基于塑性铰模型的三塔斜拉桥抗震能力时程分析
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摘要
采用非线性塑性铰考虑结构构件的混凝土开裂、钢筋屈服和材料滞回效应,利用APDL语言编制二分法程序使计算机进行自动计算和减少计算量,从而建立通过不断增大地震时程作用来计算斜拉桥结构抗震能力的方法,并以该方法分析研究了一座在建的三塔结合梁斜拉桥的抗震能力和地震反应特性。研究结果表明:在抗震能力状态,三塔斜拉桥中塔底内力响应要远大于边塔,但由地震引起的塔顶位移却相差很小,所以提高中塔抗震能力可以较快地提高整体结构的抗震能力;有塑性铰模型要比无塑性铰模型具有更高的计算抗震能力;采用二分法循环计算程序,不仅可以降低人工试算的烦琐程度而且能大幅减少循环计算次数,使大型结构的抗震能力分析较为简便。
Considering the effects of concrete crack,reinforcement yielding and hysteresis of structural components after adopting nonlinear plastic hinges,and using the language of APDL to write a bisection method program for automatic analysis and time reduction,a method of analyzing seismic resistance capacity of cable-stayed bridge was established,in which the seismic load is acted increasingly step by step.The seismic resistance capacity and responses of a composite girder cable-stayed bridge with three pylons under construction was investigated.The results show that the force responses at bottom of the middle pylon are much greater than at that of side pylons,but the deflection responses in the top of pylons caused by the seismic action are very close.So,increasing the capacity of the middle pylon to resist earthquake can improve the seismic resistance capacity of the whole bridge.The calculating seismic resistance capacity of the model with plastic hinges is higher than that with no plastic hinges.The bisection method program for loop calculation can reduce the trivial manual operation work and decrease the times of loop calculation.By using the method,it is convenient to analyze the seismic resistance capacity of large structures.
Considering the effects of concrete crack,reinforcement yielding and hysteresis of structural components after adopting nonlinear plastic hinges,and using the language of APDL to write a bisection method program for automatic analysis and time reduction,a method of analyzing seismic resistance capacity of cable-stayed bridge was established,in which the seismic load is acted increasingly step by step.The seismic resistance capacity and responses of a composite girder cable-stayed bridge with three pylons under construction was investigated.The results show that the force responses at bottom of the middle pylon are much greater than at that of side pylons,but the deflection responses in the top of pylons caused by the seismic action are very close.So,increasing the capacity of the middle pylon to resist earthquake can improve the seismic resistance capacity of the whole bridge.The calculating seismic resistance capacity of the model with plastic hinges is higher than that with no plastic hinges.The bisection method program for loop calculation can reduce the trivial manual operation work and decrease the times of loop calculation.By using the method,it is convenient to analyze the seismic resistance capacity of large structures.
引文
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[12]GB50010-200.混凝土结构设计规范[S].北京:中国建筑工业出版社,2002.
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[2]陈星烨,刘文浩,唐雪松.连续刚构桥的Pushover分析与应用[J].中南大学学报(自然科学版),2008,39(1):202-208.
[3]贾红梅,阎贵平.Pushover方法在双柱桥墩抗震性能评估上的应用[J].北京交通大学学报,2008,32(1):74-78.
[4]谭皓,刘钊.能力谱方法在桥梁抗震性能评估中的应用研究[J].世界地震工程,2009,25(4):174-180.
[5]王丽欣,杨钊,王海超,等.用新型箍筋(S-clip)的钢筋混凝土桥墩抗震性能试验研究[J].振动与冲击,2011,30(3):211-219.
[6]何晗欣,刘健新.能力谱方法在桥梁抗震性能评估中的适用性[J].长安大学学报,2009,29(4):48-52.
[7]徐秀丽,马静静,郎冬梅,等.高烈度地震区板式桥抗震性能研究[J].桥梁建设,2009(1):22-28.
[8]何钦象,田小红,宋丹.高墩大跨径连续刚构桥抗震性能评估[J].振动与冲击,2009,28(1):68-71.
[9]Palermo A,Pampanin S,Marriott D.Design,modeling,and experimental response of seismic resistant bridge piers with posttensioned dissipating connections[J].Journal of Structural Engineering,2007,133(11):1648-1661.
[10]Bryant G,Reginald D.Seismic performance assessment of simply supported and continuous multispan concrete girder highway bridges[J].Journal of Bridge Engineering,2007,12(5):611-620.
[11]Freire A,Negrao J,Lopes A.Geometrical nonlinearities on the static analysis of highly flexible steel cable-stayed bridges[J].Computers and Structures,2006,84:2128-2140.
[12]GB50010-200.混凝土结构设计规范[S].北京:中国建筑工业出版社,2002.
[13]JTG/T B02-01-2008.公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
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