双柱式高墩桥梁地震响应结构参数影响分析-公路交通科技.pdf

28 3 Vol28 o3 2011 3 Journal ofH ighway and Transportation Research and Development M ar. 2011 : 1002- 0268 ( 2011) 03- 0067- 09 高玉峰, 施 洲, 秦世强 ( , 610031) : 以西南山区高速公路常用的双柱式高墩桥梁为研究对象, 建立了考虑支座与 下部结构耦联的空间动力分析 模型, 通过大量分析计算, 分别详细讨论了墩高变化桩土作用单联与多联模型单联不同跨数单联与单墩模 型以及地形条件等参数对地震响应结果的影响程度与规律结果表明: 桩底简化固结模型可以适用于常规设计; 单 联模型可用于纵向地震反应分析, 而对于横向地震反应分析宜采用多联模型; 单联不同跨数模型对计算结果影响较 小; 采用单墩模型进行纵向地震反应计算的结果总体 偏于不安全; 不同地形条件对桥墩的地震作用影响较大 : 桥梁工程; 双柱式高墩桥; 地震响应; 反应谱; 参数分析; 地形条件 + : U4425 5 : A Analysis of Structura lParameters Influencing Seismic Response of Doublecolumn Bridge w ith H igh Piers GAO Yufeng, SH I Zhou, QI Shiqiang ( School ofCivilEngineering, Southwest Jiaotong University, Chengdu Sichuan 610031, China) Abstract: In order to research doublecolumn highway bridgew ith high piers in southwestmountain area, the spatial dynam ic model considering the coupling of bearings, superstructures and substructures was established. The effects of some structural param eters on bridge seism ic responses were studied in detail respectively. These parameters include height of piers, pilesoil interaction, singlesegment and multi segmentsmodels, singlesegmentmodelw ith different span numbers, singlesegment and singlepiermodel, and terrain conditions. The results show that ( 1) the smi ply fixed pile bottom model can be used for conventional design; ( 2) the singlesegmentmodel can be used for longitudinal seism ic response analysis, whilemultisegm ents model should be adopted for transversal seism ic response analysis; ( 3) the single segmentmodelw ith different span numbers has negligible influence on analysis results; ( 4) the results of longitud