压实系数对内填砂卵石薄壁方钢管柱在冲击载荷下力学性能的影响分析

发布时间：2018-10-17 10:06

【摘要】：利用落锤冲击装置完成了不同压实系数下内填砂卵石薄壁方钢管柱侧向冲击试验,试验中记录了冲击力时程曲线,并获得了试件的破坏形态以及残余变形量。基于剩余承载力损伤评估准则,定义损伤度来判定冲击荷载下内填砂卵石薄壁方钢管柱损伤破坏程度,分析压实系数与柱损伤度的关系。试验结果表明:试件在侧向冲击荷载作用下,主要以局部破坏为主,并伴有一定量的整体弯曲变形;除了试件塑性变形中产生的塑性铰能消耗部分冲击能量外,内填砂卵石也能耗散一部分冲击能量,且压实越紧密,能量消耗越多,该组合柱表现出了较好的抗冲击性能;在一定压实系数范围内,损伤度随着压实系数增大出现先增大后减小的趋势,且砂卵石离散程度越小,损伤度的变化速率就越大。
[Abstract]:The lateral impact test of thin-walled square steel pipe string filled with sand and pebble under different compaction coefficients was carried out by using drop hammer impact device. The time history curve of impact force was recorded and the failure mode and residual deformation of the specimen were obtained. Based on the damage assessment criterion of residual bearing capacity, the damage degree is defined to determine the damage degree of thin-walled square steel pipe string filled with sand and gravel under impact load, and the relationship between compaction coefficient and damage degree of column is analyzed. The experimental results show that the local failure of the specimen is mainly caused by lateral impact load, with a certain amount of integral bending deformation, except that the plastic hinge produced in the plastic deformation of the specimen consumes part of the impact energy. The inner sand pebbles also dissipate part of the impact energy, and the compaction is closer, the energy consumption is more, the composite column shows better impact resistance, and in a certain compaction coefficient range, The damage degree increases first and then decreases with the increase of compaction coefficient, and the smaller the sand pebble dispersion, the greater the change rate of damage degree.
【作者单位】：西南科技大学土木工程与建筑学院;
【基金】：国家自然科学基金(51308479) 四川省科技创新苗子工程(2015034) 西南科技大学研究生创新基金资助(14YCX097)
【分类号】：TU398.9

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