地震研究

为研究考虑内力状态的连续刚构桥的地震反应及易损性情况,以一座非规则大跨高墩连续刚构桥为对象,基于MIDAS/Civil和OpenSees平台分别进行施工过程模拟和非线性动力分析,并采用等效荷载法将内力等效荷载附加到OpenSees模型上,使其处于对应的等效内力状态; 选取40组典型的速度脉冲型近断层地震动记录为输入,采用增量动力分析法进行考虑内力状态的地震易损性分析,对比分析了考虑内力状态与否对连续刚构桥地震易损性的影响。结果表明:所采用的内力等效荷载方法能够较好地考虑成桥内力状态; 考虑内力状态与否对成桥阶段主墩和引桥墩的地震易损性具有很大影响,不考虑内力状态时将严重低估主墩和引桥墩的地震损伤概率。

To investigate seismic fragility of the continuous,rigid-frame bridge involving internal force state,an irregular,long-span,continuous,rigid-frame bridge with high piers was selected as the background project.The simulation of construction process and the analysis of nonlinear dynamic were carried out by using MIDAS/Civil and OpenSees platforms.Then an equivalent load method was used to apply the equivalent loads of internal force to the OpenSees model.Forty groups of typical near-fault ground motion records were selected for input,then the seismic fragility of the bridge with additional equivalent loads was analyzed through OpenSees by the Incremental Dynamic Analysis method.Finally,the influence of internal force state on the seismic fragility of the continuous,rigid-frame bridge was compared and analyzed.The results show that the state of the internal force of the main bridge can be accurately calculated and simulated by the formulas for the equivalent loads of the internal force,and the seismic fragility of the main piers and approach piers is affected by the state of the internal force.If the state of the internal force is not taken into consideration,the seismic damage probability of the main pier and the approach pier will be underestimated.

引言
1 分析模型及内力状态
2 地震易损性分析方法
3 地震易损性分析
4 结论

图1 大跨高墩连续刚构桥的构造形式<br/>Fig.1 Structure of the long-span,continuous,rigid-frame bridge

图1 大跨高墩连续刚构桥的构造形式
Fig.1 Structure of the long-span,continuous,rigid-frame bridge

表1 基于MIDAS/Civil软件建立的全桥有限元模型<br/>Tab.1 Finite element models of the whole bridge based on MIDAS/Civil softwere

表1 基于MIDAS/Civil软件建立的全桥有限元模型
Tab.1 Finite element models of the whole bridge based on MIDAS/Civil softwere

图2 基于OpenSees的全桥动力分析模型<br/>Fig.2 The dynamic model of the whole bridge based on OpenSees

图2 基于OpenSees的全桥动力分析模型
Fig.2 The dynamic model of the whole bridge based on OpenSees

表2 单个支座的力学参数<br/>Tab.2 Parameters of the single bearing at each pier

表2 单个支座的力学参数
Tab.2 Parameters of the single bearing at each pier

表3 前5阶自振周期<br/>Tab.3 The first 5-order natural vibration periods

表3 前5阶自振周期
Tab.3 The first 5-order natural vibration periods

图3 主桥的内力等效荷载附加示意图<br/>Fig.3 Equivalent load applied to the main bridge

图3 主桥的内力等效荷载附加示意图
Fig.3 Equivalent load applied to the main bridge

图4 模型2中主梁轴力(a)、弯矩(b)等效内力与目标内力对比<br/>Fig.4 The axial force of the main girder and its equivalent internal force(a)and the bending moment of the main girder and its equivalent bending moment(b)by Model 2

图4 模型2中主梁轴力(a)、弯矩(b)等效内力与目标内力对比
Fig.4 The axial force of the main girder and its equivalent internal force(a)and the bending moment of the main girder and its equivalent bending moment(b)by Model 2

表4 由位移延性系数定义的桥梁损伤状态<br/>Tab.4 Damage state of the bridge defined by the displacement ductility ratio

表4 由位移延性系数定义的桥梁损伤状态
Tab.4 Damage state of the bridge defined by the displacement ductility ratio

表5 桥墩曲率延性指标及损伤界限值<br/>Tab.5 Curvature ductility indexes and the limit values of damage of pier

表5 桥墩曲率延性指标及损伤界限值
Tab.5 Curvature ductility indexes and the limit values of damage of pier

图5 部分桥墩沿纵桥向(a)、横桥向(b)的回归分析<br/>Fig.5 Regression analysis of partial piers along longitudinal(a)and transverse(b)direction

图5 部分桥墩沿纵桥向(a)、横桥向(b)的回归分析
Fig.5 Regression analysis of partial piers along longitudinal(a)and transverse(b)direction

图6 主墩各损伤状态的易损性曲线<br/>Fig.6 Vulnerability curves of the main piers in damage states

图6 主墩各损伤状态的易损性曲线
Fig.6 Vulnerability curves of the main piers in damage states

图7 引桥墩各损伤状态的易损性曲线<br/>Fig.7 Vulnerability curves of the approach pier in damage states

图7 引桥墩各损伤状态的易损性曲线
Fig.7 Vulnerability curves of the approach pier in damage states

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备注

引言

1 分析模型及内力状态

2 地震易损性分析方法

3 地震易损性分析

4 结论

期刊信息