竖向地震作用下双塔连体结构非线性时程分析
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摘要
地震作用下双塔连体结构体系的变形和内力分布较为复杂,结构中设置的连体部分在一定程度上会提高竖向地震作用对结构的影响。针对某一顶部连体双塔结构,采用NosaCAD有限元软件建立结构的整体非线性分析模型。对计算模型进行输入水平向、竖直向地震波和只输入水平向地震波两种不同工况的动力时程分析,通过对比两种工况下结构的动力响应,研究竖向地震对该连体结构地震反应的影响。分析表明:竖向地震作用对结构的水平位移基本没有影响,对结构竖向位移有一定影响,但影响较小;竖向地震作用对连体部分跨中杆件的内力有一定影响。
The deformations and the internal forces of the multi-tower connected structure(MTCS) under earthquake are very complicated.The effect of vertical seismic motion to the MTCS will be magnified in a certain extent for the connecting structure.The model of a MTCS was established by NosaCAD,which mainly composed of the nonlinear elements.The analysis of the structure model was carried out in two cases of seismic wave input,one with both horizontal and vertical wave inputs and the other with horizontal input only.By comparing the results of the structure response under two cases,the effect of vertical seismic motion to the MTCS was investigated.The results show that the vertical seismic has no effect on the horizontal displacement of the structure and little effect on the vertical displacement of the structure.The vertical seismic has some influence on the internal forces in the middle of the connecting structure.
The deformations and the internal forces of the multi-tower connected structure(MTCS) under earthquake are very complicated.The effect of vertical seismic motion to the MTCS will be magnified in a certain extent for the connecting structure.The model of a MTCS was established by NosaCAD,which mainly composed of the nonlinear elements.The analysis of the structure model was carried out in two cases of seismic wave input,one with both horizontal and vertical wave inputs and the other with horizontal input only.By comparing the results of the structure response under two cases,the effect of vertical seismic motion to the MTCS was investigated.The results show that the vertical seismic has no effect on the horizontal displacement of the structure and little effect on the vertical displacement of the structure.The vertical seismic has some influence on the internal forces in the middle of the connecting structure.
引文
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[2]JGJ3—2002高层建筑混凝土结构技术规程[S].北京:中国建筑工业出版社,2002.
[3]GB50011—2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[4]同济大学土木工程防灾国家重点实验室.舟山市普陀区东港商务中心1、2#楼结构模型模拟地震振动台试验研究报告[R].上海:同济大学,2008.
[5]孙宗鹏,钱江.顶部高位连体结构抗震性能数值模拟分析[J].结构工程师,2009,25(6):93-97.
[6]辛娅云.竖向地震作用的重要性[J].工程抗震与加固改造,2005,12(6):48:50.
[7]顾祥林,孙飞飞.混凝土结构的计算机仿真[M].上海:同济大学出版社,2002.
[8]吕西林.复杂高层建筑结构抗震理论与应用[M].北京:科学出版社,2007.
[9]吕西林,金国芳,吴晓涵.钢筋混凝土结构非线性有限元理论与应用[M].上海:同济大学出版社,2002.
[10]龙志飞,岑松.有限元法新论:原理.程序.进展[M].北京:中国水利水电出版社,2001.
[11]DARWIN D,PECKNOLD D A.Analysis of RC shearpanels under cyclic loading[J].Journal of the StructuralDivision,ASCE,1976,102(2):355-369.
[12]吴晓涵,吕西林.反复荷载下混凝土剪力墙非线性有限元分析[J].同济大学学报,1996,24(2):117-123.
[13]傅金华.建筑抗震设计及实例——建筑结构的设计及弹塑性反应分析[M].北京:中国建筑工业出版社,2008.
[14]孙方涛,吴晓涵,吕西林.竖向地震作用下某大跨悬挑结构反应分析[J].结构工程师,2009,25(4):71-77.
[15]吴晓涵,骆剑锋,马莉.竖向地震作用下混凝土框架结构抗震性能研究[J].结构工程师,2006,22(6):37-43.
[16]熊伟,韩建强,吴敏哲.大跨度张弦桁架竖向地震作用下动力特性研究[J].建筑结构,2008,38(2):50-53.
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