随机地震动作用下减隔震支座连续梁桥可靠度分析
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摘要
为分析减隔震支座连续梁桥的可靠度,采用双过滤地震动模型模拟地震地面加速度功率谱,运用功率谱法进行减隔震支座连续梁桥的动力反应分析,得到各个减隔震支座的响应峰值统计量;以减隔震支座的相对位移作为控制指标,建立极限状态方程,依据JC法用MATLAB编程计算各减隔震支座的失效概率,并根据串联模式计算减隔震支座连续梁桥的总体失效概率。某4×25m减隔震支座连续梁桥设置板式橡胶支座和铅芯橡胶支座,采用该法进行随机地震动作用下桥梁可靠度分析。结果表明:在Ⅰ～Ⅳ类场地结构响应的变异系数只与结构本身有关;随着场地类别的逐渐不利,结构响应的离散程度越来越大;铅芯橡胶支座的抗震性能明显优于板式橡胶支座。
In order to analyze the reliability of the continuous girder bridge with seismic mitigation and isolation bearings,the double-filter seismic motion model was established to simulate the power spectrum of ground motion acceleration,the power spectrum method was adopted to analyze the dynamic response of the continuous girder bridge with seismic mitigation and isolation bearings,and the statistical value of the peak response of each seismic mitigation and isolation bearing was obtained.With the relative displacement of seismic mitigation and isolation bearing as the control index,the limit state equation was formulated,the MATLAB was used to program and calculate the failure probability of the each bearing based on the JC approach,and the global failure probability of the continuous girder bridge with seismic mitigation and isolation bearings was calculated by using series model.The method aforementioned was used to carry out the reliability analysis of a 4 ×25 m continuous girder bridge outfitted with laminated rubber bearings and lead rubber bearings.The results of the analysis demonstrate that in the Ⅰ~Ⅳ site class,the variation coefficient of dynamic response is only correlated with the structure itself;the discrete degree of dynamic response becomes greater and greater as the ground class grows more and more unfavorable;the seismic performance of the lead rubber bearing is apparently superior to that of the laminated rubber bearing.
In order to analyze the reliability of the continuous girder bridge with seismic mitigation and isolation bearings,the double-filter seismic motion model was established to simulate the power spectrum of ground motion acceleration,the power spectrum method was adopted to analyze the dynamic response of the continuous girder bridge with seismic mitigation and isolation bearings,and the statistical value of the peak response of each seismic mitigation and isolation bearing was obtained.With the relative displacement of seismic mitigation and isolation bearing as the control index,the limit state equation was formulated,the MATLAB was used to program and calculate the failure probability of the each bearing based on the JC approach,and the global failure probability of the continuous girder bridge with seismic mitigation and isolation bearings was calculated by using series model.The method aforementioned was used to carry out the reliability analysis of a 4 ×25 m continuous girder bridge outfitted with laminated rubber bearings and lead rubber bearings.The results of the analysis demonstrate that in the Ⅰ~Ⅳ site class,the variation coefficient of dynamic response is only correlated with the structure itself;the discrete degree of dynamic response becomes greater and greater as the ground class grows more and more unfavorable;the seismic performance of the lead rubber bearing is apparently superior to that of the laminated rubber bearing.
引文
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[3]JTG/T B02-01-2008,公路桥梁抗震设计细则[S].
[4]杜修力.水工建筑物抗震可靠度设计和分析用的随机地震输入模型[J].地震工程与工程振动,1998,18(4):76-81.
[5]林家浩,张亚辉.随机振动的虚拟激励法[M].北京:科学出版社,2004.
[6]赵国藩,金伟良,贡金鑫.结构可靠度理论[M].北京:中国建筑工业出版社,2000.
[7]王光远,朱靖华.地震作用下串、并联工程系统中结构失效相关的近似处理[J].地震工程与工程振动,1998,18(4):1-7.
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