泥石流冲击荷载下圆钢管的破坏机理分析
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摘要
为研究泥石流冲击荷载下圆钢管构件的破坏机理,利用LS-DYNA对一端固定的圆钢管构件进行数值模拟分析.通过改变钢管的直径、壁厚、撞击点高度,以及冲击物的质量、冲击物的速度等变量,计算了243个工况,并对圆钢管构件的动力响应进行对比分析.结果表明,钢管构件的壁厚、直径越大,则构件的冲击力越大,冲击点处的变形区域越小,产生的位移越小;在不同的撞击高度下,撞击自由端处引起的位移是柱脚位移的2倍,而冲击力相差不大;冲击物的速度、质量越大,则冲击能量越大,冲击力越大,构件局部发生的变形区域更大,整体产生的位移也随之增大.
In order to study the failure mechanism of the round steel pipe component under impact load of debris flow, numerical simulation and analysis of cantilevered component was carried out with LS-DYNA. By means of changing the diameter of steel pipe, wall thickness, height of impact point, and mass and velocity of impacting object, 243 regimes were calculated and their dynamic response was contrasted and analyzed. The result showed that the larger the wall thickness and diameter of the steel pipe component, the larger the impact force would be; the smaller the deformation area at the impact point, the smaller the displacement would be. In different impact height, the displacement induced by the impact at the free end of the cantilevered component would be 2 times of that at the fixed end, while the impact was almost the same. The larger the speed and mass of the impact, the larger the impact energy, impact force, and deformation area at local component part would be, and its integrate displacement would consequently increase.
In order to study the failure mechanism of the round steel pipe component under impact load of debris flow, numerical simulation and analysis of cantilevered component was carried out with LS-DYNA. By means of changing the diameter of steel pipe, wall thickness, height of impact point, and mass and velocity of impacting object, 243 regimes were calculated and their dynamic response was contrasted and analyzed. The result showed that the larger the wall thickness and diameter of the steel pipe component, the larger the impact force would be; the smaller the deformation area at the impact point, the smaller the displacement would be. In different impact height, the displacement induced by the impact at the free end of the cantilevered component would be 2 times of that at the fixed end, while the impact was almost the same. The larger the speed and mass of the impact, the larger the impact energy, impact force, and deformation area at local component part would be, and its integrate displacement would consequently increase.
引文
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[4] 王朋.泥石流作用下钢管混凝土桩林结构动力响应分析与试验研究 [D].兰州:兰州理工大学,2016.
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[11] 王生贵,李小利,宋小卫,等.Q420高强度钢管承载能力试验研究 [J].建筑结构,2017,47(19):102-107.
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