ABSTRACT

A novel model is constructed to investigate the coupling effect of pulse period (T_p) and peak pulse velocity (V_p) on structural demands with the varied fundamental period (T₁) under pulse-like ground motions. The Gaussian function is proposed to quantitatively describe the bell-shape curve of column ductility demand in terms of ln(T₁/T_p). Further investigation reveals that the two critical parameters of Gaussian function, i.e. the height of the curve’s peak and the position of the center of the peak, are significantly influenced by V_p, and analytically illustrated by Power function and Boltzmann function, respectively. verification of the proposed two-dimensional structure-pulse coupling model exhibits its accuracy and feasibility in predicting the seismic demand conditioned on vector-valued intensity measure ([V_p, ln(T₁/T_p)]) under pulse-like ground motion. Moreover, the coupling model can be used to identify and quantify the response regularity, for instance, the phenomenon that the center position of the peak shifts from 1.0 to 0.5 by increasing V_p is analytically captured in this study. Lastly, the coupling model is also capable to identify the unfavorable range of structural parameters, which is quite practical for near-fault seismic design and risk assessment.

摘要

建立了一个新的模型来研究脉冲周期（T _p）和峰值脉冲速度（V _p ）对结构需求的耦合效应，并在类似脉冲的地震动下具有不同的基本周期（T _{1 ）。}提出高斯函数，以ln( T ₁ / T _p )定量描述柱延性需求的钟形曲线。进一步研究表明，高斯函数的两个关键参数，即曲线峰高和峰中心位置，受V _{p的显着影响。}，并分别由幂函数和玻尔兹曼函数解析说明。对所提出的二维结构-脉冲耦合模型的验证显示了其在脉冲类地震动下以向量值强度测量 ([ V _p , ln( T ₁ / T _p )]) 为条件的地震需求预测的准确性和可行性. 此外，耦合模型可用于识别和量化响应规律，例如通过增加V _{p峰值中心位置从 1.0 偏移到 0.5 的现象。}在本研究中被分析捕获。最后，耦合模型还能够识别结构参数的不利范围，这对于近断层抗震设计和风险评估非常实用。