EXPERIMENTAL RESEARCH ON COLLAPSE MECHANISM OF A RC FLAT PLATE
In collapse-resistant design of structures, it is important to understand the structural failuremechanism and alternative load paths under accidental load action. In this paper, an experimental study of an existing 4-story reinforced concrete frame model is reported. A quasi-static experimental method is proposed to simulate the sudden column loss in the flat plate frame structure. The weight of the upper structure was applied step by step to the plates center with a mechanical jack. With the increment of slabs center displacement, the radial cracks developed at the bottom surface. The load carrying capacity is enhanced around 40％ higher than the value Pyl calculated with the yield-line theory due to the compressive membrane action. And then an inverted conical damage region of around 3 times of the diameter of the circular load area appeared in the center of the flat plate when the displacement reaches to 1.81 times of the depth of flat plate section. The structure of the original load-transfer mechanism changed, and the remaining upper load was approximately 0.65 Pyl, which was taken by tension membrane. Based on the experimental results and phenomenon, the failure-mechanism of structure was analyzed, the collapse-resistant of flat plate was explored and discussed by compressive membrane and tension membrane action of flat plate.
progressive collapse collapse-resistant flat plate catenary action plastic line
Fan-Zhen Zhang Wei-Jian Yi
College of Civil Engineering, Hunan University, Changsha 410082, P.R. China
国际会议
广州
英文
417-423
2009-11-28（万方平台首次上网日期，不代表论文的发表时间）