A study on live load factor considering actual traffic load for evaluation of existing bridges
A study on live load factor considering actual traffic load for evaluation of existing bridges
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考虑实际交通荷载的既有桥梁活荷载系数研究
DOI：
10.11532/structcivil.69a.58
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发表时间：
2023
期刊：
影响因子：
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通讯作者：
時田 英夫
中科院分区：
文献类型：
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作者：
笠松 徹;奥井 義昭;木村 正志;狩野 亮太;佐久間 智;時田 英夫
虽然目前桥梁设计中采用的是B型活载，但在以往的设计规范中，仍有相当多的桥梁采用TL-20进行设计。这些既有不符合规范的桥梁，大多数似乎是在承载能力不足，根据现行的设计规范。在这项研究中，提出了一种基于现有桥梁实际交通数据的现场活载系数评估程序。两个特定地点的交通数据和三个不同的梁桥估计活载系数为现有桥梁的案例研究的例子。该方法利用交通流模拟和广义极值分布函数。现有桥梁最大弯矩的重现期被分配到两个桥梁定期检查的时间间隔。
Although B-live load is applied to bridge designs at present, considerable bridges had been designed with TL-20 in the previous design specifications. Most of these existing non-conformed bridges seem to be insufficient in load-carrying capacity under the current design code. In this study, a procedure for evaluating site-specific live load factors based on the actual traffic data for existing bridges is proposed. Two site-specific traffic data and three different girder bridges are employed to estimate live load factors for existing bridges as case study examples. The proposed method utilizes traffic-flow simulation and the generalized extreme-value distribution functions. The return period of the maximum bending moment for existing bridges is assigned to two intervals of the periodic bridge inspection.