考虑不确定性的山区中小跨径桥梁抗震性能分析
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1.怒江美丽公路绿道建设工程指挥部;2.云南省综合交通发展中心;3.湖南大学土木工程学院

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U448.21

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云南省交通运输厅科技创新及示范项目(2022-82)


Seismic Performance Analysis of Small and Medium Span Bridge Considering Uncertainty
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Nujiang Meili Highway Greenway Construction Engineering Headquarters

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    摘要:

    为探讨中小跨径桥梁在设计、建造及服役期间中典型的不确定性因素对结构抗震性能的影响,本文以一座4跨连续小箱梁桥为工程背景,基于OpenSees建立非线性动力模型,通过易损性分析考虑地震波不确定性、建模参数不确定性和构件抗震能力不确定性对结构地震动响应、构件易损性曲线的建立、构件抗震性能和体系抗震能力的影响规律,并通过考虑不确定因素间的联动效应以量化各类不确定性因素对结构抗震性能分析的影响。结果表明:构件的地震滞回曲线的差异主要由建模参数的不确定性造成,而峰值地震响应差异主要由地震动和建模参数的不确定性联合所导致;建模参数的不确定性和构件抗震能力的不确定性均会导致结构失效概率的增加,继而使得部分构件无法满足既定的损伤状态;考虑不确定性因素会增加桥梁系统易损性曲线的失效概率,且随着损伤程度的加深,不确定性的影响也会越大,使分析结果偏差30%以上。

    Abstract:

    To explore the influence of various uncertainties on the seismic performance of small and medium span bridges during design, construction and service, a four-span continuous small box girder bridge is taken as the engineering background, and a nonlinear dynamic model is built based on OpenSees, the effects of seismic wave uncertainty, modeling parameter uncertainty and component seismic capacity uncertainty on structural seismic response, establishment of component vulnerability curves, component seismic performance and system seismic capacity are considered through fragility analysis, and the effects of various uncertainties on structural seismic performance analysis are quantified by considering the linkage effects among uncertainties. The results show that the differences in the seismic hysteresis curves of the components are mainly caused by the uncertainties of the modeling parameters, while the differences in the peak seismic response are mainly caused by the combined uncertainties of ground shaking and modeling parameters; modeling parameter uncertainty and component seismic capacity uncertainty can lead to an increase in the probability of structural damage, which consequently makes some components unable to meet the required damage state; consideration of the uncertainty factor increases the probability of failure of the bridge system susceptibility curve, and the effect of uncertainty increases as the degree of damage deepens, biasing the analysis results by more than 30 percent.

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马健,熊江东,苏官林,等. 考虑不确定性的山区中小跨径桥梁抗震性能分析[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-04-25
  • 最后修改日期:2024-06-02
  • 录用日期:2024-06-05
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