Field Testing and Performance Evaluation of a Through-Plate Girder Railway Bridge
Field Testing and Performance Evaluation of a Through-Plate Girder Railway Bridge
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铁路贯通板梁桥现场试验及性能评价
DOI：
10.3141/2172-15
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发表时间：
2010
影响因子：
1.7
通讯作者：
Torkul Kanchanalai
中科院分区：
文献类型：
--
作者：
Piya Chotickai;Torkul Kanchanalai
介绍了一座旧贯通板梁铁路桥梁的性能和行为特点。应变测量仪器用于监测当前操作条件下的结构响应。用列车称重系统测量了交叉列车的载荷谱，并将其用作后续有限元模型的外加载荷。试验和分析结果表明，桥梁结构的应力响应主要受轴载和轴距的控制。在桁梁与楼板梁连接处观察到一定程度的连续性。因此，典型的简单剪切连接假设可能会给出不现实的应力响应估计。然而，楼板梁和板梁的结构响应对连接处的连续性程度不太敏感。在Miner假设的基础上，计算了桥梁主要构件的疲劳损伤累积和等效应力循环次数。货运列车虽然具有较大的轴载，但由于其应力循环次数较多，造成的疲劳损伤以客运列车为主。研究发现，每次列车通过的等效循环次数远低于美国铁路工程和道路养护协会的《铁路工程手册》中提供的数值。研究结果为性能和疲劳评估提供了有利的信息。该结构已证明对当前的操作条件具有足够的能力。此外，利用研究结果可以更准确地估计疲劳寿命。
The performance and behavioral characteristics of an old through-plate girder railway bridge are presented. Strain gauge instrumentation was used to monitor structural responses under current operating conditions. Loading spectra of crossing trains were measured with a train weighing system and used as applied loads in subsequent finite element models. The experimental and analytical results indicated that the stress responses of the bridge structure were controlled mainly by axle loads and axle spacings. A certain degree of continuity was observed at the stringer-to-floor-beam connections. Consequently, the typical assumption of simple shear connection could give unrealistic estimates of stress responses in the stringers. The structural responses in floor beams and plate girders were, however, less sensitive to the degree of continuity at the connections. On the basis of Miner's hypothesis, the fatigue damage accumulation and the equivalent number of stress cycles in main bridge members were evaluated. Although freight trains had greater axle loads, the fatigue damage was dominated by passenger trains because of their large number of stress cycles. The equivalent number of cycles per train crossing was found to be considerably less than the value provided in the Manual for Railway Engineering of the American Railway Engineering and Maintenance-of-Way Association. The findings provided favorable information for the performance and fatigue evaluations. The structure was shown to have an adequate capacity for current operating conditions. In addition, use of the research results would provide a more accurate estimate of the fatigue life.