支座嵌固式与可拆卸式防撞柱撞击试验研究
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摘要
防撞柱主要用于建筑物防恐体系中,有效降低大型机动车对建筑物和密集人群安全的冲撞伤害。设计了一种支座可拆卸式钢管混凝土防撞柱,并与支座嵌固式钢管混凝土防撞柱的撞击性能进行了试验对比。分别对7根支座嵌固式和6根支座可拆卸式防撞柱进行了水平撞击试验,获得了防撞柱撞击动态视频、撞击力—时程曲线和侧向位移—时程曲线。基于试验结果,对比分析了水平冲击荷载作用下的不同柱脚支座类型防撞柱的运动过程和抗冲击性能,以及抗侧移刚度对防撞柱抗冲击性能的影响。结果表明,相同撞击速度和抗侧移刚度条件下,支座可拆卸式防撞柱抗冲击性能优于嵌固式防撞柱。
The anti-ram bollard is mainly used in the anti-terrorism system, which can reduce the damage on buildings and crowds due to the vehicle impact. A new type of detachable concrete filled steel tube anti-ram bollard was designed and its impact resistance was compared with that of the fixed anti-ram bollard by experiments. 6 detachable anti-ram bollards(DAB) and 7 fixed anti-ram bollards(FAB) were tested under horizontal impact. The collision video, the impact force time-history curves and the lateral displacement time-history curves were obtained. The movement and the impact resistance of the bollard with different supports under horizontal impact loading were analyzed based on the test results, and the impact resistance of bollards with different lateral stiffness was studied. The results show that the property of the DAB is better than the FAB at the same impact velocity and the same lateral stiffness.
The anti-ram bollard is mainly used in the anti-terrorism system, which can reduce the damage on buildings and crowds due to the vehicle impact. A new type of detachable concrete filled steel tube anti-ram bollard was designed and its impact resistance was compared with that of the fixed anti-ram bollard by experiments. 6 detachable anti-ram bollards(DAB) and 7 fixed anti-ram bollards(FAB) were tested under horizontal impact. The collision video, the impact force time-history curves and the lateral displacement time-history curves were obtained. The movement and the impact resistance of the bollard with different supports under horizontal impact loading were analyzed based on the test results, and the impact resistance of bollards with different lateral stiffness was studied. The results show that the property of the DAB is better than the FAB at the same impact velocity and the same lateral stiffness.
引文
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[4]曹轲,李国强,陈素文,等.K4级可自动升降式防撞柱系统性能的数值分析[J].东南大学学报(自然科学版),2016,46(2):353-359.CAO Ke,LI Guoqiang,CHEN Suwen,et al.Numerical investigation of K4-rating auto-lifting anti-ram bollard system[J].Journal of Southeast University(Natural Science),2016,46(2):353-359.
[5]HU Bo,LI Guoqiang,SUN Jianyun.Numerical investigation of K4-rating shallow footing fixed anti-ram bollard system subjected to vehicle impact[J].International Journal of Impact Engineering,2014,63:72-87.
[6]肖岩,陈林,肖果,等.防撞柱实车碰撞性能研究[J].振动与冲击,2013,32(11):1-6.XIAO Yan,CHEN Lin,XIAO Guo,et al.Tests for anti-ram bollards based on truck collision[J].Journal of Vibration and Shock,2013,32(11):1-6.
[7]CHEN Lin,XIAO Yan,XIAO Guo,et al.Test and numerical simulation of truck collision with anti-ram bollards[J].International Journal of Impact Engineering,2015,75:30-39.
[8]Bureau of Diplomatic Security,U.S.Department of State.Revision a.Test method for vehicle crash testing of perimeter barriers and gates:SD-STD-02.01[S].Washington D.C:[s.n.],2003.
[9]雷正保,李丽红,雷沐羲,等.新型柔性护栏碰撞安全性仿真分析及实车验证[J].振动与冲击,2013,32(22):28-31.LEI Zhengbao,LI Lihong,LEI Muxi,et al.Simulation analysis and real car validation for crashworthiness of a new flexible safe fence[J].Journal of Vibration and Shock,2013,32(22):28-31.
[10]龙驭球.结构力学[M].北京:高等教育出版社,2012.
[11]British Standards Institution.Impact test specifications for vehicle security barrier systems[S].[S.l.]:BSI Standards Publication,2013.
[12]DEMARTINO C,WU J G,XIAO Y.Response of sheardeficient reinforced circular RC columns under lateral impact loading[J].International Journal of Impact Engineering,2017,109:196-213.
[13]侯川川,王蕊,韩林海.低速横向冲击下钢管混凝土构件的力学性能研究[J].工程力学,2012,29(1):107-110.HOU Chuanchuan,WANG Rui,HAN Linhai.Performance of concrete-filled steel tubular(CFST)members under low velocity transverse impact[J].Engineering Mechanics,2012,29(1):107-110.
[14]侯川川.低速横向冲击荷载下圆钢管混凝土构件的力学性能研究[D].北京:清华大学,2012
[15]温金鹏,李斌,谭德伟,等.考虑织布弹性的软着陆气囊缓冲特性研究[J].振动与冲击,2010,29(2):79-85.WEN Jinpeng,LI Bin,TAN Dewei,et al.Cushioning characteristics of a soft landing airbag with elastic fabric[J].Journal of Vibration and Shock,2010,29(2):79-85.