碳纤维布加固砌体填充墙抗近距离小当量炸药爆炸数值模拟研究  

NUMERICAL SIMULATION OF CFRP REINFORCED CONCRETE MASONRY WALL AGAINST SMALL STAND-OFF DISTANCE EXPLOSIVE CHARGE

作　　者：万军[1] WAN Jun(College of Military Education,National University of Defense Technology,Changsha,Hu'nan 410003,China)

机构地区：[1]国防科技大学军事基础教育学院,湖南长沙410003

出　　处：《工程力学》2020年第S01期82-90,共9页Engineering Mechanics

基　　金：国防科技大学预先研究项目:高强度纤维织物加固砌体填充墙的抗爆机理及其优化研究(JC10-09-01)。

摘　　要：该文采用数值模拟方法对碳纤维布加固砌体填充墙抵抗近距离小当量炸药爆炸进行了研究。进行了1/2缩比的砌体填充墙爆炸实验,对文中墙体抗爆分析数值分析方法的有效性进行了检验。建立了实际墙体的有限元模型,采用LS-DYNA程序对单层和多层纤维布加固的砌体填充墙在爆炸荷载作用下的破坏形式进行了分析。研究表明:近距离小当量爆炸时,砌体填充墙的破坏主要表现为爆炸近区的砌块在爆炸荷载的驱动下,撕裂纤维布向后以较高的速度飞散运动;纤维布的破坏主要表现为横向拉伸应力超过强度极限而产生拉伸断裂,并由爆炸近区分别沿水平和垂直方向向周围发展;当纤维布层间粘结能力有限时,难以发挥纤维方向抗拉强度高的优点。The numerical investigation results of concrete masonry unit(CMU)walls reinforced with carbon fiber reinforced polymer(CFRP)subjected to small stand-off distance explosive charge are presented.The 1/2 scale CMU walls were constructed,and the blast experiments were conducted to validate the numerical models which was used to analyze the blast response of the CMU wall reinforced with CFRP by the LS-DYNA explicit finite element code.The failure mechanism of CMU walls reinforced with single CFRP layer and three CFRP layers were investigated.The numerical results indicated that the CMU wall failed due to the blast load deriving the CMU blocks adjacent to the charge to tear up the CFRP sheets and disperse towards the rear of the wall.The failure forms of the CFRP sheets were tensile ruptures due to insufficient transverse tensile strength.The tensile ruptures of CFRP sheets stretched from the center zone to adjacent zones along the horizontal and vertical directions.When the cohesion strength between the CFRP sheets was insufficient,the high strength of CFRP in fiber direction could not be mobilized efficiently.

关 键 词：固体力学 墙体加固 数值模拟 碳纤维布 近距离爆炸 

分 类 号：TU364[建筑科学—结构工程] TU352.1