FRP钢管混凝土柱抗爆性能数值模拟  

Numerical Simulation of Blast Resistance of Concrete-filled Steel TubeColumns Confined with FRP

作　　者：赵均海[1] 董婧 张冬芳[1] 李莹萍 ZHAO Jun-hai;DONG Jing;ZHANG Dong-fang;LI Ying-ping(School of Civil Engineering,Chang an University,Xi'an 710061,Shaanxi,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《建筑科学与工程学报》2020年第2期35-43,共9页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51878056);陕西省科技计划项目(2019SF-256);陕西省自然科学基础研究计划项目(2018JQ5119,2018JQ5023)。

摘　　要：为研究FRP钢管混凝土柱(CFST)的抗爆性能,建立了比例距离为0.28 m·kg^-1/3时爆炸荷载下纤维增强复合材料(FRP)钢管混凝土柱的数值模型。运用LS-DYNA非线性有限元程序中的高能爆炸材料模型及状态方程来施加爆炸荷载,采取多物质流固耦合方法进行数值模拟,通过试验数据验证了该模型的合理性。通过数值模拟展示了FRP钢管混凝土柱的位移时程及钢管、混凝土、FRP的等效应力变化,分析了其变化规律与分布特征。此外,通过改变相应参数研究了FRP层数、钢管屈服强度及混凝土强度对FRP钢管混凝土柱的影响程度。结果表明:FRP的约束可以有效提高钢管混凝土的抗爆性能,其易损部位主要发生在柱中及柱两端;增加FRP层数,提高钢管屈服强度和混凝土强度均可提高柱的抗爆性能;建立的模型可以进一步推广到不同比例距离、不同截面形状的FRP钢管混凝土柱抗爆研究,同时为FRP钢管混凝土抗爆设计提供了一定依据。In order to investigate the blast resistance of concrete-filled steel tube(CFST)columns confined with fiber reinforced polymer(FRP),the numerical model of CFST columns confined with FRP under blast loading with a scaled distance of 0.28 m·kg^-1/3 was developed.The high-energy explosive material model and state equation in LS-DYNA non-linear finite element program were used to exert explosive load,and the multi-material fluid-solid coupling method was adopted in numerical simulation.The proposed model was verified by the available test data.The numerical results illustrated the displacement-time history of the column and the equivalent stress of steel tube,concrete and FRP,and the change law and distribution characteristics were analyzed.In addition,the effects of FRP layers,steel tube yield strength and concrete strength on CFST columns confined with FRP were studied by changing the corresponding parameters.The results show that FRP restraint can effectively improve the blast resistance of concrete filled steel tube,and its vulnerable parts mainly occur in the middle and both ends of the column.Increasing FRP layers,steel tube yield strength and concrete strength can improve the blast resistance of columns.The proposed finite element model can be extended to the blast research on CFST column confined with FRP with different scaled distances and section shapes.These results provide certain basis for blast resistance design of CFST columns confined with FRP.

关 键 词：FRP钢管混凝土 爆炸荷载 数值模拟 动力响应 

分 类 号：TU398[建筑科学—结构工程]