近场爆炸荷载作用下装配式钢筋混凝土叠合梁动力响应数值分析  

Numerical analysis of dynamic response of fabricated reinforced concrete superimposed beam under close-in range explosion

作　　者：段文峰[1] 陈国庆 刘文渊 DUAN Wen-feng;CHEN Guo-qing;LIU Wen-yuan(School of civil engineering,Jilin Jianzhu university,Changchun 130118,China;School of civil engineering,Suzhou university of science and technology,Suzhou 225300,Jiangsu province,China)

机构地区：[1]吉林建筑大学土木工程学院,长春130118 [2]苏州科技大学土木工程学院,江苏苏州225300

出　　处：《吉林建筑大学学报》2024年第1期9-16,共8页Journal of Jilin Jianzhu University

基　　金：国家自然科学基金项目(51978166).

摘　　要：为研究装配式钢筋混凝土叠合梁的抗爆性能,采用显式动力有限元软件LS-DYNA建立了相应的数值模型,通过已有的钢筋混凝土现浇梁爆炸试验研究对数值模型进行了验证。采用验证了的数值模型对爆炸荷载作用下的叠合梁和现浇梁进行动力响应分析,考虑比例距离、炸药量、浇筑方式等参数变化对装配式钢筋混凝土叠合梁动力响应及抗爆性能的影响。结果表明:随比例距离减小或炸药量增大,梁破坏形态由弯曲破坏向弯剪破坏转变,梁位移响应加剧;叠合梁抗爆性能略低于现浇梁,但尚能满足规范要求。The blast performance of fabricated reinforced concrete superimposed beams subjected to close-in range explosion are investigated,a numerical model is developed by the explicit nonlinear dynamic analysis program LS-DYNA,and verified by the experimental results of the reinforced concrete cast-in-place beam.After that,the numerical models are used to further investigate the dynamic response of the fabricated superimposed beam and cast-in-place beam under close-in range explosion.The influence parameters,such as scaled distance,charge weight,pouring method,are considered to investigate the dynamic response and blast resistance of the fabricated reinforced concrete superimposed beam.The results indicate that the failure mode of the beam was changed from flexural failure to flexural-shear failure,and the displacement response of the beam was intensified,with the decrease of the scaled distance,or the charge weight;The blast resistance of the fabricated beam was slightly lower than that of cast-in-place beam,but it can be also satisfied the requirements of the design code.

关 键 词：数值分析 抗爆性能 预制钢筋混凝土叠合梁 近场爆炸 破坏模式 

分 类 号：TU312.3[建筑科学—结构工程]