远场长周期地震下高层建筑的地震损伤模型研究

传统高层建筑地震损伤模型不能反映构件极限滞回耗能随累积幅值的改变情况,无法有效确定组合参数,离散性较大。为此,设计一种远场长周期地震下高层建筑的地震损伤模型。针对不同层次高层建筑结构,依据广义力-广义变形曲线,构建变形损伤模型。结合累积能量比、远场长周期地震瞬时输入能比构建能量损伤模型。从变形与能量两方面综合评价损伤,依据钢筋混凝土结构构建最大反应变形与耗损能量的线性组合地震损伤模型,并对其进行改进。实验选用ILA003、ILA048和TCU115三种长周期地震波,计算不同构件和高层建筑结构整体损伤结果,验证所提模型的可靠性。将所提模型应用于实际高层建筑中,发现其实用性强。

Seismic Damage Model of High-rise Buildings under Far-field Long-period Ground Motions

The traditional seismic damage model of high-rise buildings cannot reflect the change of ultimate hysteretic dissipated energy with cumulative amplitude; thus, the parameters cannot be effectively determined. Therefore, in this study, a seismic damage model for high-rise buildings under far-field long-period earthquakes was designed. According to the generalized force-generalized deformation curve, a deformation damage model was constructed for high-rise building structures of different levels. By considering both the cumulative energy ratio and the instantaneous input energy ratio of far-field long-period ground motions, an energy damage model was constructed. Based on a comprehensive evaluation of damage from the aspects of deformation and energy, the linear combination seismic damage model of maximum response deformation and dissipated energy was established and modified. Three long-period seismic waves, namely ILA003, ILA048, and TCU115, were selected to calculate the overall damage results of different components and tall buildings and to verify the reliability of the proposed model. The proposed model was applied in practical tall buildings and found to be practical.