié)構(gòu)傾覆失穩(wěn)。［關(guān)鍵詞］基礎(chǔ)隔震; 近場(chǎng)地震; 混合隔震; 非線性反應(yīng); 隔震層限位中圖分類號(hào)：TU352.1 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2016)11-0096-06
Nonlinear responses of base-isolated structures and limiting deformation of isolation layers under near-field pulse-like strong ground motionsYan Guiyun1,2, Xiang Hong1, Zhang Zheng1, Chen Shengfu1, He Mengchao1(1 College of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China;2 College of Civil Engineering, Hunan University, Changsha 410082, China)Abstract: Near-field ground motions are characterized by horizontal pulse motions of velocity with long period, short duration and high energy, which exert adverse impacts on base-isolated structures. The finite element model of a base-isolated building with 10-story reinforced concrete frame structure was set up to analyze seismic responses of the building when subjected to near-field pulse-like and common strong ground motions. The effects of velocity pulse on interstory plastic drifts, interstory shear forces, deformation of isolation layer as well as distribution of plastic hinges were explored. Then, the hybrid isolation which had viscous dampers installed on the isolation story was developed, and its influences on limiting deformation of isolation layer and reducing nonlinear response were discussed. The results show that nonlinear responses of the base-isolated structure subjected to ground motions with velocity pulse are much greater than those subjected to common ground motions. The maximum deformation of isolation layer obviously increases and is far beyond the allowable deformation of isolation bearings. The negative impacts of long-period velocity on the base-isolated structure cannot be taken into account through near-field influence coefficient. The results also indicate that the hybrid isolation can significantly decrease nonlinear responses of the superstructure above the isolation layer and the maximum deformation of isolation layer, preventing collapse of the superstructure caused by isolation bearings destruction.Keywords: base isolation; near-field pulse-like ground motion; hybrid isolation; nonlinear response; limiting deformation of isolation layer
*國家自然科學(xué)基金資助項(xiàng)目(51378124)，福建省教育廳項(xiàng)目(JA15324;JA11185)。作者簡介：顏桂云，博士，副教授，Email：yanguiyun@sina.com。
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