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Experimental investigation of inelastic bridge response under spatially varying excitations with pounding

机译：冲击作用下空间变化激励下非弹性桥梁响应的实验研究

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摘要

In major earthquakes, bridges can suffer pounding damage due to relative displacement between adjacent bridge structures. The relative displacement can also lead to girder unseating. Spatial variation of ground motions is found to be one of the main causes of relative displacement. Although a large number of research have been conducted on the effect of spatially varying ground motions, they are mainly numerical and focusing on bridge elastic response. Since plastic hinge development of bridge piers is likely to occur under strong earthquakes, investigations of the effect of spatially varying ground motions on the bridge inelastic behavior is essential. This research addresses the inelastic response of a two-segment bridge due to spatially varying ground motion including pounding. The study was performed using shake tables. The plastic deformation of bridge piers were simulated by artificial plastic hinges. Different ground motion coherency losses were considered based on the New Zealand soft soil design spectrum. The results show that spatial variation of ground motions influence the development of pounding and plastic hinge. Research based on elastic bridge structures may overestimate the bridge damage potential due to pounding and unseating.
机译：在大地震中，由于相邻桥梁结构之间的相对位移，桥梁可能遭受重击损坏。相对位移也可能导致箱梁松脱。发现地面运动的空间变化是相对位移的主要原因之一。尽管已对空间变化的地面运动的影响进行了大量研究，但它们主要是数值的，并且着重于桥梁的弹性响应。由于桥梁墩的塑性铰可能在强烈地震下发生，因此研究空间变化的地震动对桥梁非弹性行为的影响至关重要。这项研究解决了两段式桥梁由于空间变化（包括撞击）而产生的非弹性响应。该研究使用摇床进行。用人工塑料铰链模拟桥墩的塑性变形。根据新西兰软土设计谱，考虑了不同的地面运动相干性损失。结果表明，地震动的空间变化会影响冲击和塑性铰的发展。基于弹性桥梁结构的研究可能会高估由于撞击和松动而造成的桥梁破坏潜力。

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