埋地燃气管道爆炸对桥梁结构安全影响

Research on Safety of Bridge in the Explosion Caused by Embedded Gas Pipeline

受多种因素限制,埋地燃气管道与桥梁结构的水平距离可能小于规范允许值。为了评估埋地燃气管道爆炸对桥梁结构的影响,本文以南沙港铁路桥梁为背景,利用Midas/GTS建立了足尺三维模型,根据爆炸参数化分析结果,对最不利爆炸工况下的桥梁安全状况进行评估,之后提出了桥梁保护措施。研究结果表明:墩顶振动速度与管道压力呈正相关,与爆炸距离呈负相关;在最不利爆炸工况下,墩顶的振动速度仍满足规范要求;在管道与桥梁之间设置泡沫沟槽可以显著减小管道爆炸对桥梁的影响。

Restricted by various factors, the horizontal distance between embedded gas pipeline and bridge is less than the allowable value of specification. To evaluate the pipeline explosion impact on the bridge, a full-scale three-dimensional model is established by Midas/GTS based on the Nansha port railway bridge engineering. According to the explosion parametric analysis results, the safety status of bridge under the most unfavorable explosion condition is evaluated, and then the bridge protection measures are proposed. The research results show that: the vibration velocity of pier top is positively correlated with pipeline pressure and negatively correlated with the explosion distance;under the most unfavorable explosion conditions, the vibration velocity of pier top still meets the requirements of the specification;the foam groove between pipeline and bridge can significantly reduce the impact of pipeline explosion on bridge.