基于ABAQUS的高层隔震剪力墙结构转换梁内力分析

在带转换层的框支剪力墙结构中，应用基底隔震技术，形成带转换层的框支剪力墙隔震体系。在地震作用下，该体系内力传递途径复杂，得到转换梁、上部剪力墙和隔震支座的受力特点和内力变化规律是该类结构体系成功设计的关键。首先利用有限元软件ETABS对高层框支剪力墙隔震结构进行地震反应分析，然后取三维ETABS模型隔震层、转换梁及上部3层剪力墙组成二维ABAQUS简化模型，分别对剪力墙满跨、中跨和边跨布置的转换梁进行分析，研究了转换梁上部剪力墙、转换梁及隔震支座的内力变化规律。结果表明：三维模型结构在地震作用下，上部结构在水平地震作用可以按抗震设防烈度降低1度进行设计，隔震层最大位移满足支座最大容许位移的要求；二维简化模型结构在外荷载作用下，抵抗水平荷载的能力更好；不同布置的剪力墙与转换梁共同作用抵抗外部弯矩和剪力，剪力墙中跨及满跨布置时，转换梁出现应力集中，边跨布置时剪力墙出现应力集中，隔震设计时应对转换梁与剪力墙进行承载能力验算。

Innernal forces analysis of high-rise seismic isolation shear wall structure with transfer beam based on ABAQUS

In order to apply the base-isolation technique to high-rise shear wall structure, the framed shear wall seismic isolation system with transfer story is formed. Under the action of seismic load, the internal force transfer path of the system is complex. The force characteristics of the transfer beam, the upper shear wall and the isolation bearing as well as the law of the internal force variation are the problems that must be solved. In this paper, firstly simplified model of high-rise shear wall structure with isolated with transfer beam is established. Then modeling and detailed analyses of transfer beams with full span, middle span and side span upper shear walls are done. The internal force change rules of the shear wall on transfer beam, transfer beam and rubber isolation bearings are studied. The analysis results demonstrate that the three dimensional structure model is affected by seismic action, the upper structure can be designed by seismic intensity reducing one degree in the horizontal seismic action, and the maximum displacement of the isolation layer meets the requirement of the maximum allowable displacement of the isolation bearings; the two dimensional ABAQUS model has a better ability to resist the horizontal load.The shear walls with different layout and combined with transfer beam can resist the external bending moment and shear force. The stress concentration is found in the transfer beam when the shear wall is arranged in the middle span and full span. The stress concentration is found in the shear wall when the shear wall is placed on the side span of the transfer beam. Bearing capacity of the transfer beam and the shear wall should be considered in the seismic isolation design.