钢筋混凝土大底盘工程场地地震响应分析
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摘要
水平土层场地尤其是特殊地形的场地地震响应计算是工程场地安全性评价的重要内容。本文以上海某在建超高层建筑中钢筋混凝土大底盘工程场地为背景,对其深覆盖土层场地进行了地震响应计算分析。为研究地震作用下刚性大底盘可能产生的地震动摆动效应,采用工程场地地震安评报告提供的3条地震波进行了一致激励和行波激励的地震响应分析。计算结果表明,混凝土大底盘具有刚体运动的特点,且具有一定的摆动效应,地震动强度越小,地震波激励方式引起的摆动效应差异越大。行波激励下底盘各点水平加速度响应较一致激励有所减小,按沿基岩一致地震输入进行土层地震反应分析偏于安全。
Seismic response analysis of horizontal soil layer,especially special terrain site,is an important part of seismic safety evaluation of engineering site. In this paper,a soil layer with site reinforced concrete large-base-plate of super high-rise building in Shanghai is taken as background,and seismic response analysis is studied for the deep coverage soil site. To analyze the rocking effect of existing reinforced concrete large-base-plate on the upper structure under the earthquake excitation,three seismic waves from the seismic safety evaluation report are used for the seismic response analysis of the site,and the input is respectively through excitation of uniform wave and traveling wave. The calculation results show that,the reinforced concrete large-base-plate has some rocking effects under the action of earthquake wave. The bigger the intensity of seismic wave,the less the rocking effect difference due to excitation mode. The horizontal acceleration value of the large-base-plate is reduced under traveling wave excitation compare with uniform excitation,so it is safe for seismic response analysis of soil layer site of this engineering under the uniform excitation of seismic wave.
Seismic response analysis of horizontal soil layer,especially special terrain site,is an important part of seismic safety evaluation of engineering site. In this paper,a soil layer with site reinforced concrete large-base-plate of super high-rise building in Shanghai is taken as background,and seismic response analysis is studied for the deep coverage soil site. To analyze the rocking effect of existing reinforced concrete large-base-plate on the upper structure under the earthquake excitation,three seismic waves from the seismic safety evaluation report are used for the seismic response analysis of the site,and the input is respectively through excitation of uniform wave and traveling wave. The calculation results show that,the reinforced concrete large-base-plate has some rocking effects under the action of earthquake wave. The bigger the intensity of seismic wave,the less the rocking effect difference due to excitation mode. The horizontal acceleration value of the large-base-plate is reduced under traveling wave excitation compare with uniform excitation,so it is safe for seismic response analysis of soil layer site of this engineering under the uniform excitation of seismic wave.
引文
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[2]杨燕,楼梦麟.汶川地震中远场深覆盖土层动力反应分析[J].防灾减灾工程学报,2011,31(4):462~468Yang Y,Lou M L.Dynamic Response Analysis of Farfield Soil Layer with Deep Deposit During Wenchuan Earthquake[J].Journal of Disaster Prevention and Mitigation Engineering,2011,31(4):462~468(in Chinese)
[3]蔡宏英,周健,李相崧.深厚覆盖软土地层多向地震动力反应分析[J].同济大学学报(自然科学版),2000,28(2):177~182Cai H Y,Zhou J,Li X S.Plasto-elastic Dynamic Response of Horizontally Layered Sites under Multidirectional Earthquake Shaking[J].Journal of Tongji University:Natural Science,2000,28(2):177~182(in Chinese)
[4]潘旦光,楼梦麟.河谷地形对土层地震反应的影响[J].北京科技大学学报,2008,30(11):1217~1222Pan D G,Lou M L.Effect of Valley Topography on the Seismic Responses of Soil Sites[J].Journal of University of Science and Technology Beijing,2008,30(11):1217~1222(in Chinese)
[5]周国良,鲍叶欣,李小军,等.结构动力分析中多点激励问题的研究综述[J].世界地震工程,2009,25(4):25~32Zhou G L,Bao Y X,Li X J,et al.Review on Dynamic Analyses of Structures under Multi-support Excitation[J].World Earthquake Engineering,2009,25(4):25~32(in Chinese)
[6]朱民伟,张巍,李珠,等.考虑行波效应的三维河谷场地长周期地震动响应分析[J].工程抗震与加固改造,2011,33(1):1~5Zhu M W,Zhang W,Li Z,et al.Traveling Wave Effect on the Seismic Response of 3D Valley Topography Site under Long Period Seismic Excitation[J].Earthquake Resistant Engineering and Retrofitting,2011,33(1):1~5(in Chinese)
[7]楼梦麟,潘旦光,范立础.土层地震反应分析中侧向人工边界的影响[J].同济大学学报(自然科学版),2003,31(7):757~761Lou M L,Pan D G,Fan L C.Effect of Vertical Artificial Boundary on Seismic Response of Soil Layer[J].Journal of Tongji University:Natural Science,2003,31(7):757~761(in Chinese)
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