Strengthening of Precast RC Frame to Mitigate Progressive Collapse by Externally Anchored Carbon Fiber Ropes

被引:6
作者
Pan, Jianwu [1 ]
Wang, Xian [1 ]
Dong, Hao [1 ]
机构
[1] Nanjing Univ Aeronaut & Astronaut, Dept Civil & Airport Engn, Nanjing 211106, Peoples R China
基金
国家重点研发计划;
关键词
progressive collapse; precast reinforced concrete frame structure; experiment; strengthening; carbon fiber rope; COLUMN CONNECTIONS; RESISTANCE; BOND;
D O I
10.3390/polym13081306
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The robustness of precast reinforced concrete (RC) frames is relatively poor, while the precast RC frames are strengthened to mitigate progressive collapse, avoiding "strong beams and weak columns" and the anchorage failure of strengthening materials under large deformation condition are the key problems. Aiming to discuss these problems, this paper carried out an experimental research of strengthening on three half-scale assembled monolithic frame subassemblages to mitigate progressive collapse. One specimen was strengthened by implanting carbon fiber rope (CFR) with polymer into concrete, one specimen was strengthened by binding CFR with special knot, and the last one was not strengthened. The failure mode, collapse failure mechanism and strengthening effect of subassemblages were discussed. Analytical models of load capacity increment contributed by CFR and construction suggestions of precast RC frame to mitigate progressive collapse were proposed. The results indicated that none of the strengthened specimens had anchorage failure. The two strengthening methods significantly increased the load capacity of the subassemblages in the catenary action (CA) stage with little effect on the flexural action (FA) stage and compressive arch action (CAA) stage.
引用
收藏
页数:16
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