基于桩—土作用的滚石撞击双柱式桥墩动力响应分析

滚石灾害的发生将会影响山区桥梁结构使用状况,有时会导致桥墩偏位和落梁,落梁严重的甚至会造成整个桥梁发生坍塌。鉴于独柱墩、双柱墩在山区桥梁中的应用广泛,运用LS-DYNA对独柱墩、双柱墩受滚石撞击时的结构动力响应进行分析。研究表明:滚石撞击双柱式桥墩的位移响应、钢筋应力、桥墩损伤指标均比独柱式桥墩显著。

Dynamic Response Analysis of Double-column Bridge Piers Impacted by Rolling Stones Based on Pile-Soil Interaction

The occurrence of rolling stones disaste rwill affect the use of bridge structures in mountainous areas, sometimes lead to the deviation of bridge piers and falling beams, and serious falling beams will even cause the collapse of the whole bridge. In view of the wide application of single-column piers and double-column piers in mountain bridges, LS-DYNA is used to analyze the structural dynamic response of single-column piers and double-column piers under the impact of rolling rocks. The results show that the displacement response, reinforcement stress and pier damage index of the double pillar pier are more significant than those of the single pillar pier.