Load-carrying capacity evaluation of girder bridge using moving vehicle
Load-carrying capacity evaluation of girder bridge using moving vehicle
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DOI：
10.1016/j.engstruct.2020.111645
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发表时间：
2021-02
影响因子：
5.5
通讯作者：
Zhen Sun;D. Siringoringo;Y. Fujino
中科院分区：
文献类型：
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作者：
Zhen Sun;D. Siringoringo;Y. Fujino
有效、可靠地评估缺陷桥梁的承载能力是桥梁养护管理的重要内容。在对既有桥梁承载能力进行评估的基础上，运营商可以制定策略并实施修复、加固或交通管制等对策。目前，桥梁承载能力的评定主要采用静载试验。然而，这种测试通常被认为是昂贵的，需要大规模的交通封闭，这阻碍了在农村地区的高速公路或桥梁上的频繁实施。提出了一种基于车辆移动位移的梁桥承载能力评估方法。该方法包括三个主要步骤，即基于雷达的动态位移测量下的卡车通过测试，影响线提取，估计的位移下的静载试验方案。根据这些程序，按照AASHTO手册进行承载能力评估。通过典型梁桥的三维有限元模型在车辆荷载作用下的数值模拟，验证了该方法的有效性。在数值模拟中研究了车辆重量、车辆速度和路面不平度对位移估计精度的影响。以一座预应力混凝土简支梁桥为例，进行了该方法的全尺寸实施，以验证该方法的可行性，为实际应用提供指导。计算结果表明，该方法能够可靠地估算主梁的荷载额定系数。评价过程也比传统方法更有效和经济。
Efficient and reliable load-carrying capacity evaluation of deficient bridges is essential for bridge maintenance and management. Based on load-carrying capacity evaluation of an existing bridge, operator can formulate strategies and implement countermeasures such as repair, strengthening or traffic regulation. Currently, static load test is used widely for evaluation of bridge load-carrying capacity. The test, however, is often considered expensive and requires massive traffic closure that hinders frequent implementation on highway or bridges in the rural area. In this paper, an efficient method for load-carrying capacity evaluation of girder bridges based on displacement under moving vehicle is proposed. The method consists of three main procedures, namely, radar-based dynamic displacement measurement under truck pass-by test, influence line extraction, and estimation of the displacement under the static load test scenario. Based on these procedures, evaluation of load-carrying capacity is conducted following the AASHTO manual. The method was verified in numerical simulations using three-dimensional finite element model of typical girder bridge under vehicle loading. Effects of vehicle weight, vehicle speed, and road roughness on the accuracy of displacement estimation were investigated in the numerical simulations. Full-scale implementation of the method was conducted on a simply supported prestressed concrete girder bridge to investigate feasibility of the proposed method and to provide guidance for practical application. The results reveal that load rating factor of the girders can be reliably evaluated. The evaluation process was also more effective and economical than the conventional method.