爆炸作用时钢筋混凝土柱损伤因素分析

Analysis of explosion damage factors in reinforced concrete columns

为研究爆炸作用下钢筋混凝土柱的损伤破坏,通过有限元软件建立了钢筋混凝土柱数值计算模型,分析了5种损伤因素对柱损伤程度的影响。基于数值计算结果,以损伤指数为系统特征变量,以5种损伤因素为相关因素变量,进行了灰色关联分析。结果表明:提高箍筋配筋率和混凝土强度能够有效降低柱的损伤,纵筋配筋率对柱损伤影响相对较小;爆炸荷载下,各因素对钢筋混凝土柱损伤的影响程度从大到小依次为:炸药当量、箍筋配筋率、混凝土强度、爆源距离、纵筋配筋率。

In order to study the damage of reinforced concrete columns under the blast loading,a numerical calculation model of reinforced concrete columns is established by finite element software.The five factors in the column's damage are analyzed.Based on the numerical calculation results,the damage index is taken as the characteristic variable of system,and the five damaged factors are taken as the relevant factors,the grey relation analysis is performed.The results show that increasing the stirrup ratio and concrete strength can effectively reduce column damage,and the longitudinal reinforcement ratio has a relatively small effect on column damage.The results also indicate the influence degree of related factors on the damage of reinforced concrete columns,and the order from the largest to the smallest is:explosive equivalent,stirrup ratio,concrete strength,explosion source distance,to longitudinal reinforcement ratio.