火灾后钢筋混凝土柱的剩余承载力研究
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摘要
对ISO834标准火灾作用后钢筋混凝土柱的剩余承载性能及方形柱剩余承载力的实用计算方法进行了研究。结合高温后混凝土和钢筋的本构模型及虚梁法,建立了火灾作用后钢筋混凝土柱剩余承载力的数值分析模型,并编制了相应的程序CAFIRE,程序考虑了轴力的二阶效应。利用程序分析了相关参数对标准火灾作用后钢筋混凝土方形柱剩余承载力的影响规律。针对不同受火时间、计算长度、截面尺寸、荷载偏心率、配筋率和荷载角等情况,共进行了2700种工况下钢筋混凝土方形柱剩余承载力分析。在计算结果的基础上,定量给出了标准火灾作用后钢筋混凝土方形柱剩余承载力的实用计算方法。最后利用程序比较了不同受火时间后相同横截面面积、相同配筋率、不同截面形状混凝土柱的剩余承载力。
The residual bearing mechanism of reinforced concrete (RC) columns and the practical calculation method for the residual strength of square columns after exposure to ISO834 standard fire are investigated. Combining the constitutive model of concrete and its reinforcements after exposure to fire and the conjugate method, the numerical model for the calculation of residual strength of RC columns after exposure to fire is proposed and the corresponding program CAFIRE is developed. The second-order effect of the axial force is considered in the study. Using the numerical program CAFIRE, the influence of several correlative parameters on the residual strength of RC columns with square cross section after exposure to ISO834 standard fire is analyzed. 2700 RC columns with square cross section are selected for residual strength analyses. Different fire exposure times, effective lengths, sectional dimensions, load eccentricity ratios, reinforcement ratios and load angles are considered in the analyses. Based on the simulation results, a practical calculation method is proposed for the residual strength of RC square columns. Moreover, the residual strength of RC columns with the same sectional area and reinforcement ratio but with different shape of cross section is compared using the program.
The residual bearing mechanism of reinforced concrete (RC) columns and the practical calculation method for the residual strength of square columns after exposure to ISO834 standard fire are investigated. Combining the constitutive model of concrete and its reinforcements after exposure to fire and the conjugate method, the numerical model for the calculation of residual strength of RC columns after exposure to fire is proposed and the corresponding program CAFIRE is developed. The second-order effect of the axial force is considered in the study. Using the numerical program CAFIRE, the influence of several correlative parameters on the residual strength of RC columns with square cross section after exposure to ISO834 standard fire is analyzed. 2700 RC columns with square cross section are selected for residual strength analyses. Different fire exposure times, effective lengths, sectional dimensions, load eccentricity ratios, reinforcement ratios and load angles are considered in the analyses. Based on the simulation results, a practical calculation method is proposed for the residual strength of RC square columns. Moreover, the residual strength of RC columns with the same sectional area and reinforcement ratio but with different shape of cross section is compared using the program.
引文
[1]刘利先,时旭东,过镇海.增大截面法加固高温损伤混凝土柱的试验研究[J].工程力学,2003,20(5):18―23.Liu Lixian,Shi Xudong,Guo Zhenhai.Experimental investigation of strengthened reinforced concrete columns after exposure to high temperature[J].Engineering Mechanics,2003,20(5):18―23.(in Chinese)
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[6]马忠诚,吴波,欧进萍.四面受火后钢筋砼柱抗震性能研究[J].计算力学学报,1997,14(4):443―453.Ma Zhongcheng,Wu Bo,Ou Jinping.Seismic characteristics of RC columns after fire in all sides[J].Chinese Journal of Computational Mechanics,1997,14(4):443―453.(in Chinese)
[7]韩林海,杨华,霍静思,杨有福.标准火灾作用后矩形钢管混凝土柱剩余承载力的研究[J].工程力学,2002,19(5):78―86.Han Linhai,Yang Hua,Huo Jingsi,Yang Youfu.Residual strength of concrete filled steel tubular columns with rectangular sections after exposure to standard fire[J].Engineering Mechanics,2002,19(5):78―86.(in Chinese)
[8]韩林海,杨有福,霍静思.钢管混凝土柱火灾后剩余承载力的试验研究[J].工程力学,2001,18(6):100―109.Han Linhai,Yang Youfu,Huo Jingsi.Tests on the residual strength of concrete filled tubular columns after exposure to fire[J].Engineering Mechanics,2001,18(6):100―109.(in Chinese)
[9]徐玉野.钢筋混凝土异形柱的抗火性能研究[D].广州:华南理工大学,2006.Xu Yuye.Fire resistance of reinforced concrete columns with special-shaped cross section[D].Guangzhou:South China University of Technology,2006.(in Chinese)
[10]过镇海,时旭东.钢筋混凝土的高温性能及其计算[M].北京:清华大学出版社,2003.Guo Zhenhai,Shi Xudong,Behaviour of reinforced concrete at elevated temperature and its calculation[M].Beijing:Tsinghua University Press,2003.(in Chinese)
[11]Kim J K,Lee S S.The behavior of reinforced concrete columns subjected to axial force and biaxial bending[J].Engineering Structures,2000,22(11):1518―1528.
[2]陆洲导,朱伯龙,熊海贝.钢筋砼框架火灾作用后加固修复研究[J].四川建筑科学研究,1995,21(3):7―12.Lu Zhoudao,Zhu Bolong,Xiong Haibei.Research on the strengthening and repairing of reinforced concrete structures after fire[J].Building Science Research of Sichuan,1995,21(3):7―12.(in Chinese)
[3]吴波,马忠诚,欧进萍.高温后钢筋混凝土柱抗震性能的试验研究[J].土木工程学报,1999,32(2):53―58.Wu Bo,Ma Zhongcheng,Ou Jinping.Experimental study on seismic properties of R.C.columns after high temperature[J].China Civil Engineering Journal,1999,32(2):53―58.(in Chinese)
[4]吴波,马忠诚,欧进萍.火灾后钢筋混凝土结构的抗震性能研究[J].哈尔滨建筑大学学报,1996,29(1):9―16.Wu Bo,Ma Zhongcheng,Ou Jinping.Study on the aseismic characteristics of R.C.structures after fire[J].Journal of Harbin University of Architecture and Engineering,1996,29(1):9―16.(in Chinese)
[5]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].地震工程与工程振动,1994,14(4):24―34.Wu Bo,Ma Zhongcheng,Ou Jinping.Study on the aseismic characteristics of R.C.compression-flexure members after fire[J].Earthquake Engineering and Engineering Vibration,1994,14(4):24―34.(in Chinese)
[6]马忠诚,吴波,欧进萍.四面受火后钢筋砼柱抗震性能研究[J].计算力学学报,1997,14(4):443―453.Ma Zhongcheng,Wu Bo,Ou Jinping.Seismic characteristics of RC columns after fire in all sides[J].Chinese Journal of Computational Mechanics,1997,14(4):443―453.(in Chinese)
[7]韩林海,杨华,霍静思,杨有福.标准火灾作用后矩形钢管混凝土柱剩余承载力的研究[J].工程力学,2002,19(5):78―86.Han Linhai,Yang Hua,Huo Jingsi,Yang Youfu.Residual strength of concrete filled steel tubular columns with rectangular sections after exposure to standard fire[J].Engineering Mechanics,2002,19(5):78―86.(in Chinese)
[8]韩林海,杨有福,霍静思.钢管混凝土柱火灾后剩余承载力的试验研究[J].工程力学,2001,18(6):100―109.Han Linhai,Yang Youfu,Huo Jingsi.Tests on the residual strength of concrete filled tubular columns after exposure to fire[J].Engineering Mechanics,2001,18(6):100―109.(in Chinese)
[9]徐玉野.钢筋混凝土异形柱的抗火性能研究[D].广州:华南理工大学,2006.Xu Yuye.Fire resistance of reinforced concrete columns with special-shaped cross section[D].Guangzhou:South China University of Technology,2006.(in Chinese)
[10]过镇海,时旭东.钢筋混凝土的高温性能及其计算[M].北京:清华大学出版社,2003.Guo Zhenhai,Shi Xudong,Behaviour of reinforced concrete at elevated temperature and its calculation[M].Beijing:Tsinghua University Press,2003.(in Chinese)
[11]Kim J K,Lee S S.The behavior of reinforced concrete columns subjected to axial force and biaxial bending[J].Engineering Structures,2000,22(11):1518―1528.
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