Q345钢轴心受力构件高温下设计参数与可靠度分析
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摘要
我国现行的钢结构设计规范中提出了各类钢材常温下设计指标,但尚未有高温下的设计指标。为了分析高温下钢材的设计指标,收集了152组Q345钢材高温材料性能数据,得到Q345钢材高温下材料性能不定性的统计参数;利用ABAQUS建立有限元模型,计算高温下Q345轴心受力构件承载力360组,从而获得Q345钢轴心受力构件高温下计算模式不定性的统计参数;基于统计结果采用一次二阶矩法,通过MATLAB编制程序提出了Q345钢轴心受力构件高温下抗力分项系数。对提出的系数进行可靠度校核分析,结果表明,满足建筑火灾下的可靠度要求,具有较好的可靠性。
In current Chinese code for design of steel structures,the design values of all kinds of steel at mbient temperature have been listed,but there is no design value for steel at high temperature.In order to analyze the design values of steel under high temperature,152 groups of mechanical properties of Q345 steel at high temperature were collected and the statistical parameters of material property uncertainties of Q345 steel under high temperature were obtained.The finite element model was established in the general finite element software ABAQUS to calculate the ultimate loading capacity of 360 groups of Q345 steel axial loading member under high temperature and the statistical parameters of model uncertainties of Q345 steel axial loading member under high temperature were generated.The partial factors for resistance of Q345 steel under high temperature were proposed by using the first-order second-moment reliability method which was programmed through Matlab and the reliability of the proposed resistance partial factors were checked.The result meets the reliability requirement of building in fire and have sufficient reliability.
In current Chinese code for design of steel structures,the design values of all kinds of steel at mbient temperature have been listed,but there is no design value for steel at high temperature.In order to analyze the design values of steel under high temperature,152 groups of mechanical properties of Q345 steel at high temperature were collected and the statistical parameters of material property uncertainties of Q345 steel under high temperature were obtained.The finite element model was established in the general finite element software ABAQUS to calculate the ultimate loading capacity of 360 groups of Q345 steel axial loading member under high temperature and the statistical parameters of model uncertainties of Q345 steel axial loading member under high temperature were generated.The partial factors for resistance of Q345 steel under high temperature were proposed by using the first-order second-moment reliability method which was programmed through Matlab and the reliability of the proposed resistance partial factors were checked.The result meets the reliability requirement of building in fire and have sufficient reliability.
引文
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[12]屈立军,李焕群,王跃琴,等.国产钢结构用Q345(16Mn)钢高温力学性能的恒温加载试验研究[J].土木工程学报,2008,41(7):33-40.QU Lijun,LI Huanqun,WANG Yueqin,et al.Material properties of Q345(16Mn)steel under loading and constant temperature[J].China Civil Engineering Journal,2008,41(7):33-40.(in Chinese)
[13]戴国欣,夏正中.建筑钢结构适用性分析[J].建筑结构学报,2000,21(3):36-40.DAI Guoxin,XIA Zhongzheng.Serviceability analysis of steel structural elements of buildings[J].Journal of Building Structures,2000,21(3):36-40.(in Chinese)
[14]王金平.我国典型既有建筑火灾荷载的标准值[C]//合肥:2013中国消防协会科学技术年会论文集,2013.WANG Jinping.Standard value of fire load in typical existing buildings in China[C]//Hefei:Proceedings of the 2013China Fire Society Science and Technology annual conference,2013.(in Chinese)
[15]中华人民共和国住房和城乡建设部.GB51249—2017.建筑钢结构防火技术规范[S].北京:中国计划出版社,2017.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.GB51249—2017.Technical code for fire safety of steel structure in buildings[S].Beijing:China Planning Press,2006.(in Chinese)
[2]Rackwitz R,Flessler B.Structural reliability under combined random load sequences[J].Computers&Structures,1978,9(5):489-494.
[3]中华人民共和国建设部.GB50068—2001建筑结构可靠度设计统一标准[M].北京:中国建筑工业出版社,2001.Ministry of Construction of the People’s Republic of China.GB 50068—2001 Unified standard for reliability design of building structures[M].Beijing:China Architecture&Building Press,2001.(in Chinese)
[4]蔡绍怀.钢筋混凝土结构安全度问题的探讨[J].土木工程学报,1962(2):33-40.CAI Shaohuai.Discussion on safety degree of reinforced concrete structure[J].China Civil Engineering Journal,1962(2):33-40.(in Chinese)
[5]中华人民共和国建设部.GBJ 17—1988钢结构设计规范[S].北京:中国建筑工业出版社,1989.Ministry of Construction of the People’s Republic of China.GBJ 17—1988Code for design of steel structures[S].Beijing:China Architecture&Building Press,1989.(in Chinese)
[6]施刚,朱希.国产高强度结构钢设计指标和可靠度分析[J].建筑结构学报,2016,37(11):144-159.SHI Gang,ZHU Xi.Design indexes and reliability analysis of domestic high-strength structural steels[J].Journal of Building Structures,2016,37(11):144-159.(in Chinese)
[7]朱希,施刚.国产高强结构钢材性参数的统计与分析[J].建筑结构,2015,45(21):9-15.ZHU Xi,SHI Gang.Statistics and analysis of material properties of domestic high-strength structural steels[J].Building Structure,2015,45(21):9-15.(in Chinese)
[8]施刚,朱希.高强钢压弯和受弯构件计算模式不定性研究[J].工业建筑,2016,46(7):32-40.SHI Gang,ZHU Xi.Research on resistance model uncertainty of high-strength steel members subjected to combined axial load and bending and flexural members[J].Industrial Construction,2016,46(7):32-40.(in Chinese)
[9]Meacham B J.Integrating human factors issues into engineered fire safety design[J].Fire&Materials,2015,23(6):273-279.
[10]施刚,朱希.高强钢轴心受压构件计算模式不定性研究[J].建筑结构,2014,44(16):36-40.SHI Gang,ZHU Xi.Research on resistance model uncertainty of high-strength steel axial compression members[J].Building Structure,2014,44(16):36-40.(in Chinese)
[11]陈国兴,李继华.钢构件材料强度及截面几何特性的统计参数[J].重庆建筑工程学院学报,1985(1):24-26.CHEN Guoxing,LI Jihua.Statistical parameters of material strength and geometric properties of shapes for steel members[J].Journal of Chongqing Institute of Architecture and Engineering,1985(1):24-26.(in Chinese)
[12]屈立军,李焕群,王跃琴,等.国产钢结构用Q345(16Mn)钢高温力学性能的恒温加载试验研究[J].土木工程学报,2008,41(7):33-40.QU Lijun,LI Huanqun,WANG Yueqin,et al.Material properties of Q345(16Mn)steel under loading and constant temperature[J].China Civil Engineering Journal,2008,41(7):33-40.(in Chinese)
[13]戴国欣,夏正中.建筑钢结构适用性分析[J].建筑结构学报,2000,21(3):36-40.DAI Guoxin,XIA Zhongzheng.Serviceability analysis of steel structural elements of buildings[J].Journal of Building Structures,2000,21(3):36-40.(in Chinese)
[14]王金平.我国典型既有建筑火灾荷载的标准值[C]//合肥:2013中国消防协会科学技术年会论文集,2013.WANG Jinping.Standard value of fire load in typical existing buildings in China[C]//Hefei:Proceedings of the 2013China Fire Society Science and Technology annual conference,2013.(in Chinese)
[15]中华人民共和国住房和城乡建设部.GB51249—2017.建筑钢结构防火技术规范[S].北京:中国计划出版社,2017.Ministry of Housing and Urban-Rural Development of the People’s Republic of China.GB51249—2017.Technical code for fire safety of steel structure in buildings[S].Beijing:China Planning Press,2006.(in Chinese)