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浙江大学学报(工学版)
浙江大学学报(工学版)
交通与土木工程     
车载下大跨度桥梁动力可靠度评估
鲁乃唯, 罗媛, 汪勤用, Noori Mohammad
1. 东南大学 土木工程学院,江苏 南京 210096; 
2. 长沙理工大学 土木与建筑学院, 湖南 长沙 410114
Dynamic reliability assessment for long-span bridges under vehicle load
LU Nai wei, LUO Yuan, WANG Qin yong, Noori Mohammad
1. School of Civil Engineering, Southeast University, Nanjing 210096, China;
2. School of Civil and Architecture Engineering, Changsha University of Science and Technology, Changsha 410114, China
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摘要：

为了评估大跨度桥梁在车流荷载作用下的适用性,基于某高速公路车流监测数据建立随机车流模型,分析在3种随机车流作用下悬索桥位移的动力可靠度.采用车桥耦合振动分析方法求解桥梁动力响应,以位移首次超越准则估算失效概率,并分析密集车流占有率对桥梁可靠度的影响规律.结果表明：在随机车流作用下,悬索桥主梁动力响应均值的最大值位于跨中位置,响应均方根最大值位于1/4跨径位置|大跨度桥梁运营期位移超限的适用性可靠度与密集车流的占有率相关|随机车流荷载模型包含车流的概率特征,可用于大跨度桥梁动力响应的概率建模,且在桥梁动力可靠度评估中有一定的适用性.
Abstract:

The dynamic reliability of a suspension bridge under three types of stochastic traffic flow loads were analyzed in order to evaluate the serviceability of longspan bridges under traffic flow loads. The stochastic traffic flows were ebtabilished based on the site-specific traffic measurements of a highway. The bridge dynamic responses were calculated by utilizing vehicle-bridge couple vibration approach. In addition, the failure proability was estimated by the first-passage criterition. Finally, the influence of busy traffic flow occupacy ratio on the reliability of the bridge was investigated. Numerical results indicate that the maximum mean value of the dynamic response of girder is in the mid-span point of the suspension bridge, while that of the root-mean square is in the quarter-span point; the serviceability reliability of the long-span bridge in service, Which is caused by up-crossing failure of displacement, is associated with the occupancy ratio of busy traffic flows. The stochastic traffic flow load model is appropriate for probabilistic modeling of the dynamic responses of longspan bridges, since the statistics of traffic flows are involved in the load model. Furthermore, the stochastic traffic flow load model has a potential feasibility for dynamic reliability assessment for longspan bridges.
出版日期: 2016-12-08
:  U 448.25  
基金资助:

中国博士后科学基金资助项目(2015M580383)；江苏省博士后科研基金资助项目(1501045B)；东南大学博士后创新人才培养资助项目.
作者简介: 鲁乃唯(1987—),男,博士后,从事桥梁结构可靠度评估研究. ORCID: 0000-0003-3812-0385. E-mail: lunaiweide@163.com
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引用本文:

鲁乃唯, 罗媛, 汪勤用, Noori Mohammad. 车载下大跨度桥梁动力可靠度评估[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2016.12.012.

LU Nai wei, LUO Yuan, WANG Qin yong, Noori Mohammad. Dynamic reliability assessment for long-span bridges under vehicle load. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2016.12.012.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2016.12.012    或    http://www.zjujournals.com/eng/CN/Y2016/V50/I12/2328

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