钢—混凝土组合连续刚构桥墩梁连接节点抗震性能比较研究          下载免费PDF全文

王李麒  林元铮  宗周红  夏坚 《世界地震工程》2018,34(1):031-39

钢-混凝土组合连续刚构桥的关键在于墩梁连接节点,设计了双层钢箱混凝土、钢筋混凝土和钢管混凝土等3种不同类型墩柱的连接节点构造形式。基于OpenSees平台建立了墩柱截面纤维有限元模型,并利用双层钢箱混凝土墩柱拟静力试验结果验证了数值模型的有效性,进而基于纤维有限元模型对3种不同类型墩柱节点进行了非线性滞回性能计算分析。结果表明:纤维模型能够模拟拟静力作用下组合连续刚构桥墩梁连接的滞回性能,双层钢箱混凝土墩柱与钢箱-混凝土组合梁连接节点的整体抗震性能要优于钢筋混凝土墩柱和实心钢管混凝土墩柱与钢箱-混凝土组合梁的连接节点,建议的刚性节点构造合理和传力路径明确,可为钢-混凝土组合连续刚构桥设计提供参考。  相似文献   

Performance‐based grouping methods of bridge classes for regional seismic risk assessment: Application of ANOVA,ANCOVA, and non‐parametric approaches          下载免费PDF全文

Sujith Mangalathu  Jong‐Su Jeon  Jamie E. Padgett  Reginald DesRoches 《地震工程与结构动力学》2017,46(14):2587-2602

One of the key tasks to enable a regional risk assessment is to group structures with similar seismic performances and generate fragility curves representative of the grouped structures. The grouping has been traditionally performed based primarily on engineering judgment and prior experience. This paper (i) presents an overview of various statistical techniques such as analysis of variance, analysis of covariance, and Kruskal–Wallis test for grouping the bridges of similar performance; (ii) compares the groupings that emerge from the various grouping techniques; and (iii) identifies the method that has more statistical power in creating bridge sub‐classes of distinct structural performance. The grouping is achieved by comparing the structural responses of bridge classes obtained from the non‐linear time history analysis of bridges. The relative merits of these grouping techniques are discussed with the case study of box‐girder bridges in California. Copyright © 2017 John Wiley & Sons, Ltd.  相似文献