Dynamic analysis of a large span specially shaped hybrid girder bridge with concrete-filled steel tube arches
Dynamic analysis of a large span specially shaped hybrid girder bridge with concrete-filled steel tube arches
复制标题
DOI：
10.1016/j.engstruct.2015.10.026
复制
发表时间：
2016-01-01
影响因子：
5.5
通讯作者：
Liu, Jiafeng
中科院分区：
文献类型：
--
作者：
Li, Yan;Cai, C. S.;Liu, Jiafeng
本文采用试验和数值模拟相结合的方法研究了一座钢管混凝土拱组合梁桥在车辆荷载作用下的动力特性。在该桥正式通车前，进行了现场动力试验。建立了一个精细的三维有限元模型，以反映桥梁复杂的结构力学性能。建立了16自由度车辆模型的车桥耦合振动模型，模拟了车辆作用下桥梁的动力特性。利用上述实测数据，对有限元模型进行了更新，并对桥梁的VBCV模型进行了验证。结果表明，所提出的VBCV数值模型可以很好地再现实测响应，可以用于模拟桥梁在各种条件下的动力行为。采用数值模拟和试验测试相结合的方法，研究了车辆对桥梁的冲击效应、行车舒适性和行人舒适性以及相关参数的影响。结果表明，现行规范中的冲击系数计算公式严重低估了桥梁的动力冲击效应，对桥梁的安全性可能产生不利影响。最后对该桥型的研究工作进行了展望。(C)2015爱思唯尔有限公司版权所有。
In the present study, the dynamic property of a specially shaped hybrid girder bridge with concrete-filled steel tube (CSFT) arches is investigated based on experimental and numerical methods, especially under moving vehicles. Before the inauguration of this bridge, a dynamic field test was conducted. A refined three-dimensional finite element model is built to represent the complex structural mechanic property of the bridge. The vehicle-bridge coupled vibration (VBCV) model with a 16 DOF vehicle model is established to simulate the dynamic behavior of the bridge with moving vehicles. The FE model is updated, and the VBCV model for the bridge is verified, taking advantage of the aforementioned measured data. The result indicates that the proposed VBCV numerical model can closely reproduce the measured response and can be used to simulate the dynamic behavior of the bridge under various conditions. The impact effect, ride and pedestrian comfort, and related parameters analysis for the bridge with moving vehicles are studied by numerical simulations and experimental tests. The results indicate that the impact factor formula from design standards significantly underestimates the dynamic impact effect, which may result in an unfavorable influence on the bridge safety. Several conclusions are drawn for this bridge, and further research that is needed for this new bridge type is discussed. (C) 2015 Elsevier Ltd. All rights reserved.