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The role of ground motion duration and pulse effects in the collapse of ductile systems

机译：地面运动持续时间和脉冲效应在延展系统塌陷中的作用

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摘要

The seismic collapse capacity of ductile single-degree-of-freedom systems vulnerable to P-Delta effects is investigated by examining the respective influence of ground motion duration and acceleration pulses. The main objective is to provide simple relationships for predicting the duration-dependent collapse capacity of modern ductile systems. A novel procedure is proposed for modifying spectrally equivalent records, such that they are also equivalent in terms of pulses. The effect of duration is firstly assessed, without accounting for pulses, by assembling 101 pairs of long and short records with equivalent spectral response. The systems considered exhibit a trilinear backbone curve with an elastic, hardening and negative stiffness segment. The parameters investigated include the period, negative stiffness slope, ductility and strain hardening, for both bilinear and pinching hysteretic models. Incremental dynamic analysis is employed to determine collapse capacities and derive design collapse capacity spectra. It is shown that up to 60% reduction in collapse capacity can occur due to duration effects for flexible bilinear systems subjected to low levels of P-Delta. A comparative evaluation of intensity measures that account for spectral shape, duration or pulses, is also presented. The influence of pulses, quantified through incremental velocity, is then explicitly considered to modify the long records, such that their pulse distribution matches that of their short spectrally equivalent counterparts. The results show the need to account for pulse effects in order to achieve unbiased estimation of the role of duration in flexible ductile systems, as it can influence the duration-induced reduction in collapse capacity by more than 20%.
机译：通过检查地面运动持续时间和加速脉冲的各自影响，研究了易受p-δ效应的延性单级自由度系统的地震塌陷能力。主要目标是提供简单的关系，以预测现代延性系统的持续时间依赖性塌陷能力。提出了一种用于修改频谱等同物记录的新方法，使得它们在脉冲方面也等同。首先评估持续时间的效果，而不通过用等效光谱响应组装101对长短的记录来计算脉冲。所考虑的系统具有具有弹性，硬化和负刚度段的三轴骨架曲线。研究的参数包括犬齿和夹紧滞后模型的周期，负刚度斜率，延展性和硬化硬化。采用增量动态分析来确定折叠容量和推导设计塌陷容量谱。结果表明，由于对P-DELTA的柔性BILINEAR系统的持续时间效应，可能发生高达60％的塌陷能力。还介绍了沉积频谱形状，持续时间或脉冲的强度测量的比较评估。然后明确地考虑通过增量速度量化的脉冲的影响来修改长记录，使得它们的脉冲分布与其短频谱等效对应物的脉冲分布匹配。结果表明需要考虑脉冲效应，以便在柔性延展体系中持续持续时间的不偏见估计，因为它可以影响坍塌容量的持续时间降低超过20％。

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