| 高墩大跨桥梁结构的脆弱性分析 |
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| 引用本文： | 李宇,朱晞,杨庆山.高墩大跨桥梁结构的脆弱性分析[J].长安大学学报(自然科学版),2012,32(1):47-51. |
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| 作者姓名： | 李宇 朱晞 杨庆山 |
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| 作者单位： | 1. 长安大学旧桥检测与加固技术交通行业重点实验室,陕西西安,710064
2. 北京交通大学土木建筑工程学院,北京,100044 |
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| 基金项目： | 国家自然科学基金项目(50578007);中央高校基本科研业务费专项资金项目(CHD2011JC003、CHD2011JC004);中国博士后科学基金项目(2011M501429) |
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| 摘 要： | 采用大型有限元分析软件,对中国西南某铁路特大桥8#墩进行了静力弹塑性（Pushover）分析,得到了结构能力曲线,并以谱加速度和残余位移漂移比作为地面运动强度度量参数和工程需求参数,对高墩大跨桥梁结构进行了脆弱性分析。分析结果表明：当其他条件相同时,随着界限状态的提升,结构要达到相同的概率所需的地面运动强度呈递增趋势;当地面运动作用强度相同时,基阶加载模式计算的脆弱性曲线低估了结构的抗震性能,而均布和SRSS组合加载的脆弱性分析又过分高估了结构的抗震能力。
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| 关 键 词： | 桥梁工程 高墩大跨桥梁 抗震性能评估 脆弱性分析 能力谱法 |
Vulnerability analysis of bridge with long-span and high-rise |
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| LI Yu,ZHU Xi,YANG Qing-shan.Vulnerability analysis of bridge with long-span and high-rise[J].JOurnal of Chang’an University:Natural Science Edition,2012,32(1):47-51. |
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| Authors: | LI Yu ZHU Xi YANG Qing-shan |
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| Institution: | 1.Key Laboratory for old Bridge Detection and Reinforcement Technology of the Ministry of Transportation,Chang’an University,Xi’an 710064,Shaanxi,China;2.School of Civil Engineering,Beijing Jiaotong University,Beijing 100044,China) |
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| Abstract: | FEA software was used to do the Pushover analysis for 8# pier of one railway bridge in Southwest China.The structural capacity curve was obtained.The spectral acceleration and residual displacement drift ratio were chosen to be metric parameter of ground motion intensity and engineering demand parameter,the vulnerability analysis about this bridge was carried out.The results show that when the limiting status increase,the ground motion intensity should also be increased in order to reach the same probability,subject to same ground motion intensity,the vulnerability analysis based on first load mode underestimates the seismic performance,the vulnerability analysis based on average load mode and SRSS mode combination overvalues the seismic performance. |
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| Keywords: | bridge engineering bridge with long-span and high-rise seismic performance assessment vulnerability analysis capacity spectrum method |
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