钢筋混凝土连续梁抗连续倒塌压拱机制的数值分析  

Numerical Analysis of Compressive Arch Action of Reinforced Concrete Continuous Beams Against Progressive Collapse

作　　者：李易[1] 刘永超 程小卫[1] 孙海林 LI Yi;LIU Yongchao;CHENG Xiaowei;SUN Hailin(Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China;China Architecture Design&Research Group,Beijing 100044,China)

机构地区：[1]北京工业大学工程抗震与结构诊治北京市重点实验室,北京100124 [2]中国建筑设计研究院有限公司,北京100044

出　　处：《北京工业大学学报》2024年第11期1350-1358,共9页Journal of Beijing University of Technology

基　　金：国家自然科学基金资助项目(52178094)。

摘　　要：为了验证既有结构抗连续倒塌压拱(compressive arch action,CAA)机制理论在工程尺度中的适用性问题,基于有限元分析软件LS-DYNA建立了钢筋混凝土连续梁的全精细数值模型,并通过已有实验验证了该模型的可靠性。基于该模型建立9个足尺结构的数值模型,考虑了工程常用的截面高度、跨度和配筋率。基于数值模拟的结果,分析了上述结构参数对CAA机制发展的影响。结果表明:随着配筋率的增大,CAA机制对结构抗连续倒塌的增强作用逐渐降低;在9~12的跨高比范围内,CAA机制对结构抗连续倒塌的增强作用提升,而在12~15的跨高比范围内,增强作用降低。To verify the applicability of the existing methods of compressive arch action(CAA)against progressive collapse in engineering scale,a fully detailed numerical model of a reinforced concrete continuous beam using the finite element software LS-DYNA was established.The reliability of this model was verified through existing experiments.Nine full-scale structural models were then numerically modeled based on this validated model,taking into account commonly used section heights,spans,and steel ratios in engineering practice.Research findings indicate that as the steel ratio increases,the enhancing effect of CAA on structural resistance to progressive collapse gradually diminishes.Furthermore,within a span-to-height ratio range of 9-12,there is an increase in enhancement provided by CAA for resisting progressive collapse;however,within a span-to-height ratio range of 12-15,the enhancing effect diminishes.

关 键 词：钢筋混凝土 连续梁 连续倒塌 压拱(compressive arch action CAA)机制 倒塌抗力 倒塌变形 

分 类 号：TU375.1[建筑科学—结构工程]