新型巨子减震结构动力特性研究

Research on Dynamic Characteristic of A New Energy-dissipated Mega-sub Structure

从绿色建筑角度出发,提出以轻型结构为子结构,主子结构之间设置隔震层的新型巨子减震结构。采用轻型结构作为巨子结构的子结构,可以减小结构的总质量,降低地震对结构的作用;同时在子结构底部设置隔震层,能有效地降低子结构的振动响应。为研究该巨子减震结构的动力特性,利用ETABS有限元分析软件,对一典型的42层超高层巨子减震结构进行地震响应分析,并与相应巨子抗震结构进行比较。计算结果表明:该巨子减震结构的自振周期大于巨子抗震结构,底部剪力明显小于巨子抗震结构;巨子减震结构主子结构的侧向位移也明显小于巨子抗震结构。

For the purpose of green building, a new energy-dissipated mega-sub structure is proposed, which is featured by light-weight sub-structures, as well as the isolation layer at the bottom of sub-structures. The applications of the light-weight materials in sub- structures can decrease the structural mass and further reduce the action of earthquake on structures. Moreover, the isolation bearings are capable of reducing response of sub-structures. To investigate the dynamic characteristic of the proposed structure, the seismic response of a typical 42 - story high-rise building in the form of energy-dissipated mega-sub structure is analyzed by using the finite element software ETABS. A comparison is made between the proposed structure and aseismic mega-sub structure. The results show that the frequencies of proposed structure are longer than the corresponding compared structures, while base shear is smaller. Moreover, the lateral displacements of mega- and sub-structures of proposed structure are obviously smaller than compared structure.