火灾后SRC柱-RC梁框架结构性能反复加载试验研究
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TU391;TU398

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National Natural Science Foundation of China (No.51178226); Basic Public Welfare Research Project of Zhejiang Province (No. LGF18E080008)


Cyclic loading test on the performance of SRC column-RC beam frame after exposure to fire
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    摘要:

    对一个SRC柱-RC梁框架在火灾后与另一个对照框架在常温下进行了低周反复加载试验,研究了该框架的火灾后性能,评价了框架的承载力、刚度退化、延性、耗能能力、累积损伤,同时对P-Δ效应进行了分析。试验结果表明,与未暴露在火灾的SRC柱-RC梁框架相比,火灾后SRC柱-RC梁框架的承载力降低、刚度减小、延性系数下降、累积损伤增大,且P-Δ效应更为明显。由于框架柱截面中有核心钢的存在,SRC柱-RC梁框架在火灾后的滞回曲线仍保持饱满,破坏前的承载力可以保持在较高的水平,依然表现出良好的耗能能力。其塑性极限转动超过0.04 rad,可以满足中国抗震设计规范的要求。

    Abstract:

    Quasi-static cyclic tests were performed on one SRC column-RC beam frame after exposure to fire and an identical frame at ambient temperature to investigate the post-fire performance of the frame.The load bearing capacity, stiffness degeneration, ductility, and energy dissipation were evaluated, and the cumulative damage and the P-Δ effect were analyzed. Test results showed that after exposure to fire the SRC column-RC beam frame had a lower bearing capacity, less stiffness, lower ductility, increased cumulative damage and a more obvious P-Δ effect compared with its unexposed counterpart. Owing to the existence of core steel in the section of the frame column, after exposure to fire, the hysteresis loops of the SRC column-RC beam frame remained plump, and the load bearing capacity remained relatively high before destruction. Moreover, after exposure to fire, the SRC column-RC beam frame exhibited good energy consumption ability. The plastic limit rotation exceeded 0.04 rad, which could well meet the requirement of China's seismic design code.

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李俊华,李权平,张磊,黄梦迪.火灾后SRC柱-RC梁框架结构性能反复加载试验研究[J].土木与环境工程学报(中英文),2021,43(1):107-119. LI Junhua, LI Quanping, ZHANG Lei, HUANG Mengdi. Cyclic loading test on the performance of SRC column-RC beam frame after exposure to fire[J]. JOURNAL OF CIVIL AND ENVIRONMENTAL ENGINEERING,2021,43(1):107-119.10.11835/j. issn.2096-6717.2020.143

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  • 收稿日期:2020-05-07
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  • 在线发布日期: 2021-02-02
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