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首页> 外文期刊>Journal of bridge engineering >Shake Table Tests of Tall-Pier Bridges to Evaluate Seismic Performance
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Shake Table Tests of Tall-Pier Bridges to Evaluate Seismic Performance

机译：高耸桥梁的振动台试验以评估抗震性能

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More than 40% of the bridges in mountainous areas of Southwest China are constructed with piers having a height of over 40 m. Such piers are characterized by large structural flexibility and distributed mass. To investigate the effects of higher modes on the seismic performance of this class of bridges, shake table tests on two 1/7-scale, tall-pier models were conducted at Tongji University, Shanghai. This paper describes the design, instrumentation, and loading protocols for the tests and discusses and compares the results. Due to the higher-mode effects, the curvature at the pier base and displacement at the pier top of were found to be weakly correlated, indicating that displacement is not a reliable damage measure for tall piers. Moreover, results indicated that the contribution of higher modes can lead to the formation of an additional plastic region at midheight in the piers. However, current seismic design code guidelines are for short to medium-height piers, where the midheight region of piers is assumed to respond elastically; code guidelines are not provided for tall piers. This paper explores the effect of higher modes on the seismic performance of bridges with tall piers and suggests two methods to improve the seismic performance: (1) eliminating the midheight plastic response by including more longitudinal steel, and (2) using more confinement in the midheight region to improve pier ductility and prevent shear failure.
机译：在中国西南山区，超过40％的桥梁是用高度超过40 m的墩建造的。这样的墩的特征在于大的结构柔性和分布的质量。为了研究较高振型对此类桥梁的抗震性能的影响，在上海同济大学对两个1/7规模的高墩模型进行了振动台试验。本文介绍了测试的设计，检测和加载协议，并讨论和比较了结果。由于存在较高的模态效应，因此发现墩脚底部的曲率和墩脚顶部的位移之间的相关性很弱，这表明位移不是高墩墩的可靠破坏措施。此外，结果表明，较高模态的贡献可导致桥墩中高处形成额外的塑性区域。但是，当前的抗震设计规范指南适用于中低高度的墩，假定墩的中高区域会产生弹性响应。没有为高墩提供规范准则。本文探讨了较高振型对高墩桥梁抗震性能的影响，并提出了两种改善抗震性能的方法：（1）通过增加纵向钢来消除中高塑性响应；（2）在围岩中使用更多约束中高的区域，以提高桥墩的延展性并防止剪切破坏。

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