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首页> 外文期刊>Bulletin of earthquake engineering >Probabilistic seismic assessment of RC box-girder highway bridges with unequal-height piers subjected to earthquake-induced pounding
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Probabilistic seismic assessment of RC box-girder highway bridges with unequal-height piers subjected to earthquake-induced pounding

机译：不平等高度桥墩对抗抗震诱导冲击的概率地震评估

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摘要

This paper uses the probabilistic seismic assessment to study the effects of pounding and irregularity on the seismic behavior of typical concrete box-girder bridges with four levels of altitudinal irregularity. To extend the results for all bridges in the same class, uncertainty related to the earthquake, structural geometries, and materials are considered. Pounding is likely to take place in two cases: the first one concerns the seat-type abutments, and the second is at the in-span hinge of multi-frame bridges. Accordingly, the present study is an attempt to investigate the behavior of irregular bridges considering the effects of pounding in both cases. In the first case, the effects of changes in the gap size on engineering demand parameters (EDPs) were investigated. Then, correlations between earthquake parameters and the pounding force were evaluated. Furthermore, the pounding force exerted on the abutment was compared for different bridge irregularity levels. In the second part of the paper, the effects of pounding of adjacent bridge segments in the decks of non-continuous bridges were studied for equivalent Two-Degree-of-Freedom structures, for which the probability of non-occurrence was estimated. In the end, the relationship between structural or seismic parameters and the pounding force was evaluated in case of pounding. The results of the study show that the gap size between the abutment and the deck has the highest effect on the abutment passive deformation, pounding force, and base shear. Also, the substructure irregularity of bridges reduces the correlation between the gap size and the EDPs, except for the column ductility. Moreover, decreasing the ratio of periods of the adjacent frames diminishes the effect of the type of the earthquake but increases the probability of pounding.
机译：本文采用概率的地震评估来研究冲击和不规则性对典型混凝土箱梁桥梁的抗震行为，四层的高度不规则性。为了延长同一类别中的所有桥的结果，考虑与地震，结构几何和材料相关的不确定性。砰砰可能发生在两种情况下：第一个涉及座椅型支座，第二个是在跨度铰接的多框架桥架上。因此，本研究表明，考虑到两种情况下撞击的影响，试图研究不规则桥的行为。在第一种情况下，研究了差距大小对工程需求参数（EDP）变化的影响。然后，评估地震参数与冲击力之间的相关性。此外，比较不同桥不规则水平的施加在邻接上的冲击力。在本文的第二部分中，研究了非连续桥甲板中相邻桥接段的效果用于等效两度自由度结构，估计未发生的概率。最后，在冲击的情况下评估结构或地震参数与冲击力之间的关系。研究结果表明，基台与甲板之间的间隙尺寸对邻接无源变形，冲击力和碱剪切具有最高效果。而且，除柱延展性外，桥梁的桥梁的子结构不规则性降低了间隙尺寸和EDP之间的相关性。此外，减少相邻框架的时段的比率减少了地震类型的效果，而是增加了撞击的概率。

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