经历弱震损伤的混凝土框架结构抗火性能试验研究
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摘要
设计了2榀配筋相同的足尺寸单层单跨混凝土框架KJ1、KJ2,对KJ1先进行模拟经历弱震损伤的低周反复荷载试验,接着进行了固定轴压比下的火灾反应试验,包括升温和降温过程;对KJ2直接进行固定轴压比下的火灾反应试验。研究了混凝土框架在火灾中的温度及变形反应,对KJ1、KJ2在试验后的表观现象、温度曲线、承载力变化等方面进行了对比分析,同时根据简化的温度场初步计算了框架柱的高温极限承载力。通过试验和理论分析比较表明,计算结果与最终试验现象从定性上分析是相符的。
Two monolayer concrete frames with the same reinforcement,KJ1 and KJ2,were designed.KJ1 was designed to simulate low cyclic reversed loading test under weak earthquake.Besides,the fire response test,including temperature rising and lowing,was made by fixing the axial compression ratio of the column.For KJ2,the fire response test at the fixed axial compression ratio was made.The deformation response of the concrete frames in fire was studied.Comparative analysis of the apparent phenomenon,temperature curves,bearing capacity change of the frames were made based on the test results of KJ1 and KJ2.According to the simplified temperature distribution,the ultimate bearing capacity of the column under the high temperature was preliminarily determined.It is illustrated that the calculation results and finally test phenomenon are consistent according to the simplified section.
Two monolayer concrete frames with the same reinforcement,KJ1 and KJ2,were designed.KJ1 was designed to simulate low cyclic reversed loading test under weak earthquake.Besides,the fire response test,including temperature rising and lowing,was made by fixing the axial compression ratio of the column.For KJ2,the fire response test at the fixed axial compression ratio was made.The deformation response of the concrete frames in fire was studied.Comparative analysis of the apparent phenomenon,temperature curves,bearing capacity change of the frames were made based on the test results of KJ1 and KJ2.According to the simplified temperature distribution,the ultimate bearing capacity of the column under the high temperature was preliminarily determined.It is illustrated that the calculation results and finally test phenomenon are consistent according to the simplified section.
引文
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[16]王振清,白丽丽,乔牧,等.四面受火后钢筋混凝土柱的可靠性分析[J].华中科技大学学报,2008,36(12):125-127.WANG ZHEN-QING,BAI LI-LI,QIAO MU,et al.Reliability of four-face fired reinforcement concrete columns[J].Journal of Huazhong University of Science and Technology,2008,36(12):125-127.
[2]韩新,沈祖炎,曾杰,等.建筑火灾危险性评估性能方法基本框架研究[J].自然灾害学报,2001,10(2):50-57.HAN XIN,SHEN ZU-YAN,ZENG JIE,et al.Study on a framework of performance-based method for hazard assessment of building fire[J].Journal of Natural Disasters,2001,10(2):50-57.
[3]余世舟,赵振东,钟江荣.基于GIS的地震次生灾害数值模拟[J].自然灾害学报,2003,12(4):100-105.YU SHI-ZHOU,ZHAO ZHEN-DONG,ZHONG JIANG-RONG.Numerical simulation of secondary disasters of earthquake based on GIS[J].Journal of Natural Disasters,2003,12(4):100-105.
[4]JGJ101—96建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.
[5]刘才玮.基于多遇地震损伤的混凝土框架结构抗火性能试验研究[D].青岛:青岛理工大学,2010.
[6]肖建庄,谢猛.高性能混凝土框架火灾后抗震性能试验研究[J].土木工程学报,2005,38(8):36-42.XIAO JIAN-ZHUANG,XIE MENG.An experimental study on the seismic behavior of HPC frames after fire[J].China Civil Engineering Journal,2005,38(8):36-42.
[7]李乌江.足尺寸轴压混凝土柱火灾行为试验分析研究[D].青岛:青岛理工大学,2009.
[8]K C H,THENIEL F S.Rostary.Strength of concrete subjected to high temperature and biaxial stress:experiments and modeling[J].Materials and Structures,1995,28:575-581.
[9]TAN K H,YUAN W F.Buckling of elastically restrained steel columns under longitudinal non-uniform temperature distribution[J].Journal of Constructional Steel Research,2008,64(1):51-61.
[10]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,2004,4(25):1-7.XIAO JIAN-ZHUANG,XIE MENG,PAN QI-JIAN.Experimental study on the fire response and fire resistance of high performance concrete frame[J].Journal of Building Structures,2004,4(25):1-7.
[11]DWAIKAT M B,KODUR V K R.A numerical approach for modeling the fire induced restraint effects in reinforced concrete beams[J].Fire Safety Journal,2007,43(4):291-307.
[12]谢猛.高性能混凝土框架抗火性能与火后抗震性能试验研究[D].上海:同济大学,2005.3.
[13]SEBASTJAN BRATINA,MIRAN SAJE,IGORPLANINC.The effects of different strain contributions on the response of RC beams in fire[J].Engineering Structures,2006,29(3):418-430.
[14]袁广林,张先扬,张玉明,等.四面受火钢筋混凝土柱正截面承载力的简化计算[J].四川建筑科学研究,2010,36(4):91-94.YUAN GUANG-LIN,ZHANG XIAN-YANG,ZHANG YU-MING,et al.Simplified calculation on bearing capacity of normal section for RC columns subjected to fire on four surfaces[J].Sichuan Building Science,2010,36(4):91-94.
[15]ZHAOHUI HUANG,IAN W BURGESS,ROGER J PLANK.Nonlinear analysis of reinforced concrete slabs subjected to fire[J].ACI Structural Journal,1999,96(1):127-131.
[16]王振清,白丽丽,乔牧,等.四面受火后钢筋混凝土柱的可靠性分析[J].华中科技大学学报,2008,36(12):125-127.WANG ZHEN-QING,BAI LI-LI,QIAO MU,et al.Reliability of four-face fired reinforcement concrete columns[J].Journal of Huazhong University of Science and Technology,2008,36(12):125-127.
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