不同地震波输入机制下的结构振动台模型试验
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摘要
设计了一个10层框架结构,直接置于振动台上进行模型试验.讨论不同输入机制对结构地震反应的影响.在进行了土层自由场、土-结构相互作用体系的振动台试验的基础上,选择三种试验记录作为该模型结构振动台试验的台面输入,分别为先期试验中的振动台输入、自由场试验中的地表记录、土-结构相互作用体系试验中模型结构基础上测得的记录.把试验结果与土-结构相互作用体系的试验结果作对比,讨论不同输入模式的合理性.试验结果表明:不考虑土层因素,直接将基岩波作为输入,与实际误差最大,将自由场的反应作为输入时误差有所减小,而将土-结构体系基础上的反应作为输入时结构反应与实际情况更为接近,但有时会低估结构的反应.
A ten-story frame structure is designed for shaking table model test and the influence of different input mechanisms on the seismic responses of the structure are discussed.Based on the free-field tests and soil-structure interaction tests,three waves are selected and used as shaking table model test inputs.They are records used in the former tests,the soil's surface records obtained from the free-field tests and the foundation response of soil-structure interaction tests respectively.A comparative study is made of the results with those obtained from soil-structure interaction system and a discussion is held on the reasonableness of the different input mechanisms.The test results show that if the bedrock wave is used as input without considering the soil factor,the maximum error may occur;when free field waves are used as input,the error may reduce;if the time history record at the foundation in the soil-structure system test is used as input,the structure response will be much colser to the soil-structure interaction system,but sometimes the structural response may be underestimated.
A ten-story frame structure is designed for shaking table model test and the influence of different input mechanisms on the seismic responses of the structure are discussed.Based on the free-field tests and soil-structure interaction tests,three waves are selected and used as shaking table model test inputs.They are records used in the former tests,the soil's surface records obtained from the free-field tests and the foundation response of soil-structure interaction tests respectively.A comparative study is made of the results with those obtained from soil-structure interaction system and a discussion is held on the reasonableness of the different input mechanisms.The test results show that if the bedrock wave is used as input without considering the soil factor,the maximum error may occur;when free field waves are used as input,the error may reduce;if the time history record at the foundation in the soil-structure system test is used as input,the structure response will be much colser to the soil-structure interaction system,but sometimes the structural response may be underestimated.
引文
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[2]韩飞.考虑土层非线性的土-桩-结构动力相互作用研究[D].上海:同济大学土木工程学院,2007.HAN Fei.Soil-pile-structure dynamic interaction whenconsidering nonlinear soil[D].Shanghai:Tongji University.College of Civil Engineering,2007.
[3]陈跃庆,吕西林,陈波.结构-地基动力相互作用对基底地震动的影响[J].结构工程师,2001(2):14.CHEN Yueqing,LV Xilin,CHEN Bo.effects of soil-structureinteraction on foundation motion[J].Structural Engineers,2001(2):14.
[4]楼梦麟,宗刚,牛伟星,等.土-桩-钢结构相互作用体系的振动台模型试验[J].地震工程与工程振动,2006,26(5):226.LOU Menglin,ZONG Gang,NIU Weixing.Shaking tablemodel test of soil-pile-steel structure interaction system[J].Earthquake Engineering And Engineering Vibration,2006,26(5):226.
[5]陈跃庆,吕西林,李培振,等.不同土性的SSI对基底地震动的影响[J].武汉大学学报:工学版,2005,38(3):63.CHEN Yueqing,LV Xilin,LI Peizhen.Effects of soil-structure interaction with various soils[J].Journal of WuhanUniversity:Engineering and Technology Edition,2005,38(3):63.
[6]王志华,刘汉龙,陈国兴,等.土-结构相互作用效应对结构基底地震动影响的试验研究[J].地震工程与工程振动,2005,25(3):132.WANG Zhihua,LIU Hanlong,CHEN Guoxing,et al.Experiment study on effects of dynamic soil-structureinteraction on foundation motions of structures[J].EarthquakeEngineering And Engineering Vibration,2005,25(3):132.
[7]陈国兴.岩土地震工程学[M].北京:科学出版社,2007.CHEN Guoxing.Geotechnical earthquake engineering[M].Beijing:Science Press,2007.
[8]陈清军,赵云峰,王汉东.不同基础形式下的结构地震动输入研究[J].工程力学,2001(增刊):219.CHEN Qingjun,ZHAO Yunfeng,WANG Handong.Study onground motion input about different foundation type[J].Engineering Mechanics,2001(suppl):219.
[9]陈清军,翁大根,朱合华.确定桩承高层结构有效地震动输入的一种改进模型[J].工程力学,1996(A02):305.CHEN Qingjun,WENG Dagen,ZHU Hehua.A kind ofmodified model about effective ground motion input of pile-supported high-rise structure[J].Engineering Mechanics,1996(A02):305.
[10]杨柏坡,孙茂斌,杨笑梅.关于高层建筑的地震动输入[J].建筑科学,1999,15(3):6.YAGN Baipo,SUN Maobin,YANG Xiaomei.Seismic motioninput for high-rise buildings[J].Building Science,1999,15(3):6.
[11]杨柏坡,窭立军.地震安全性评价和高层建筑的地震动输入[J].地震工程与工程振动,2000,20(1):35.YANG Baipo,DOU Lijun.Seismic safety evaluation and input of earthquake ground motion for tall buildings[J].Earthquake Engineering And Engineering Vibration,2000,20(1):35.
[12]韩军.带深桩基础高层建筑结构地震动输入问题研究[D].重庆:重庆大学土木工程学院,2004.HAN Jun.Study on ground motion input for seismic design oftall buildings with deep pile foundation[D].Chongqing:Chongqing University.College of Civil Engineering,2004.
[13]姬淑艳,韩军,李英民,等.带深桩基础高层建筑结构的地震动输入问题[J],地震工程与工程振,2006,26(5):231.JI Shuyan,HAN Jun,LI Yingmin.Study on ground motionexcitation for seismic design of tall buildings with deep pileibundation[J].Earthquake Engineering And EngineeringVibration,2006,26(5):231.
[14]解振涛,张俊发,高永昭,等.高层建筑结构的输入地震动问题探讨[J].四川建筑科学研究,2007,33:62.XIE Zhentao,ZHANG Junfa,GAO Yongzha,et al.Somediscussion on input seism on tall building[J].Sichuan Building Science,2007,33:62.
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