Hariri Bashar, Lin Lan
Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC H3G 1M8 Canada.
Department of Building, Civil and Environmental Engineering, Concordia University, 1455 de Maisonneuve Blvd, W., EV006.245, Montreal, QC H3G 1M8 Canada.
Int J Concr Struct Mater. 2021;15(1):12. doi: 10.1186/s40069-020-00450-9. Epub 2021 Feb 4.
The purpose of this study is to examine the effects of the seismic wave velocity on vertical displacement of a cable-stayed bridge's deck under asynchronous excitation. The Quincy Bayview Bridge located in Illinois, USA, and four other generic bridges are selected for the study. Ten records obtained from earthquakes in US, Japan, and Taiwan are used as input for the seismic excitation in the time-history analysis. Two equations are proposed in this study to determine a critical seismic wave velocity that would produce the greatest vertical deck displacement. The critical wave velocity depends on the total length of the bridge, the fundamental period of the bridge, and the . The in this study is 0.72, which is based on analyzed results from the five selected bridges. The two equations and the are verified through application on two 3-span cable-stayed bridges studied previously by Nazmy and Abdel-Ghaffar. The proposed C-factor of 0.72 is recommended for use for typical 3-span cable-stayed bridges with a side-to-main span ratio of about 0.48. The methodology developed in the study, however, can be applied to any specific bridge to examine the excitation of the deck vertical displacement under the longitudinal seismic ground motion.
本研究的目的是研究地震波速度对斜拉桥桥面在异步激励下垂直位移的影响。选取了位于美国伊利诺伊州的昆西湾景桥以及其他四座通用桥梁进行研究。在时程分析中，使用从美国、日本和台湾地区地震中获取的十条记录作为地震激励的输入。本研究提出了两个方程，以确定能产生最大桥面垂直位移的临界地震波速度。临界波速取决于桥梁的总长度、桥梁的基本周期以及……本研究中的……为0.72，这是基于对五座选定桥梁的分析结果得出的。通过应用于Nazmy和Abdel - Ghaffar之前研究的两座三跨斜拉桥，对这两个方程和……进行了验证。建议对于边跨与主跨之比约为0.48的典型三跨斜拉桥，使用所提出的0.72的C因子。然而，本研究中开发的方法可应用于任何特定桥梁，以研究纵向地震地面运动作用下桥面垂直位移的激励情况。
