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基于振动台模型试验,采用大型软件MARC进行了数值仿真试验,再现了在地震作用下桩基–结构相互作用体系的动力响应。研究结果表明:基础类型变化对高层建筑结构产生的变形影响较大,桩基–结构相互作用体系中上部结构的最大层间剪力和倾覆力矩等都比刚性地基上结构体系的要小,桩基–结构体系中相当一部分地震能量通过支盘扩散到土层中,减小了上部结构的变形能。而刚性地基上结构体系中相当一部分的地震能量则转化为上部结构的变形能,导致结构损伤较大。同时,振动台试验和数值仿真结果表明:支盘桩结构体系的阻尼能较大,能够有效地提高基础和结构体系的抗震和减震能力,降低上部结构在地震作用下的地震响应,对抵御地震、减少地震破坏具有十分重要的意义。
Based on the shaking table model test, large-scale software MARC was used to simulate the dynamic response of the pile-structure interaction system under earthquake action. The results show that the change of foundation type has a great influence on the deformation of tall buildings. The maximum interlaminar shear and overturning moment of the superstructure in the pile-structure interaction system are smaller than that of the rigid foundation. A considerable part of the seismic energy in the foundation-structure system diffuses into the soil through the support plate, reducing the deformation energy of the superstructure. The seismic energy of a considerable part of the structural system on the rigid foundation transforms into the deformation energy of the superstructure, resulting in greater structural damage. At the same time, the results of shaking table test and numerical simulation show that the damping capacity of the branch-pile structure can be greatly improved, which can effectively improve the seismic and damping capacity of foundation and structural system, reduce the seismic response of the superstructure under earthquake action, Earthquake, reduce the destruction of the earthquake is of great significance.