爆炸荷载作用下钢筋混凝土构件缩尺效应的数值模拟研究  

Numerical Study on the Scaling Effect of Reinforced Concrete Members under Blast Load

作　　者：刘子超 吴俊[1] 喻君 冯晓伟[3] LIU Zichao;WU Jun;YU Jun;FENG Xiaowei(School of Urban Railway Transportation,Shanghai University of Engincering Science,Shanghai 201620,China;School of Civil Engineering,Southeast University,Nanjing 210008,China;Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,China)

机构地区：[1]上海工程技术大学城市轨道交通学院,上海201620 [2]东南大学土木工程学院,南京210008 [3]中国工程物理研究院总体工程研究所,绵阳621999

出　　处：《结构工程师》2022年第4期16-28,共13页Structural Engineers

基　　金：国家自然科学基金(51978246,52078288)。

摘　　要：基于一组用于爆炸荷载下钢筋混凝土构件动力响应的无量纲相似准则,结合已有钢筋混凝土板缩尺抗爆试验数据,采用显式动力有限元软件LS-DYNA及弹塑性混凝土损伤本构模型,建立爆炸荷载作用下原型和缩尺钢筋混凝土板有限元模型,研究缩尺效应中缩尺系数、材料断裂能和材料应变率对钢筋混凝土板动力响应相似性的影响。结果表明:(1)采用弹塑性损伤本构模型能有效反映钢筋混凝土构件动力响应的缩尺效应,且缩尺模型的破坏形式及位移满足相似率;(2)当缩尺系数为0.2时,缩尺数值模型无法有效表征原型构件的损伤分布及位移响应,使其不满足钢筋混凝土板动力响应的相似率;(3)混凝土材料断裂能对构件动力响应的相似率影响不大,而混凝土应变率对缩尺模型的动力响应具有较大影响。研究结果可为钢筋混凝土构件抗爆试验中缩尺系数和模型材料选择、有限元模型中相关材料断裂能和应变率选取提供有效建议。Based on a set of dimensionless terms and the existing test data of the reinforcement concrete slab under blast load,the LS-DYNA and the damaged elastic-plastic concrete constitutive model were adopted to establish the finite element model of prototype and scaled reinforced concrete slabs under blast load.The influence of scale effects on the blast resistance of reinforced concrete slabs and its corresponding was studied.The factor of scale factor,material fracture energy and material strain rate in the numerical model on the similarity of damage pattern and damage parameters of prototype and scaled reinforcement concrete slabs were discussed.The results show that:(1)The numerical model could effectively reflect the scale strengthening effect of reinforced concrete components,and the similarity of damage pattern and damage parameters of prototype and scaled reinforced concrete slabs can be achieved;(2)When the scale factor was less than 0.2,the scaled numerical model cannot effectively characterize the damaged situation and displacement response of the prototype component;(3)The scale of the fracture energy of concrete materials had little effect on the dynamic response of the prototype member,whereas the concrete strain rate had a greater influence on the results of the scaled model.The research results can provide effective suggestions for determining scale factor of the reinforced concrete components in field blast test,and the relevant parameters of fracture energy and strain rate in the finite element model.

关 键 词：爆炸 缩尺效应 钢筋混凝土板 混凝土损伤模型 

分 类 号：TU375[建筑科学—结构工程]