钢管自应力混凝土抗弯性能研究
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摘要
对15根钢管自应力混凝土构件的抗弯性能进行了试验测试,在此基础上,利用混凝土的边界面模型和钢材的弹塑性模型,建立了自应力钢管混凝土抗弯构件的三维有限元模型并编制计算程序对其力学性能进行了分析,试验结果和计算结果基本吻合.研究结果表明,由于自应力的影响,自应力钢管混凝土抗弯承载力要高于普通钢管混凝土,并且承载力随着自应力的增加而增加;通过计算分析,提出了计算自应力钢管混凝土构件抗弯承载力的经验公式;并推荐采用AIJ的计算方法计算该结构的抗弯刚度.
Flexure tests on 12 self-stressing concrete filled steel tube(SSCFST) specimens and 3 conventional concrete filled steel tube(CFST) specimens were done.The results indicate that the flexural capacity of CFST specimen is lower than that of SSCFST specimen when 28-day cube strength of concrete core,yield strength and geometrical dimension of the steel tube are kept same.Based on a bounding surface model of the concrete and elastic-plasticity constitutive relations of steel,the finite element model of the self-stressing concrete filled steel tube is established,and the analysis on the mechanical performance is done.The calculated results indicate that the SSCFST specimen has higher carrying capacity than CFST specimen duo to self-stress.Finally,an empirical equation for predicting the shear capacity of SSCFST short beam is proposed.
Flexure tests on 12 self-stressing concrete filled steel tube(SSCFST) specimens and 3 conventional concrete filled steel tube(CFST) specimens were done.The results indicate that the flexural capacity of CFST specimen is lower than that of SSCFST specimen when 28-day cube strength of concrete core,yield strength and geometrical dimension of the steel tube are kept same.Based on a bounding surface model of the concrete and elastic-plasticity constitutive relations of steel,the finite element model of the self-stressing concrete filled steel tube is established,and the analysis on the mechanical performance is done.The calculated results indicate that the SSCFST specimen has higher carrying capacity than CFST specimen duo to self-stress.Finally,an empirical equation for predicting the shear capacity of SSCFST short beam is proposed.
引文
[1]韩林海.钢管混凝土结构-理论与实践[M].北京:科学出版社,2004.
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[3]王庆利,董志峰,高建志.圆截面钢管混凝土受弯构件试验研究[J].四川建筑科学研究,2007,33(3):9-12.
[4]姚民乐,徐东方,高金良.矩形钢管混凝土受弯构件承载力的研究[J].浙江建筑,2006,23(4):18-20.
[5]郭兰慧,张素梅,王玉银.方形、矩形钢管高强混凝土受弯构件的理论分析与试验研究[J].钢结构,2002(6):29-33.
[6]赵宏勋,郭红飞.钢管混凝土抗弯承载力简化算法[J].湘潭师范学院学报,2006,28(2):93-95.
[7]孙俊,柴迎春.钢管混凝土受弯构件极限承载力计算方法探讨[J].四川建筑,2006,26(1):96-98.
[8]常旭.钢管自应力混凝土结构研究[D].大连:大连理工大学,2008.
[9]蔡绍怀.现代钢管混凝土结构(修订版)[M].北京:人民交通出版社,2007.
[10]屠永清.混凝土本构关系的边界面模型的讨论[J].哈尔滨建筑工程学院学报,1994,27(4)41-48.
[11]CHEN E S,BUYUKOZTURK O.Constitutive Model for Concrete in Cylic Compression[J].Journal of EngineeringMechanics,ASCE,1985,111(6):797-813.
[12]PAGONNI T,SLATER J,AMEUR MOUSSA R,et al.A Nonlinear Three-Dimensional Analysis of Reiforced Con-crete Based on a Bounding Surface Model[J].Computer and Structure,1992,43(1):1-12.
[2]杨有福,韩林海.矩形钢管混凝土构件抗弯力学性能的试验研究[J].地震工程与工程震动,2001,21(3):41-48.
[3]王庆利,董志峰,高建志.圆截面钢管混凝土受弯构件试验研究[J].四川建筑科学研究,2007,33(3):9-12.
[4]姚民乐,徐东方,高金良.矩形钢管混凝土受弯构件承载力的研究[J].浙江建筑,2006,23(4):18-20.
[5]郭兰慧,张素梅,王玉银.方形、矩形钢管高强混凝土受弯构件的理论分析与试验研究[J].钢结构,2002(6):29-33.
[6]赵宏勋,郭红飞.钢管混凝土抗弯承载力简化算法[J].湘潭师范学院学报,2006,28(2):93-95.
[7]孙俊,柴迎春.钢管混凝土受弯构件极限承载力计算方法探讨[J].四川建筑,2006,26(1):96-98.
[8]常旭.钢管自应力混凝土结构研究[D].大连:大连理工大学,2008.
[9]蔡绍怀.现代钢管混凝土结构(修订版)[M].北京:人民交通出版社,2007.
[10]屠永清.混凝土本构关系的边界面模型的讨论[J].哈尔滨建筑工程学院学报,1994,27(4)41-48.
[11]CHEN E S,BUYUKOZTURK O.Constitutive Model for Concrete in Cylic Compression[J].Journal of EngineeringMechanics,ASCE,1985,111(6):797-813.
[12]PAGONNI T,SLATER J,AMEUR MOUSSA R,et al.A Nonlinear Three-Dimensional Analysis of Reiforced Con-crete Based on a Bounding Surface Model[J].Computer and Structure,1992,43(1):1-12.
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