钢管混凝土格栅坝抗冲击性能试验及参数分析

Experimental study and parameter analysis on the shock resistance of concrete filled steel tubular crib dam

为有效减轻泥石流大块石冲击造成的灾害,提出一种钢管混凝土格栅坝.通过固体冲击试验研究该结构的冲击动力响应,总结了结构的响应模式.同时对试验过程进行数值模拟,模拟结果与试验吻合较好.最后利用数值模拟方法对结构进行参数分析,研究桩管套箍系数、撑管径厚比和桩-撑刚度比对结构动力响应的影响.结果表明:结构的典型响应模式可以概括为构件轻微损伤、构件弯曲破坏、连接节点破坏;桩管受冲击时结构能发挥良好的整体耗能作用,而撑管受冲击时结构整体耗能作用不明显;桩管套箍系数、撑管径厚比和桩-撑刚度比对结构动力响应的影响受桩管和撑管外径、壁厚等单因素变化的制约.钢管混凝土格栅坝具有良好的抗冲击性能.

To mitigate disaster caused by the impact of debris flow boulders, a concrete filled steel tubular crib dam was proposed. Solid impact tests were carried out to study the impact dynamic response of the structure, and the response modes of the structure were summarized. The numerical simulation of the test process was performed, and the results were consistent with the test. The parameter analysis of the structure was carried out to study the influence of confinement coefficient of the piles, radius-thickness ratio of the braces, and stiffness ratio of piles and braces on the dynamic response of the structre. Results showed that the typical response modes of the structre included slight damage of member, bending failre of member, and joint failing. The structre perfommd good overall energy dissipation ability when the pile tube was impacted, while overall energy dissipation was not obvious when the brace tube was impacted. The influence of confinement coefficient of the piles, radius-thickness ratio of the braces, and stiffness ratio of piles and braces on the dynamic response of the structure was constrained by the single-factor variation of the diameter and thickness of piles and braces. These findings suggest that the concrete filled steel tubular crib dam provides good impact resistance.