接触爆炸荷载作用下大跨度钢筋混凝土井字梁框架倒塌与柱底防护  

Collapse of Long-span Reinforced Concrete Well-shaped Beam Frame and Protection of Column Bottom Under Contact Explosion

作　　者：周清 齐麟[2] ZHOU Qing;QI Lin(Binzhou City Planning and Design Institute,Binzhou 256600,Shandong,China;Airport College,Civil Aviation University of China,Tianjin 300300,China)

机构地区：[1]滨州市规划设计研究院,山东滨州256600 [2]中国民航大学机场学院,天津300300

出　　处：《济南大学学报（自然科学版）》2020年第6期533-542,共10页Journal of University of Jinan(Science and Technology)

基　　金：国家自然科学基金项目(51508557);山东省住房和城乡建设厅综合科技示范项目(2019-K14-001);山东省住房城乡建设科技计划项目(2017-K4-007,2018-K5-001)。

摘　　要：为了研究接触爆炸荷载作用下大跨度钢筋混凝土井字梁框架的倒塌破坏过程,提出合理的柱底防护措施;在已有相关文献的基础上,验证数值分析方法的正确性,并选择合理的钢筋与混凝土材料模型,采用数值分析方法,借助LS-DYNA软件,研究不同药量接触爆炸荷载作用下钢筋混凝土大跨度井字梁框架的破坏过程,对提出的2种柱底防护方案进行比较,并对产生不同防护效果的原因进行分析。结果表明:在用药质量为2 kg的接触爆炸荷载作用下,框架发生类似在自重下的弹性振动,框架仍可正常工作;在用药质量为10 kg的接触爆炸荷载作用下,框架发生严重的倒塌破坏;通过与未采取防护措施的框架相比,采用防护方案1的框架各参考点的位移明显减小,框架只发生轻微破坏,采用防护方案2的框架则产生了更严重的破坏。To study the collapse process of long-span reinforced concrete well-shaped beam frame under explosive load,reasonable protection measures for column bottom were put forward.Based on the existing literature,correctness of the numerical analysis method was verified and reasonable material models of steel bar and concrete were selected.By means of numerical analysis and LS-DYNA software,the failure process of reinforced concrete long-span well-beam frame subjected to contact explosion with different charge was studied.Two protection schemes for column bottom were compared and reasons for different protection effects were analyzed.The results show that the elastic vibration of the frame under charge 2 kg contact explosion is similar to that under dead weight,and it can still work normally.The frame collapses seriously under charge 10 kg contact explosion.Compared with the frame without protective measures,the displacement of each reference point of the frame with protective scheme 1 is significantly reduced,and only slight damage occurs to the frame.The frame with protective scheme 2 suffers more serious damage than that without protective measures.

关 键 词：建筑结构抗爆 柱底防护措施 数值分析 大跨度井字梁框架 倒塌过程 接触爆炸 

分 类 号：TU352[建筑科学—结构工程]