筏板厚度对双塔楼大底盘高层建筑地震反应的影响
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摘要
考虑土-结构动力相互作用,建立了双塔楼大底盘高层建筑动力响应分析的三维有限元模型,研究了筏板厚度变化对结构振动特性和地震响应的影响。不同筏板厚度结构动力响应的对比分析结果表明,随着筏板厚度增加,结构主振周期呈减小趋势,地震侧移呈增加趋势,地震剪力在塔楼部分呈增加趋势但在地下室部分呈减小趋势。筏板的动挠度除在两塔楼外侧的边跨范围内,一般随板厚增加而减小,动弯矩除靠近地下室外墙局部范围内,一般则随板厚增加而增加。可见,筏板厚度并非越大越安全,应在满足承载力和冲切等基本要求的前提下经过优选后确定。
The three dimensional FEM models are constructed to analyze the effects of raft thickness on the vibration characteristics and seismic responses of the twin-towers high-rise building structures with enlarged base,and the dynamic soil-structure interaction is incorporated in the analysis as well.The dynamic responses are obtained and compared for different raft thickness with a dual-axial symmetric twin-towers structure.It is shown that the predominant periods of the structure decrease,the seismic lateral displacements increase,and the seismic forces increase in the upper towers and decrease in the basements with increasing of the raft thickness.While in the raft, with increasing of raft thickness,the displacements decrease except in the outside frame of the towers and the moments increase except in the loxal adjacent to retailing wall of basement.It can be concluded that larger raft thickness cannot guarantee much more safety for the structures.So the raft should be designed with an optimized analysis on the precondition matching the bearing capacity and punching shear resistance.
The three dimensional FEM models are constructed to analyze the effects of raft thickness on the vibration characteristics and seismic responses of the twin-towers high-rise building structures with enlarged base,and the dynamic soil-structure interaction is incorporated in the analysis as well.The dynamic responses are obtained and compared for different raft thickness with a dual-axial symmetric twin-towers structure.It is shown that the predominant periods of the structure decrease,the seismic lateral displacements increase,and the seismic forces increase in the upper towers and decrease in the basements with increasing of the raft thickness.While in the raft, with increasing of raft thickness,the displacements decrease except in the outside frame of the towers and the moments increase except in the loxal adjacent to retailing wall of basement.It can be concluded that larger raft thickness cannot guarantee much more safety for the structures.So the raft should be designed with an optimized analysis on the precondition matching the bearing capacity and punching shear resistance.
引文
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[2]GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[3]吴耀辉,娄宇,李爱群.多塔楼大底盘结构抗震分析研究进展[J].建筑结构,2003,33(9):16-19.
[4]包世华,王建东.多塔楼大底盘结构的振动计算[J].建筑结构,1996,26(6):3-9.
[5]范重,吴学敏.带有双塔楼高层建筑结构动力特性分析[J].建筑结构学报,1996,17(6):11-18.
[6]杨学林,益德清.多塔楼高层结构振动特性与抗震设计[J].工程力学,2001,18(2):76-80.
[7]方鄂华,韦宇宁.多塔楼大底盘结构地震反应[J].建筑结构学报,1995,16(6):3-10.
[8]薛彦涛,魏琏.底部整体裙房上部多塔结构地震反应分析[J].建筑结构学报,1989,10(6):21-29.
[9]娄宇,程辉,施昌.大底盘上对称多塔楼高层建筑的振动分析[J].建筑结构,2001,31(4):13-15.
[10]刘晶波,李彬.三维粘弹性静-动力统一人工边界[J].中国科学(E辑),2005,35(9):966-980.
[11]刘晶波,王振宇,杜修力,等.波动问题中的三维时域粘弹性人工边界[J].工程力学,2005,22(6):46-51.
[12]周友,徐礼华,龚建伍.高层建筑物-桩筏基础-地基相互作用体系的计算分析[J].建筑技术开发,2003,30(8):32-39.
[13]赵锡宏,等.带裙房的高层建筑与地基基础共同作用的设计理论与实践[M].上海:同济大学出版社,1999.
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