Q460高强钢柱在近爆荷载作用下的动力响应研究  

Dynamic response of Q460 high strength steel column under near explosion load

作　　者：张秀华[1] 张唯佳 张宇 ZHANG Xiuhua;ZHANG Weijia;ZHANG Yu(School of Civil Engineering,Northest Forestry University,Harbin 150040,China;School of Architecture and Civil Engineering,Qiqihar University,Qiqihar 161003,China)

机构地区：[1]东北林业大学土木工程学院,哈尔滨150040 [2]齐齐哈尔大学建筑与土木工程学院,黑龙江齐齐哈尔161003

出　　处：《振动与冲击》2022年第3期107-114,147,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(51878130)。

摘　　要：采用有限元软件ANSYS/LS-DYNA,建立钢柱有限元模型,运用流固耦合计算方法,模拟Q460高强钢柱在爆炸荷载作用下的动力响应,在此基础上提出了分段等效三角波计算方法对结构/构件施加爆炸荷载,并对影响钢柱动力响应的主要因素进行数值分析。结果表明:分段等效三角波计算方法和流固耦合方法计算吻合较好,验证了分段等效三角波计算方法的可行性;爆炸冲击波速度快,荷载峰值大,持续时间短,对钢柱的破坏力极强;钢材强度等级越大,钢柱抵抗变形的能力越强;炸药位置越低,柱脚越容易发生剪切破坏;翼缘作为迎爆面更能抵抗爆炸冲击的作用;适当减小翼缘和腹板的宽厚比能增强钢柱抵抗动力荷载的能力。提出的分段等效三角波计算方法为研究抗爆提供进一步参考。Here,the finite element model of steel column was established by using the finite element software ANSYS/LS-DYNA.Dynamic responses of Q460 high-strength steel column under explosion load were simulated by using the fluid-structure interaction calculation method.Then,the piecewise equivalent triangular wave calculation method was proposed to exert explosion load on structure/member,and main factors affecting dynamic responses of the steel column were numerically analyzed.The results showed that the results using the piecewise equivalent triangular wave calculation method agree well with those using the fluid-structure interaction method to verify the feasibility of the piecewise equivalent triangular wave calculation method;blast shock wave has a fast velocity,large peak load,short duration and extremely strong destructive force on the steel column;the higher the steel strength level,the stronger the steel column’s ability to resist deformation;the lower the explosive position,the easier the column foot to have shear failure;the flange taken as the surface to face blast can better resist blast impact;properly reducing the width-thickness ratio of flange and web can enhance the ability of steel column to resist dynamic load;the proposed piecewise equivalent triangular wave calculation method can further provide a reference for studying anti-explosion.

关 键 词：高强钢柱 爆炸荷载 分段等效三角波 动力响应 数值分析 

分 类 号：TU391[建筑科学—结构工程]