土-框架建筑群动力相互作用有限元模拟分析

Finite element simulation of solid-framed building cluster dynamic interaction

城市建筑越高越密集的发展趋势,对土-高层建筑群的相互作用分析提出了新的理论课题。本文以Davidenkov地基模型作为本构模型,并运用振动台实验实测数据验证该本构模型模拟黏性土动力响应的准确性。在此基础上,运用ANSYS建立土与建筑群动力相互作用的有限元模型,上部结构设计为框架结构,分析土与高层建筑群的动力相互作用对上部结构动力响应的影响,并与单体建筑进行对比。然后改变模型参数,分析上部结构间距和上部结构数量对建筑群动力响应的影响。计算表明,在土-建筑群相互作用体系中,群效应对上部结构的动力响应有影响,群效应使得群内建筑三层以上楼层的绝对加速度峰值、速度峰值都减小,并且平行于震动方向以及中间建筑受群效应影响更为明显;同时,在三层以上时,随着间距的增大,群效应越来越小,随着上部结构的增多,群效应越来越大,但上部建筑不同的布置方位也可能导致不同的结果。

The higher and the denser of urban constructions, lead the new issue of solid-framed building cluster. Davidenkov model is applied as the constitutive model of soft solid foundation, and using shaking table experiment data verify that the constitutive model to simulate the accuracy of the dynamic response of cohesive soil. On this basis, an finite element model of interaction between solid and high-rise building groupe is established by ANSYS, the superstructure is frame structure, analyse the effect of superstructure dynamic response caused by solid and high-rise buildings interaction, and compared with single building, then change model parameters, analyse the influence on superstructure dynamic response caused by different space between superstructures and different number of superstructures,laid the foundation for the design of solid-framed building cluster dynamic interation, the results show that, the dynamic response of building in building cluster is different from individual building, the peak accelera- tion and the peak speed from layer 3 to layer 10 of building in building cluster is decreased, in addition, the effect of building cluster is stronger in the direction parallel to of earthquake.