Dynamic Response Analysis of Long-Span Continuous Bridge Considering the Effect of Train Speeds and Earthquakes
Dynamic Response Analysis of Long-Span Continuous Bridge Considering the Effect of Train Speeds and Earthquakes
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DOI：
10.1142/s0219455420400131
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发表时间：
2020-06
影响因子：
3.6
通讯作者：
Xin-jun Gao;Peng Duan;H. Qian
中科院分区：
文献类型：
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作者：
Xin-jun Gao;Peng Duan;H. Qian
本文同时对大跨连续桥在地震和列车荷载作用下的动力响应进行了分析。为了清晰地揭示车辆与公路大跨连续桥梁之间的振动耦合机理，利用有限元软件建立了倾斜地震波作用下包括地基、车辆和桥梁在内的数值模型。对不同波浪入射角和不同列车速度下桥梁的动力响应进行了数值分析。结果表明：波浪入射角对桥梁动力响应有显著影响，随着波浪入射角的增大，跨中竖向位移、速度和加速度不断增大；虽然桥梁的动力响应并不总是随着列车速度的增加而增加，但在一定的列车速度下，桥梁的动力响应将达到最大值。考虑结构-土动力相互作用时，随着列车速度的增加，跨中点竖向位移增大，跨中弯矩减小。研究结果可为保证地震作用下桥梁上列车的安全运行提供重要参考。
In this paper, the dynamic response analysis of long-span continuous bridge under earthquake and train load was simultaneously performed. In order to clearly reveal the mechanism of vibration coupling between vehicles and highway long-span continuous bridge, a numerical model including soil foundation, vehicle and bridge under inclined seismic wave was established utilizing finite element software. The dynamic response of the bridge with different wave incident angles and different train speeds was numerically analyzed. The results show that the wave incident angles have a significant effect on the dynamic response of the bridge, and with the increasing of the wave incident angle, the vertical displacement and velocity as well as the acceleration of mid-span constantly increase. While the dynamic response of the bridge does not increase always with the increasing of train speed, however, at a certain train speed, the dynamic response will reach the maximum. With the increasing of the train speed, the vertical displacements of mid-span points increase while the moments at mid-span reduce significantly when the soil–structure dynamic interaction was considered. The results can provide significant references to ensure the train safe running on the bridges under the earthquake.