爆破冲击荷载作用下连续刚构桥动力响应分析 李云虎，尹万杰，邹辉煌，潘怡宏

Analysis on Dynamic Response of Continuous Rigid-frame Beam Bridge under Blasting Impact Load

摘要:

采用ANSYS有限元软件建立连续梁桥有限元模型，在不同当量和爆破距离条件下，研究桥梁动力响应分析以及损伤分析，通过分析得出结论：在爆炸荷载作用下，挠度随着时间的增加而增大，应力变化随着时间的增大然后减小；相同爆破荷载作用于不同梁截面，动力响应不同，1/2跨中梁高较小，爆破荷载作用后，桥梁截面顶板和底板都出现破坏，而对于1/4跨梁截面高度较高，相同荷载作用后，仅有桥梁顶板出现较大的拉裂破坏；爆破荷载作用下，桥梁的损伤程度与当量值以及爆破距离有关。

Abstract:

ANSYS finite element software is used to establish the finite element model of continuous beam bridge. Under the conditions of different equivalent and blasting distance, the dynamic response analysis and damage analysis of the bridge are studied. Through the analysis, the conclusion shows that under the action of explosion load, the deflection increases with the increase of time, and the stress changes with the increase of time and then decreases. When the same blasting load is applied to the different beam sections, the dynamic response is different. When the height of the 1/2-span middle beam is small, the roof and floor of the bridge section are damaged after the blasting load. When the height of 1/4-span beam section is higher, the bridge roof is only damaged after the same load. Under the blasting load, the damage degree of the bridge is related to the equivalent value and the blasting distance.