高性能混凝土框架火灾后抗震性能试验研究
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摘要
对3榀火灾后和1榀未受火的高性能混凝土单层单跨框架进行了低周反复加载下的抗震性能试验研究,分析了高温火灾、混凝土强度等级对高性能混凝土框架结构破坏机制、承载力、滞回特性、延性、刚度以及耗能的影响规律,建立了相应的恢复力模型,并探讨了聚丙烯纤维(PPF)对这些性能的影响。研究表明,火灾后高性能混凝土框架结构易出现“强梁弱柱”,承载力、刚度及耗能均明显下降,仅延性有所提高,总体上抗震性能下降。混凝土强度等级低者火灾后框架结构抗震性能更低,而聚丙烯纤维对火灾后高性能混凝土框架结构抗震性能的影响需结合多种有利因素和不利因素综合考虑。
Based on an experimental study on the seismic behavior of three single-span and single-storey HPC frames after fire and one such frame at ambient temperature,the effects of fire and HPC strength grade on the failure mechanism,bearing capacity,hysteresis property,ductililty,stiffness and energy dissipation of HPC frames are discussed,the recovery-force models are established,and the effects of the polypropylene fiber (PPF)on these characteristics are also investigated.The results show that a HPC frame structure after fire is easily changed into a strong-beam and weak-column structure,and the bearing capacity,stiffness and energy dissipation decrease greatly except for ductility.The seismic behavior of frame made of HPC with lower strength is even worse.The addition of polypropylene fiber brings both virtues and weaknesses to the seismic behavior of HPC frames after fire.
Based on an experimental study on the seismic behavior of three single-span and single-storey HPC frames after fire and one such frame at ambient temperature,the effects of fire and HPC strength grade on the failure mechanism,bearing capacity,hysteresis property,ductililty,stiffness and energy dissipation of HPC frames are discussed,the recovery-force models are established,and the effects of the polypropylene fiber (PPF)on these characteristics are also investigated.The results show that a HPC frame structure after fire is easily changed into a strong-beam and weak-column structure,and the bearing capacity,stiffness and energy dissipation decrease greatly except for ductility.The seismic behavior of frame made of HPC with lower strength is even worse.The addition of polypropylene fiber brings both virtues and weaknesses to the seismic behavior of HPC frames after fire.
引文
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[2]吴波,马忠诚,欧进萍.火灾后钢筋混凝土压弯构件的抗震性能研究[J].地震工程与工程震动,1994,14(4):24-34
[3]马忠诚,吴波,欧进萍.四面受火后钢筋混凝土柱抗震性能研究[J].计算力学学报,1997,14(4):443-453
[4]肖建庄,王平,朱伯龙.我国钢筋混凝土材料抗火性能研究回顾与分析[J].建筑材料学报,2003,6(2):182-189
[5]肖建庄,李杰,姜峰.矿渣高性能混凝土剪力墙高温后抗震性能试验研究[J].建筑结构学报,2003,24(4):35-40
[6]肖建庄,谢猛,潘其健.高性能混凝土框架火灾反应与抗火性能研究[J].建筑结构学报,2004,25(4):1-7
[7]周志祥.高等钢筋混凝土结构[M].北京:人民交通出版社,2002
[8]建筑抗震试验方法规程(JG J 101-96)[S].北京:中国建筑工业出版社,1997
[9]李杰,李国强.地震工程学导论[M].北京:地震出版社,1992
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