火灾后型钢混凝土异形柱正截面承载力非线性分析
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摘要
为了研究火灾后型钢混凝土异形柱的正截面承载力,在9根十字形、8根T形、9根等肢L形(简称DL形)和9根不等肢L形(简称BL形)型钢混凝土柱试验研究的基础上,编制了MATLAB非线性程序,通过对比表明运算结果与试验结果基本吻合。利用程序分析了弯矩作用方向角、含钢率、混凝土强度等级和偏心距对火灾后型钢混凝土异形柱正截面承载力的影响。试验结果表明:火灾后型钢混凝土异形柱破坏形式分为受拉破坏、受压破坏、轴心受压破坏和界限破坏;截面应变分布也基本符合平截面假定;在偏心距一定的情况下,0°加载角的承载力高于45°加载角的承载力。在其它因素一定的条件下,构件的极限承载力随含钢率的增大而增大,与混凝土强度等级呈正比,随偏心距的增大而减小。
Thirty five specimens are designed for static loading to research the section bearing capacity,including nine cruciformshaped,eight T-shaped,nine L-shaped with equal legs(DL-shaped)and nine L-shaped with unequal legs(BL-shaped)steel reinforced concrete special-shaped columns.A set of MATLAB nonlinear programs are compiled.Overall,the calculation results are consistent with experimental results.And the influences of loading-angle,sectional steel ratio,concrete strength grade and eccentricity are analyzed.Test results show that the failure modes of steel reinforced concrete special-shaped columns are tension failure mode,compression failure mode,balanced failure mode and axial compression failure mode.The sectional strain basically fits the plane-section assumption.When the columns are loaded with same eccentricity,the specimens with 45°are more damaged than those with 0°.The increase in the sectional steel ratio and concrete strength grade can improve the normal section bearing capacity effectively.With the increase of eccentricity,the flexural capacity decreases.
Thirty five specimens are designed for static loading to research the section bearing capacity,including nine cruciformshaped,eight T-shaped,nine L-shaped with equal legs(DL-shaped)and nine L-shaped with unequal legs(BL-shaped)steel reinforced concrete special-shaped columns.A set of MATLAB nonlinear programs are compiled.Overall,the calculation results are consistent with experimental results.And the influences of loading-angle,sectional steel ratio,concrete strength grade and eccentricity are analyzed.Test results show that the failure modes of steel reinforced concrete special-shaped columns are tension failure mode,compression failure mode,balanced failure mode and axial compression failure mode.The sectional strain basically fits the plane-section assumption.When the columns are loaded with same eccentricity,the specimens with 45°are more damaged than those with 0°.The increase in the sectional steel ratio and concrete strength grade can improve the normal section bearing capacity effectively.With the increase of eccentricity,the flexural capacity decreases.
引文
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[20]YEN J Y R.Quasi-Newton method for reinforced-concrete column analysis and design[J].Journal of Structural Engineering,1991,117(3):657-666.DOI:10.1061/(ASCE)0733-9445(1991)117:3(657).
[2]单齐云,高立堂.火灾下型钢混凝土异形柱温度场分析[J].防灾减灾工程学报,2012,32(增刊):99-102.DOI:10.13409/j.cnki.jdpme.2012.s1.019.SHAN Qiyun,GAO Litang.Temperature field analysis of steel reinforced concrete special-shaped columns[J].Journal of Disaster Prevention and Mitigation Engineering,2012,32(Suppl.):99-102.DOI:10.13409/j.cnki.jdpme.2012.s1.019.(in Chinese)
[3]吴波,火灾后钢筋混凝土结构的力学性能[M].北京:科学出版社,2003.WU Bo.The mechanical properties of reinforced concrete structures after fire[M].Beijing:Science Press,2003.(in Chinese)
[4]LIE T T,CELIKKOL B.Method to calculate the fire resistance of circular reinforced concrete columns[J].ACI Materials Journal,1991,88(1):682-683.
[5]LIE T T,IRWIN R J.Method to calculate the fire resistance of reinforced concrete columns with rectangular cross section[J].ACI Structural Journal,1993,90(1):52-60.
[6]陆洲导,余江滔,徐朝晖.钢骨混凝土抗火性能非线性分析[J].同济大学学报(自然科学版),2006,34(11):1445-1450.LU Zhoudao,YU Jiangtao,XU Zhaohui.Nonlinear analysis of steel reinforced concrete columns under fire[J].Journal of Tongji University(Natural Science),2006,34(11):1445-1450.(in Chinese)
[7]吴波,徐玉野.高温下钢筋混凝土异形柱的试验研究[J].建筑结构学报,2007,28(5):24-31.DOI:10.14006/j.jzjgxb.2007.05.003.WU Bo,XU Yuye.Experimental study on reinforced concrete columns with special shaped cross section subjected to high temperature[J].Journal of Building Structures,2007,28(5):24-31.DOI:10.14006/j.jzjgxb.2007.05.003.(in Chinese)
[8]徐玉野,吴波.高温下钢筋混凝土异形柱的截面特性[J].华南理工大学学报(自然科学版),2007,35(11):14-21.XU Yuye,WU Bo.Sectional properties of reinforced concrete columns with special-shaped cross section at elevated temperature[J].Journal of South China University of Technology(Natural Science Edition),2007,35(11):14-21.(in Chinese)
[9]吴波,徐玉野.钢筋砼十字形柱的耐火极限研究[J].工程力学,2008,25(3):167-173.WU Bo,XU Yuye.Fire resistance of reinforced concrete columns with+-shaped cross section[J].Engineering Mechanics,2008,25(3):167-173.(in Chinese)
[10]吴波,徐玉野.钢筋混凝土异形柱高温下力学性能的数值模拟[J].土木工程学报,2006,39(12):48-53,59.DOI:10.15951/j.tmgcxb.2006.12.008.WU Bo,XU Yuye.Numerical simulation of the mechanical behaviors of RC columns of specially-shaped cross section subjected to high temperature[J].China Civil Engineering Journal,2006,39(12):48-53,59.DOI:10.15951/j.tmgcxb.2006.12.008.(in Chinese)
[11]TAN K H,YAO Y.Fire resistance of reinforced concrete columns subjected to 1-,2-,and 3-face heating[J].Journal of Structural Engineering,2004,130(11):1820-1828.DOI:10.1061/(ASCE)0733-9445(2004)130:11(1820).
[12]郑永乾,韩林海.钢骨混凝土柱的耐火性能和抗火设计方法(I)[J].建筑钢结构进展,2006,8(2):22-29.ZHENG Yongqian,HAN Linhai.Fire performance and design method of steel reinforced concrete(SRC)columns(I)[J].Progress in Steel Building Structures,2006,8(2):22-29.(in Chinese)
[13]郑永乾,韩林海.钢骨混凝土柱的耐火性能和抗火设计方法(II)[J].建筑钢结构进展,2006,8(3):24-33.ZHENG Yongqian,HAN Linhai.Fire performance and design method of steel reinforced concrete(SRC)columns(II)[J].Progress in Steel Building Structures,2006,8(3):24-33.(in Chinese)
[14]陈宗平,王妮,钟铭,等.型钢混凝土异形柱正截面承载力试验及有限元分析[J].建筑结构学报,2013,34(10):108-119.DOI:10.14006/j.jzjgxb.2013.10.013.CHEN Zongping,WANG Ni,ZHONG Ming,et al.Experimental study and finite element analysis on normal section bearing capacity of steel reinforced concrete specialshaped columns[J].Journal of Building Structures,2013,34(10):108-119.DOI:10.14006/j.jzjgxb.2013.10.013.(in Chinese)
[15]李少泉,沙镇平.钢骨混凝土梁正截面承载力计算的叠加方法[J].土木工程学报,2004,37(7):1-5,58.DOI:10.15951/j.tmgcxb.2004.07.001.LI Shaoquan,SHA Zhenping.Superposition for calculating bearing capacity on normal section of beam with steel skeleton and bars reinforced concrete[J].China Civil Engineering Journal,2004,37(7):1-5,58.DOI:10.15951/j.tmgcxb.2004.07.001.(in Chinese)
[16]史春辉.型钢混凝土异形柱抗火性能研究及简化计算公式[D].青岛:青岛理工大学,2013.SHI Chunhui.Experimental study on fire resistance of steel reinforced concrete special-shaped columns and simplified calculation formula[D].Qingdao:Qingdao University of Technology,2013.(in Chinese)
[17]李卫,过镇海.高温下砼的强度和变形性能试验研究[J].建筑结构学报,1993,14(1):8-16.DOI:10.14006/j.jzjgxb.1993.01.002.LI Wei,GUO Zhenhai.Experimental investigation of strength and deformation of concrete at elevated temperature[J].Journal of Building Structures,1993,14(1):8-16.DOI:10.14006/j.jzjgxb.1993.01.002.(in Chinese)
[18]时旭东.高温下钢筋混凝土杆系结构试验研究和非线性有限元分析[D].北京:清华大学,1992.SHI Xudong.Test research and nonlinear finite element analysis on reinforced concrete truss structure under high temperature[D].Beijing:Tsinghua University,1992.(in Chinese)
[19]过镇海.钢筋混凝土原理[M].北京:清华大学出版社,1999.GUO Zhenhai.Principles of reinforced concrete[M].Beijing:Tsinghua University Press,1999.(in Chinese)
[20]YEN J Y R.Quasi-Newton method for reinforced-concrete column analysis and design[J].Journal of Structural Engineering,1991,117(3):657-666.DOI:10.1061/(ASCE)0733-9445(1991)117:3(657).