多向地震耦合作用下高耸结构土-结构动力相互研究
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摘要
研究了水平地震与竖向地震耦合作用下,考虑土-结构相互作用以及二阶效应对结构反应的影响。采用集总参数法,推导了结构在竖向地震和水平地震作用下的运动方程,对某高层建筑的地震反应进行了数值分析。结果表明:考虑土-结构相互作用使结构周期延长,变形增大;竖向地震作用使结构的地震反应有不同程度的增加;考虑二阶效应后结构的位移反应以及层间剪力增加。故在设计建筑在软土地基上的高层及高耸结构时,应该考虑结构的重力二阶效应,考虑其对结构的整体稳定性的不利影响。
The influence of soil-structure dynamic interaction on structural responses is investigated. The equations of motion are derived under vertical and horizontal earthquake loadings. The seismic responses of high-rising structure are numerically simulated and the results show that the interaction prolongs the period of the structure and increases the deformation. The vertical earthquake increases the response of the structure to some degree. The displacement and the shear forces between floors are larger if the gravity P-Δ effect is considered. A conclusion is drawn that the gravity P-Δ effect should be considered and it will have adverse effect on the whole stabilization on tall buildings on soft soil.
The influence of soil-structure dynamic interaction on structural responses is investigated. The equations of motion are derived under vertical and horizontal earthquake loadings. The seismic responses of high-rising structure are numerically simulated and the results show that the interaction prolongs the period of the structure and increases the deformation. The vertical earthquake increases the response of the structure to some degree. The displacement and the shear forces between floors are larger if the gravity P-Δ effect is considered. A conclusion is drawn that the gravity P-Δ effect should be considered and it will have adverse effect on the whole stabilization on tall buildings on soft soil.
引文
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[4]Wolf J P.Dynamic soil-structure interaction[M].Prentice Hall:Englewood,N J,1985.
[5]Luco J E,Wong L.Seismic response of foundations embe-ded in a layered half-space[J].Earthquake Engineering and Structural Dynamics,1987,15(2):233―247.
[6]林皋.土与结构动力相互作用[J].世界地震工程,1991,7(1):4―21.Lin Gao.The dynamic Interaction between the soil and the structure[J].World Information on Earthquake Engine-ering,1991,7(1):4―21.(in Chinese)
[7]克拉夫K W,彭津丁.结构动力学[M].北京:科学出版社,1979.Claugh K W,Peng Jinding.Dynamics of structures[M].Beijing:Science Press,1979.(in Chinese)
[8]李铁英.高层建筑结构在地震作用下的竖向振动研究[J].太原工业大学学报,1997,28(增):86―90.Li Tieying.Vertical vibration analysis of high-rise building under seismic loading[J].Journal of Taiyuan University of Technology,1997,28(sup.):86―90.(in Chinese)
[9]俞载道,职洪涛,曹国敖.基础提离、滑移对结构地震反应影响的探讨[J].同济大学学报,1997,25(2):141―146.Yu Zaidao,Zhi Hongtao,Cao Guoao.Study on the effects of base uplifting and sliding on earthquake responses of structures[J].Journal of Tongji University,1997,25(2):141―146.(in Chinese)
[10]Dobry R,Gazetas G.Dynamic response of arbitrarily shaped foundations[J].Geotech J Engrg,ASCE,1986,112(2):109―135.
[11]张延年,刘剑平,刘斌,李艺.多向地震耦合作用下MRD结构的地震反应分析[J].东北大学学报,2005,26(9):897―900.Zhang Yannian,Liu Jianping,Liu Bin,Li Yi.Seismic responses of MRD configuration under coupled action of multi-directional earthquake[J].Journal of Northeastern University,2005,26(9):897―900.(in Chinese)
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