近斷層地震作用下隔震結(jié)構(gòu)基底碰撞響應(yīng)分析及傾覆倒塌模擬*
杜永峰1,2,王小虎1，朱翔1
- 摘 要
-
杜永峰1,2,王小虎1，朱翔1(1 蘭州理工大學(xué)防震減災(zāi)研究所,蘭州 730050； 2 西部土木工程防災(zāi)減災(zāi)教育部工程研究中心，蘭州 730050)［摘要］近斷層脈沖型地震作用下，建筑的隔震層會(huì)產(chǎn)生較大的側(cè)移，與周邊基坑擋墻可能發(fā)生碰撞。采用非線性彈簧來模擬基坑擋墻，考慮上部結(jié)構(gòu)的彈塑性變形。利用基于非線性彈簧的碰撞模型，分析了近場(chǎng)、遠(yuǎn)場(chǎng)地震作用下隔震結(jié)構(gòu)的碰撞響應(yīng)，探討了隔震結(jié)構(gòu)與周邊基坑的預(yù)留間距對(duì)隔震結(jié)構(gòu)碰撞的影響。并通過二次開發(fā)，采用生死單元法，模擬了碰撞導(dǎo)致隔震結(jié)構(gòu)的傾覆倒塌?；谠隽縿?dòng)力分析(IDA)的分析結(jié)果表明：近場(chǎng)地震作用下隔震結(jié)構(gòu)更容易發(fā)生碰撞，對(duì)隔震結(jié)構(gòu)的傾覆效應(yīng)更具相關(guān)性，碰撞導(dǎo)致隔震支座產(chǎn)生受拉破壞繼而發(fā)生傾覆倒塌。［關(guān)鍵詞］近斷層地震；隔震結(jié)構(gòu)；碰撞響應(yīng)；倒塌模擬；增量動(dòng)力分析中圖分類號(hào)：TU352.12 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2013)02-0056-04Overturning collapse simulation of isolation structure under near-fault seismic motion considering potential poundingDu Yongfeng1,2, Wang Xiaohu1, Zhu Xiang1(1 Institute of Earthquake Protection and Disaster Mitigation, Lanzhou University of Technology, Lanzhou 730050, China; 2 Western Center for Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou 730050, China)Abstract: The isolation story will have a greater deformation, potential pounding may occur at the isolation level between the building and its surrounding retaining walls under the near-fault pulse-type seismic motion. Non-linear springs were employed to simulate the impact of the boundary, and elastic-plastic deformation of the upper structure was also considered. The pounding response of the isolation structure under near-fault and far-fault seismic and the impacts of the pounding under different tectonic space were studied by the collision model based on non-linear springs. Through "birth-death” element defined in the user’s subroutine, collapse leaded by pounding was simulated. The Incremental Dynamic Analysis(IDA) result shows that structures under near-fault seismic are more likely to crash compared with far-fault seismic, and it is more relevant with overturning of isolation structure. Simulation results show that pounding lead to isolation bearing damage and subsequent overturning collapsed.Keywords: near-fault earthquake; seismic isolated structure; pounding response; collapse simulation; IDA*國家自然科學(xué)基金（50978130）參考文獻(xiàn)［1］ MALHOTRA P K. Dynamics of seismic impacts in base-isolated buildings［J］. Earthquake Engineering & Structural Dynamics, 1997, 26(8): 797-813.［2］ TSAI H C. Dynamic analysis of base-isolated shear beams bumping against stops［J］. Earthquake Engineering & Structural Dynamics, 1997, 26(5): 515-528.［3］ 葉昆, 李黎. LRB基礎(chǔ)隔震結(jié)構(gòu)在近斷層脈沖型地震作用下的動(dòng)力響應(yīng)研究［J］. 工程抗震與加固改造,2009, 31(2): 32-39.［4］ 葉昆, 李黎. 改進(jìn)的Kelvin碰撞分析模型［J］. 工程力學(xué), 2009, 26(SⅡ): 245-248.［5］ 葉獻(xiàn)國, 謝一可, 李康寧. 基礎(chǔ)隔震結(jié)構(gòu)在側(cè)向碰撞下的地震反應(yīng)分析［J］. 地震工程與工程振動(dòng), 2008,28(4): 161-167.［6］ 符蓉，葉昆，李黎. LRB基礎(chǔ)隔震結(jié)構(gòu)在近斷層脈沖型地震作用下的碰撞響應(yīng)［J］.工程力學(xué),2010,27(SⅡ): 298-302.［7］ 樊劍, 劉鐵, 魏俊杰. 近斷層地震下摩擦型隔震結(jié)構(gòu)與限位裝置碰撞反應(yīng)及防護(hù)措施研究［J］. 土木工程學(xué)報(bào), 2007, 40(5):10-16.［8］ 葉昆, 李黎. 近斷層脈沖地震作用下偏心基礎(chǔ)隔震結(jié)構(gòu)的地震反應(yīng)研究［J］. 工程力學(xué),2009,26(7):163-169.［9］ 杜永峰,李慧. 雙向地震激勵(lì)下隔震結(jié)構(gòu)抗傾覆特性的數(shù)值分析［J］. 計(jì)算機(jī)輔助工程, 2011, 20(1):42-46.
- 下載地址
-
你還沒注冊(cè)？或者沒有登錄？這篇論文要求至少是本站的注冊(cè)會(huì)員才能閱讀！
如果你還沒注冊(cè)，請(qǐng)趕緊點(diǎn)此注冊(cè)吧！
如果你已經(jīng)注冊(cè)但還沒登錄，請(qǐng)趕緊點(diǎn)此登錄吧！
