反复荷载作用下矩形钢管混凝土树状节点的非线性分析
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摘要
本文在确定了往复应力作用下钢管混凝土的钢材和核心混凝土的应力-应变关系的基础上,利用纤维杆元模型,有限元模型对钢管混凝土Y形柱和十字形钢梁连接的节点的荷载-位移滞回关系曲线及其骨架曲线进行了计算,并与试验结果进行了比较。结果表明:由纤维杆元模型与试验所得的低周反复荷载作用下的骨架曲线极为相似,但在峰值荷载后差异较大;由纤维杆元模型和有限元所得的在低周反复荷载作用下滞回曲线也与在反复荷载作用下试验所得的结果相一致。纤维杆元模型能准确地预测节点的弹塑性行为和整体抗震性能,可用于节点滞回性能的非线性参数分析研究。在此基础上研究了方钢管混凝土柱的轴压比,宽厚比及核心混凝土强度对节点受力性能的影响。
In this paper,the load-displacement and skeleton curve of dendriform connections to the concrete filled square steel rectangular tubes under low-cycle reversed loading was calculated by fiber line element model,which is based on the relation of the stress-strain of steel and concrete and is compared with the FE and experiment.It is demonstrated that the monotonic load-displacement curves from the fiber line element models agree well with the framework curves of the cyclic behavior from the low-cycle reversed loading tests,but there is a great difference after the load-peak value.The monotonic load-displacement curves from the fiber line element models agree well with the framework curves of the cyclic behavior from FE models.The fiber line element models can accurately predict the overall seismic behavior and the inelastic performance,and can be used to conduct the nonlinear parameter analysis of the composite connections.Parametric analyses were conducted at the connections with exterior diaphragms to investigate the influences of compression ratio,width to thickness ratio and strength of the concrete in the square steel tube.
In this paper,the load-displacement and skeleton curve of dendriform connections to the concrete filled square steel rectangular tubes under low-cycle reversed loading was calculated by fiber line element model,which is based on the relation of the stress-strain of steel and concrete and is compared with the FE and experiment.It is demonstrated that the monotonic load-displacement curves from the fiber line element models agree well with the framework curves of the cyclic behavior from the low-cycle reversed loading tests,but there is a great difference after the load-peak value.The monotonic load-displacement curves from the fiber line element models agree well with the framework curves of the cyclic behavior from FE models.The fiber line element models can accurately predict the overall seismic behavior and the inelastic performance,and can be used to conduct the nonlinear parameter analysis of the composite connections.Parametric analyses were conducted at the connections with exterior diaphragms to investigate the influences of compression ratio,width to thickness ratio and strength of the concrete in the square steel tube.
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.
[2]Beutel J,Thambiratnam D,Perera N.Cyclic behaviour concrete filled steel tubular column to steel beam connection[J].Engineering Structures,2002,24:29-38.
[3]Ricles J M,Peng S W,Lu L W.Seismic behavior of compos concrete filled steel tube column-wide flange beam momeconnections[J].Journalof Structural Engineering,ASC2004,130(2):223-232.
[4]周天华.方钢管混凝土柱-钢梁框架节点抗震性能及承载力研究[D].西安:西安建筑科技大学,2004.
[5]林于东,林杰,宗周红.矩形钢管混凝土柱与钢梁栓焊接节点的滞回性能[J].地震工程与工程振动,2004,(4):62-69.
[6]宗周红,林于东,林杰.矩形钢管混凝土柱与钢梁半刚连接节点的抗震性能[J].建筑结构学报,2004,25(6)29-36.
[7]Alostag Y M,Schneider S P.Analytical behavior of connection to concrete-filled steel tubes[J].Journal of Constructional St Research,1996,40(2):95-127.
[8]Kang C H,Shin KJ,Oh Y S,et al.Hysteresis behave of CFTcolumn to H-beam connections with external T-stiffen and penetrated elements[J].Engineering Structures,2001.2:1194-1201.
[9]宗周红,林于东,陈惠文,等.方钢管混凝土柱与钢连接节点的拟静力试验研究[J].建筑结构学报,2005,26(1):77-84.
[10]陈惠发.土木工程材料的本构方程[M].余天庆,王勋文,刘再华译,刘西拉校.武汉:华中科技大学出版社,2001.
[11]Susantha K A S,Ge HB,Usami T.Uniaxial stress-strarelationship of concrete confined by various shaped steel tub[J].Engineering Struc-tures,2001,23:1331-1347.
[12]Ge HB,Susantha K A S,Satake Y,et al.Seismic demapredictions of concrete-filled steel box columns[J].Engineer Structures,2003,25:337-345.
[13]Varma A H,Riclesm J M,Richard S,et al.Seism behavior and modeling of high-strength composite concrete-fill steel tube(CFT)beam-col-umns[J].Journal of Construction Steel Research,2002,58:725-758.
[14]吕西林,卢文生.纤维杆元模型在框架结构非线性分析中的应用[J].力学季刊,2006,27(1):14-22.
[15]沈聚敏,王传志.钢筋混凝土有限元与板壳极限分析[M].北京:清华大学出版社,1993.
[2]Beutel J,Thambiratnam D,Perera N.Cyclic behaviour concrete filled steel tubular column to steel beam connection[J].Engineering Structures,2002,24:29-38.
[3]Ricles J M,Peng S W,Lu L W.Seismic behavior of compos concrete filled steel tube column-wide flange beam momeconnections[J].Journalof Structural Engineering,ASC2004,130(2):223-232.
[4]周天华.方钢管混凝土柱-钢梁框架节点抗震性能及承载力研究[D].西安:西安建筑科技大学,2004.
[5]林于东,林杰,宗周红.矩形钢管混凝土柱与钢梁栓焊接节点的滞回性能[J].地震工程与工程振动,2004,(4):62-69.
[6]宗周红,林于东,林杰.矩形钢管混凝土柱与钢梁半刚连接节点的抗震性能[J].建筑结构学报,2004,25(6)29-36.
[7]Alostag Y M,Schneider S P.Analytical behavior of connection to concrete-filled steel tubes[J].Journal of Constructional St Research,1996,40(2):95-127.
[8]Kang C H,Shin KJ,Oh Y S,et al.Hysteresis behave of CFTcolumn to H-beam connections with external T-stiffen and penetrated elements[J].Engineering Structures,2001.2:1194-1201.
[9]宗周红,林于东,陈惠文,等.方钢管混凝土柱与钢连接节点的拟静力试验研究[J].建筑结构学报,2005,26(1):77-84.
[10]陈惠发.土木工程材料的本构方程[M].余天庆,王勋文,刘再华译,刘西拉校.武汉:华中科技大学出版社,2001.
[11]Susantha K A S,Ge HB,Usami T.Uniaxial stress-strarelationship of concrete confined by various shaped steel tub[J].Engineering Struc-tures,2001,23:1331-1347.
[12]Ge HB,Susantha K A S,Satake Y,et al.Seismic demapredictions of concrete-filled steel box columns[J].Engineer Structures,2003,25:337-345.
[13]Varma A H,Riclesm J M,Richard S,et al.Seism behavior and modeling of high-strength composite concrete-fill steel tube(CFT)beam-col-umns[J].Journal of Construction Steel Research,2002,58:725-758.
[14]吕西林,卢文生.纤维杆元模型在框架结构非线性分析中的应用[J].力学季刊,2006,27(1):14-22.
[15]沈聚敏,王传志.钢筋混凝土有限元与板壳极限分析[M].北京:清华大学出版社,1993.
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