适用于型钢高强高性能混凝土柱的地震损伤模型
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摘要
为了较好地分析型钢高强高性能混凝土柱在地震荷载作用下的损伤破坏机理,通过对现有几种地震损伤模型的分析比较,并结合低周反复荷载作用下型钢高强高性能混凝土柱的滞回特性,建立以最大变形处卸载刚度的退化和累积的残余塑性变形为破坏参数的地震损伤模型,并结合已有的试验结果对损伤模型进行了非线性回归分析,确定模型中相关参数。同时分析剪跨比、混凝土强度、轴压比对型钢高强高性能混凝土柱损伤累积和发展的影响,结果表明,在加载后期,随着混凝土强度和轴压比的增加,型钢高强高性能混凝土柱的损伤发展加快;而随着剪跨比的增加,型钢高强高性能混凝土柱的延性提高,损伤进程相对平缓。
In order to preferably analyze damage mechanism of steel reinforced high strength and high performance concrete ( SRHSHPC) columns subjected to seismic load,by comparing and analyzing the current several seismic damage models and based on hysteretic characteristics of SRHSHPC columns under low cyclic loading,it is established a seismic damage model suitable for SRHSHPC columns,which takes unloading stiffness degradation corresponding to maximum deformation and accumulated residual plastic deformation as damage parameters.Furthermore,based on existing experimental results,nonlinear regression analysis to damage model is made to determine related parameters of the model.Meanwhile,the influence of shear-span ratio,concrete strength and axialcompression ratio on the damage accumulation and development of SRHSHPC columns are analyzed.The results show that the damage of SRHSHPC columns develops faster with increasing of concrete strength and axial compression ratio during late loading stage;however,the ductility of SRHSHPC columns becomes better and the damage process becomes more smoothly with increasing of shear span ratio.
In order to preferably analyze damage mechanism of steel reinforced high strength and high performance concrete ( SRHSHPC) columns subjected to seismic load,by comparing and analyzing the current several seismic damage models and based on hysteretic characteristics of SRHSHPC columns under low cyclic loading,it is established a seismic damage model suitable for SRHSHPC columns,which takes unloading stiffness degradation corresponding to maximum deformation and accumulated residual plastic deformation as damage parameters.Furthermore,based on existing experimental results,nonlinear regression analysis to damage model is made to determine related parameters of the model.Meanwhile,the influence of shear-span ratio,concrete strength and axialcompression ratio on the damage accumulation and development of SRHSHPC columns are analyzed.The results show that the damage of SRHSHPC columns develops faster with increasing of concrete strength and axial compression ratio during late loading stage;however,the ductility of SRHSHPC columns becomes better and the damage process becomes more smoothly with increasing of shear span ratio.
引文
[1]Park Y J,Ang A H-S.Mechanistic Seismic Damage Model for Reinforced Concrete[J].Journal of Structural Engineering,ASCE,1985,111(4):740-756.
[2]李翌新,赵世春.钢筋混凝土及劲性钢筋混凝土构件的累积损伤模型[J].西南交通大学学报,1994,4(8):412-417.
[3]白国良,赵鸿铁.反复加载时型钢钢筋混凝土框架柱的损伤过程[J].西安建筑科技大学学报,1998,3(9):213-216.
[4]牛荻涛,任利杰.改进的钢筋混凝土结构双参数地震破坏模型[J].地震工程与工程振动,1996,16(4):44-54.
[5]李军旗,赵世春.钢筋混凝土构件损伤模型[J].兰州铁道学院学报,2000,19(3):25-27.
[6]于海祥,吴建华,张国彬.一种新型的混凝土结构双参数地震损伤模型[J].重庆建筑大学学报,2004,26(5):43-48.
[7]李俊华,王新堂,薛建阳,等.低周反复荷载下型钢高强混凝土柱受力性能试验研究[J].土木工程学报,2007,40(7):11-18.
[8]彭春华.型钢高强高性能混凝土柱轴压比限值试验研究与理论分析[D].西安:西安建筑科技大学,2008.
[9]李斌,郝利维,薛刚,等.钢骨混凝土短柱累积损伤的研究[J].内蒙古科技大学学报,2005,24(1):9-11.
[2]李翌新,赵世春.钢筋混凝土及劲性钢筋混凝土构件的累积损伤模型[J].西南交通大学学报,1994,4(8):412-417.
[3]白国良,赵鸿铁.反复加载时型钢钢筋混凝土框架柱的损伤过程[J].西安建筑科技大学学报,1998,3(9):213-216.
[4]牛荻涛,任利杰.改进的钢筋混凝土结构双参数地震破坏模型[J].地震工程与工程振动,1996,16(4):44-54.
[5]李军旗,赵世春.钢筋混凝土构件损伤模型[J].兰州铁道学院学报,2000,19(3):25-27.
[6]于海祥,吴建华,张国彬.一种新型的混凝土结构双参数地震损伤模型[J].重庆建筑大学学报,2004,26(5):43-48.
[7]李俊华,王新堂,薛建阳,等.低周反复荷载下型钢高强混凝土柱受力性能试验研究[J].土木工程学报,2007,40(7):11-18.
[8]彭春华.型钢高强高性能混凝土柱轴压比限值试验研究与理论分析[D].西安:西安建筑科技大学,2008.
[9]李斌,郝利维,薛刚,等.钢骨混凝土短柱累积损伤的研究[J].内蒙古科技大学学报,2005,24(1):9-11.
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