钢管混凝土轴压构件耗能计算及单位体积耗能公式建立
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摘要
提出了计算钢管混凝土轴压构件材料阻尼的新方法,根据Lazan材料阻尼与应力关系的理论研究,计算弹性阶段钢管混凝土构件在轴向重复荷载下的滞回曲线包围面积,得到钢管混凝土材料单位体积损耗能量。结果表明,单位体积损耗能量随最大应力幅值的提高而增大,且随混凝土强度和截面含钢率增大而减小。通过SPSS统计分析软件回归建立了钢管混凝土构件在轴向重复荷载下材料单位体积耗能与最大应力幅值、混凝土强度和截面含钢率的关系式。为进一步准确分析钢管混凝土结构动力性能及进行钢管混凝土结构的抗震分析打下了基础。
A new method to compute material damping of a concrete-filled steel tube(CFST)was presented.Based on the relation between material damping and stress amplitude by Lazan,the area of hysteresis loop of a CFST under axial cyclic load was calculated with a bilinear steel constitutive model,a confined concrete constitutive model and the loading-unloading law for a OpenSEES system,the energy dissipation per unit volume of the CFST was obtained.The results indicated that the energy dissipation per unit volume of the CFST increases with increase in maximum stress amplitude and decreases with increase in the concrete strength and the ratio of steel area to the total area of the cross section.The computation formula for the energy dissipation per unit volume of the CFST was established by using nonlinear regression with SPSS software and it would be helpful in material behavior study on CFST and dynamic response computation of CFST structures.
A new method to compute material damping of a concrete-filled steel tube(CFST)was presented.Based on the relation between material damping and stress amplitude by Lazan,the area of hysteresis loop of a CFST under axial cyclic load was calculated with a bilinear steel constitutive model,a confined concrete constitutive model and the loading-unloading law for a OpenSEES system,the energy dissipation per unit volume of the CFST was obtained.The results indicated that the energy dissipation per unit volume of the CFST increases with increase in maximum stress amplitude and decreases with increase in the concrete strength and the ratio of steel area to the total area of the cross section.The computation formula for the energy dissipation per unit volume of the CFST was established by using nonlinear regression with SPSS software and it would be helpful in material behavior study on CFST and dynamic response computation of CFST structures.
引文
[1]钟善桐.钢管混凝土结构[M].北京:清华大学出版社,2003.
[2]Ahid D,Nashif,et al.Vibration Damping[M].New York:John Wiley&Sons,1985.
[3]刘钊,吴京,吕志涛.钢管混凝土塔柱斜拉桥的动力特性和地震响应[J].桥梁建设,2001(5):10-13.
[4]刘传文,徐升桥.丫髻沙大桥主桥的地震反应[J].铁道标准设计,2000,20(12):8-11.
[5]郑史雄,周述华.大跨度钢管混凝土拱桥的地震反应性能[J].西南交通大学学报,1999,34(3):320-324.
[6]郑家树,金邦元.大跨度杆管混凝土拱桥空间地震反应分析[J].西南交通大学学报,2003,38(1):53-56.
[7]欧享德,韦明吉.柳州文惠钢管混凝土中承式拱桥[A].中国公路学会桥梁和结构工程学会1996年桥梁学术讨论会论文集1[C].北京:人民交通出版社,1996.
[8]Newmark N M,Hall W J.Seismic design criteria for nuclear reactor facilities[A].Proceedings of Fourth World Conference on Earthquake Engineering[C].Santiago,Chile,1969.
[9]张相庭.结构阻尼耗能假设及在振动计算中的应用[J].振动与冲击,1982,1(2):12-22.
[10]Lazan B J.Damping of Material and Members in Structural Mechanics[M].London:Pergamon Press,1968.
[11]陶忠.方钢管混凝土构件力学性能若干关键问题的研究[M].哈尔滨:哈尔滨工业大学出版社,2001.
[12]韩林海.钢管混凝土结构——理论与实践[M].北京:科学出版社,2004.
[13]滕智明,邹离湘.反复荷载下钢筋混凝土构件非线性有限元分析[J].土木工程学报,1996,29(2):19-27.
[2]Ahid D,Nashif,et al.Vibration Damping[M].New York:John Wiley&Sons,1985.
[3]刘钊,吴京,吕志涛.钢管混凝土塔柱斜拉桥的动力特性和地震响应[J].桥梁建设,2001(5):10-13.
[4]刘传文,徐升桥.丫髻沙大桥主桥的地震反应[J].铁道标准设计,2000,20(12):8-11.
[5]郑史雄,周述华.大跨度钢管混凝土拱桥的地震反应性能[J].西南交通大学学报,1999,34(3):320-324.
[6]郑家树,金邦元.大跨度杆管混凝土拱桥空间地震反应分析[J].西南交通大学学报,2003,38(1):53-56.
[7]欧享德,韦明吉.柳州文惠钢管混凝土中承式拱桥[A].中国公路学会桥梁和结构工程学会1996年桥梁学术讨论会论文集1[C].北京:人民交通出版社,1996.
[8]Newmark N M,Hall W J.Seismic design criteria for nuclear reactor facilities[A].Proceedings of Fourth World Conference on Earthquake Engineering[C].Santiago,Chile,1969.
[9]张相庭.结构阻尼耗能假设及在振动计算中的应用[J].振动与冲击,1982,1(2):12-22.
[10]Lazan B J.Damping of Material and Members in Structural Mechanics[M].London:Pergamon Press,1968.
[11]陶忠.方钢管混凝土构件力学性能若干关键问题的研究[M].哈尔滨:哈尔滨工业大学出版社,2001.
[12]韩林海.钢管混凝土结构——理论与实践[M].北京:科学出版社,2004.
[13]滕智明,邹离湘.反复荷载下钢筋混凝土构件非线性有限元分析[J].土木工程学报,1996,29(2):19-27.
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