Experiment on anti-progressive collapse performance of RC space frame considering the effect of cast-in-place slabs(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2017年06期
- Page:
- 54-62
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Experiment on anti-progressive collapse performance of RC space frame considering the effect of cast-in-place slabs
- Author(s):
- GAO Jia-ming; LIU Bo-quan; HUANG Hua; ZHOU Chang-quan; PAN Liang; FAN Zi-xuan
- School of Civil Engineering, Chang’an University, Xi’an 710061, Shaanxi, China
- Keywords:
- structural engineering; RC frame structure with slab; progressive collapse; quasi-static test; catenary; tension membrane; cast-in-place slab
- PACS:
- TU375.4
- DOI:
- -
- Abstract:
- In order to study the anti-vertical progressive collapse performance of reinforced concrete frame with slab, a quasi-static vertical progressive collapse test was carried out on a 1/3 scale of two-storey by two-bay reinforced concrete frame structure. The concentrated load was applied in the top of the column. The side column was removed by controlling displacement. The vertical structure collapse process was simulated until structural collapse destroyed. The deformation and strain slab steel structure and vertical resistance were observed and analyzed. The results show that the progressive collapse resistance of reinforced concrete with slab is provided by the beam arch-plate pressure film mechanism, the beam arch-plate compressive membrane mechanism, the beam catenary-plate tension membrane mechanism, and the plate tension membrane mechanism. The structural ultimate resistance occurs in the structure of extrapolated-admittance shift. Due to the strengthening effect of cast-in-place slabs on the upper part of beam, before the crushing of concrete in the compression area of the upper part of beam, the vertical reinforcement of the tensioned area of the lower part of beam has been greatly damaged. At this time, the vertical resistance of the structure appears to decrease significantly. The macroscopic deformation of the structure undergoes the horizontal extrapolation stage, the horizontal adduction stage and the collapse stage. The maximum lateral displacement of the structure does not exceed the lateral limit of the frame column in the specification of “code for seismic design of buildings” (GB 50011—2010), which indicates that the failure of single side column does not cause the continuous destruction of the adjacent column. The final structure collapse is controlled by the pull-off and the anchor of steel bars in the cast-in-place slabs. The unfavorable load is mainly redistributed through the beam connected with the failure column and the cast-in-place slabs. The beam without the association of the failure column appears significant tensional damage, which indicates that the plate tension membrane effect allows more components to be effectively involved in the destruction process of the structure collapse. After the failure of the frame beam, the cast-in-place slabs can provide 84.9% resistance of the ultimate load, which reflects the improvement of cast-in-place slabs on the mechanical performance and deformation capacity of the overall structure.
Last Update: 2017-12-18