Abstract:In order to study anti-collapse performance of a RC frame with external pre-stressed tendons after failure of middle column, five 1/3 scale single-story two-span RC frames with external pre-stressed tendons were designed and fabricated.Tests for these RC frame’s mechanical performance, mechanism transformation, ultimate load-bearing capacity and catenary effect were conducted through changing boundary conditions and layout forms of external pre-stressed tendons after failure of middle column.Their loads, displacements, strains, and cracks’ initiation and expansion were measured.On the basis of test results, the finite element analysis model was established.The finite element computation results and test ones were compared.The results showed that external pre-stressed reinforcement can obviously improve anti-cracks performance of RC frames; on the premise of beam ends having reliable horizontal constraints, RC frames’ ultimate anti-collapse ability under frame beam mechanism can increase up to 70%, while their ultimate anti-collapse ability under catenary mechanism depends on yield strength and ultimate strength of external cable; compared with horizontal reinforcement form, fold line reinforcement one can provide larger vertical anti-collapse ability, and speed up mechanism transformation; increasing beam height and tensile stress value can improve the ultimate anti-collapse ability under frame beam mechanism; reasonable finite element model can be used to more accurately predict peak resistance under frame beam mechanism, and those under catenary mechanism and mechanism transformation node, respectively.
范云蕾,彭一帆,王杰. 中柱失效后体外预应力钢筋混凝土框架抗连续倒塌分析[J]. 振动与冲击, 2019, 38(23): 203-212.
FAN Yunlei,PENG Yifan,WANG Jie. Anti-collapse performance of RC frames with external pre-stressed tendons after failure of middle column. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(23): 203-212.
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