火灾后SRC柱-RC梁框架结构反复加载试验
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宁波大学 土木与环境工程学院

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Cyclic loading test for SRC column-RC beam frame after exposure to fire
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College of Civil and Environment Engineering ,Ningbo University

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    摘要:

    对一个SRC柱-RC梁框架在火灾后和另一个比较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-△效应进行了分析。试验结果表明,与未暴露火灾的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-△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0.04rad,可以满足我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 the other comparative frame at ambient temperature to investigate the post-fire performance of such frame.Load bearing capacity, stiffness degeneration, ductility, energy dissipation were evaluated, and accumulative damage as well as P-? effect were analyzed. Test results showed that SRC column-RC beam frame after exposure to fire have lower bearing capacity, smaller stiffness, lower ductility, increased accumulative damage and more obvious P-? effect compared with its unexposed counterpart. Owing to the existence of core steel in the section of frame columns, the hysteresis loops of SRC column-RC beam frame after exposure to fire still kept plump, and the load bearing capacity could maintain a relatively high level before destruction. Moreover, SRC column-RC beam frame after exposure to fire exhibited good energy consumption ability. The plastic limit rotation of it exceeded 0.04rad, which could well meet the requirement of China seismic design code.

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历史
  • 收稿日期:2020-05-07
  • 最后修改日期:2020-09-09
  • 录用日期:2020-09-25
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