Regularity classification and corresponding analysis method requirements of horizontally curved bridges with unequal pier heights  

作　　者：Mohammad Jalal Maleki-amin Shahrokh Maalek 

机构地区：[1]School of Civil Engineering,Tehran University,Tehran 11155-4563,Iran [2]Iranian Bridge Engineering Association,Tehran 36481684,Iran

出　　处：《Earthquake Engineering and Engineering Vibration》2023年第2期549-571,共23页地震工程与工程振动（英文刊）

摘　　要：The seismic behavior of horizontally curved bridges,particularly with unequal height piers,is more complicated than that of straight bridges due to their geometric properties.In this study,the seismic responses of several horizontally curved single-column-bent viaducts with various degrees of curvature and different pier heights have been investigated,employing three different analysis approaches:namely,modal pushover analysis,uniform load method,and nonlinear time history analysis.Considering the investigated bridge configurations and utilizing the most common regularity indices,the results indicate that viaducts with 45-degree and 90-degree deck subtended angles can be categorized as regular and moderately irregular,respectively,while the bridges with 180-degree deck subtended angle are found to be highly irregular.Furthermore,the viaducts whose pier heights are asymmetric may be considered as irregular for almost all ranges of the deck subtended angles.The effects of higher transverse and longitudinal modes are discussed and the minimum analysis requirements are identified to assess the seismic response of such bridge configurations for design purposes.Although the Regularity Indices used here are useful tools to distinguish between regular and irregular bridges,further studies are needed to improve their reliability.

关 键 词：horizontally curved bridges unequal height piers pushover analysis regularity index seismic analysis and response 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]