近爆作用下钢筋混凝土柱的损伤机理研究  

Investigation on damage mechanism of RC column under close-in explosion

作　　者：龚顺风[1] 夏谦[1] 金伟良[1] 

机构地区：[1]浙江大学结构工程研究所,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2011年第8期1405-1410,共6页Journal of Zhejiang University：Engineering Science

基　　金：浙江大学国防预研基金资助项目;浙江省"钱江人才"计划资助项目(QJD0702006)

摘　　要：为了研究钢筋混凝土结构底层柱的抗爆性能,应用LS-DYNA软件对近爆作用下钢筋混凝土柱的损伤过程及破坏机理进行数值模拟分析,数值模型考虑应变率对钢筋和混凝土材料动力本构特性的影响以及炸药-空气-结构之间的流固耦合相互作用.结果表明,在爆炸冲击荷载作用下,钢筋混凝土柱表层混凝土首先开始剥落,受到约束的柱脚和柱顶混凝土发生冲剪破坏,在持续的横向变形作用下柱整体发生弯曲,产生一系列的横向裂缝;在等比例距离爆炸作用下,不同反射区的钢筋混凝土柱,受到的爆炸冲击荷载存在较大的差异,通常的比例定律不适用于近爆情形.In order to investigate the anti-explosion performance of reinforced concrete column in ground floor,numerical simulations were conducted for the analysis on the damage process and failure mechanism of RC column under close-in explosion using LS-DYNA software.The model involved the effects of strain rate on dynamic constitute characteristics of reinforcing bars and concrete material,as well as the coupled interactions of explosive-air-structure.The results show that the damages RC column under close-in blast loads may be characterized that the front surface layer concrete firstly starts spallation,then the constrained concrete at the bottom and top end of column takes place the punching-shear failure,after then the continuously transverse deformation induces the global bending of RC column,followed by distributed cracking perpendicular to longitudinal axis of the column;the blast loads acting on RC column located at different reflection zone with the same scaled distance display rather large differences,therefore,the traditional scaled law is no longer adapted to close-in explosion situation.

关 键 词：近爆 冲击波 钢筋混凝土 损伤 比例定律 

分 类 号：TU352[建筑科学—结构工程] O383[理学—流体力学]