基于实测爆破地震波下的铁路特大桥桥墩动力影响研究

为研究爆破地震波下大跨度桥梁结构的动力学响应问题,以黑岱沟露天矿附近的酸刺沟大桥为背景,对其爆破振动下桥墩进行了振动监测,建立该桥单墩的数值计算模型,应用ANSYS和LS-DYNA软件对桥墩结构自振特性和动力响应进行了数值模拟. 研究结果表明:在输入爆破地震波主频范围为2～5 Hz时,2 Hz爆破地震波对应桥墩响应最明显,地震波峰值振速达到8.71 cm/s时桥墩出现损伤,损伤位置为墩身空心壁偏底部,保证桥墩安全的比例距离为5.79. 

Research on the Dynamic Effect of Long-Span Railway Bridge Pier Based on Real Blasting Seismic Waves

In order to research the dynamics response of the long-span bridge under the blasting seismic wave, the Suancigou bridge nearby Heidaigou open-cast coal mine was taken as an example and a numerical model was developed for its single pier. Through the finite element method software ANSYS and LS-DYNA , the modal and dynamic time history of the pier were simulated. The results show that while the dominant frequency range of input blasting seismic wave is 2~5 Hz, the response of 2 Hz is the most obvious. The pier damage occurs while the peak velocity reaches the 8.71 cm/s, and the damage area is located on the bottom of the pier wall. The safety ratio distance of the bridge pier is 5.79.