Dynamic Response of a Highway Bridge Subjected to Moving Vehicles
Dynamic Response of a Highway Bridge Subjected to Moving Vehicles
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DOI：
10.1061/(asce)1084-0702(2008)13:5(439
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发表时间：
2008-09
影响因子：
3.6
通讯作者：
Hongyi Li;J. Wekezer;L. Kwasniewski
中科院分区：
文献类型：
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作者：
Hongyi Li;J. Wekezer;L. Kwasniewski
在选定的佛罗里达公路桥上进行了几次全尺寸荷载试验。两辆满载的卡车对桥梁进行了动态激励，并记录了选定点的应变、加速度和位移，以研究桥梁的动态响应。将实验数据与简化的车辆和桥梁有限元模型进行比较。车辆被表示为具有11个自由度的三维质量-弹簧-阻尼器系统，桥梁被建模为分别表征板和梁的板和梁单元的组合。运动方程由车辆的物理分量和桥梁的模态分量组成。采用中心差分法求解耦合方程组。研究发现，数值分析与实验数据吻合良好，并成功地解释了测试过程中观察到的临界动力学现象。对试验桥的冲击系数进行了全面的研究。
Several full-scale load tests were performed on a selected Florida highway bridge. The bridge was dynamically excited by two fully loaded trucks, and the strain, acceleration, and displacement at selected points were recorded for the investigation of the bridge’s dynamic response. Experimental data were compared with simplified vehicle and bridge finite-element models. The vehicle was represented as a three-dimensional mass–spring–damper system with 11 degrees of freedom, and the bridge was modeled as a combination of plate and beam elements that characterize the slab and girders, respectively. The equations of motion were formulated with physical components for the vehicle and modal components for the bridge. The coupled equations were solved using a central difference method. It was found that the numerical analysis matched well with the experimental data and was used to successfully explain critical dynamic phenomena observed during the testing. Impact factors for this tested bridge were thoroughly inv...