建筑结构学报2024，Vol.45Issue(1)：1-11,11.DOI:10.14006/j.jzjgxb.2023.0313
爆炸荷载作用下钢筋混凝土双跨梁子结构连续倒塌机制试验研究
Experimental study on progressive collapse mechanism of reinforced concrete sub-assemblage with two-span beams under blast loading
摘要
Abstract
To investigate the progressive collapse mechanism of reinforced concrete(RC)sub-structure with double-span beams under blast loading,three vertical impact tests on middle-joint of the RC substructures with double-span beams are carried out,which is aimed to consider the axial tension effect on the remaining sub-structure from the bearing column in failed process under blast loading.The results showed that,at the moment of loading,an obvious reverse arch action appeared in beam due to inertial effect,compressive arch action appeared with decrease of inertial effect and increase of middle joint displacement.Under the impact condition in test,no fracture occurred in the longitudinal bars.The damage mode of beam exhibited a flexural damage at the beam ends.Continuous longitudinal bars at the top of the beam can mitigate the crack development in beam span,and reduce the peak displacement of middle joint in dynamic response of substructure.关键词
双跨梁子结构/钢筋混凝土/爆炸荷载/抗倒塌机制/反拱机制/压拱机制Key words
sub-assemblage with two-span beams/reinforced concrete/blast loading/progressive collapse resistant mechanism/reverse arch mechanism/compressive arch mechanism分类
建筑与水利引用本文复制引用
李忠献,刘昊琨,师燕超,丁阳..爆炸荷载作用下钢筋混凝土双跨梁子结构连续倒塌机制试验研究[J].建筑结构学报,2024,45(1):1-11,11.基金项目
国家自然科学基金项目(51938011,52178498). （51938011,52178498）
