爆炸荷载下不同比例距离H型钢梁的动态响应
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摘要
利用LS-DYNA软件,采用数值分析方法对爆炸荷载作用下不同比例距离的简支H型钢梁的动态响应进行了研究,结果表明,随着比例距离的减小,梁由弹性变形阶段转变为塑性变形阶段.当药量很小时,爆炸点正下方的梁顶翼缘边缘出现塑性变形且随比例距离的减小而增大.由于考虑了钢材的应变率效应,在比例距离较小(药量较大)的爆炸荷载作用下钢材的动态屈服强度提高至静态屈服强度的3倍.
Using LS-DYNA software,the dynamic response of simply supported H-section steel beams with different proportional distances under blast load was studied by numerical analysis method.It is found that with the decrease of proportional distance,the beam changes from elastic deformation stage to plastic deformation stage.When the charge quantity is very small,plastic deformation occurs at the flange edge of the top of the beam just below the explosion point and increases with the decrease of the proportional distance.Considering the strain rate effect of steel,the dynamic yield strength of steel under explosive loading with smaller proportional distance(larger charge) is increased by three times as much as that of static yield strength.
Using LS-DYNA software,the dynamic response of simply supported H-section steel beams with different proportional distances under blast load was studied by numerical analysis method.It is found that with the decrease of proportional distance,the beam changes from elastic deformation stage to plastic deformation stage.When the charge quantity is very small,plastic deformation occurs at the flange edge of the top of the beam just below the explosion point and increases with the decrease of the proportional distance.Considering the strain rate effect of steel,the dynamic yield strength of steel under explosive loading with smaller proportional distance(larger charge) is increased by three times as much as that of static yield strength.
引文
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[2] 热扎H型钢和部分T型钢(GB/T11263-2010)[S].北京:中国计划出版社,2010.
[3] 李忠献,师燕超.建筑结构抗爆分析理论[M].北京:科学出版社,2015.
[4] 阎石,刘蕾,齐宝欣,辛志强,李鹏.爆炸荷载作用下方钢管混凝土柱的动力响应及破坏机理[J].防灾减灾工程学报,2011,31(5):477-482.
[5] 张秀华,段忠东,张春巍.爆炸荷载作用下钢筋混凝土梁的动力响应和破坏过程分析[J].东北林业大学学报,2009,37(4):50-53.
[6] 曲艳东,李鑫,孔祥清,赵倩.空爆载荷作用下钢筋混凝土梁压力场与响应分析[J].混凝土,2016(7):74-87.
[7] 周清,杨秀琴.爆炸波在“交通核”空间的传播规律及超压荷载[J].吉林建筑大学学报,2017,34(3):1-6.
[8] 李伟建,郑晴.爆炸冲击荷载作用下混凝土墙动态响应分析[J].计算机仿真,2016,33(2):27-31.
[9] 李裕春,石党勇,赵远.ANSYS/LS-DYNA 11.0基础理论与工程实践[M].北京:中国水利水电出版社,2008.
[10] 周继凯,庄天文,慕建磊.爆炸荷载下钢筋混凝土框架连续倒坍特性及影响因素研究[J].混凝土,2015(4):5-13.