基于OpenSees的钢筋混凝土桥墩抗震性能分析
|
摘要
将弹塑性纤维模型引入基于柔度法的非线性梁柱单元,通过有限元分析软件OpenSees对钢筋混凝土桥墩在低周反复荷载作用下的受力性能进行了模拟.对墩底截面内力、变形和钢筋受拉应变进行了参数分析.结果表明:墩底截面内力和刚度随轴压比和配筋率的增大而增大,截面变形和钢筋受拉应变随轴压比和配筋率的增大而减小,随着延性比的增加,轴压比较大的试件的截面曲率和受拉钢筋应变的增长程度更加显著,钢筋硬化参数对于分析结果有较大影响.
Hysteretic performance of RC(reinforced concrete) bridge piers under low cycle reversed loads was analyzed by OpenSees software,after the fiber model was introduced into force based nonlinear beam column element.The parameters,such the section internal forces,deformation and tensile reinforcement strain of piers′ bottom,were analyzed.The following results are shown that: with the increase of axial compression ratio and reinforcement rate,the section internal force and stiffness of piers′ bottom increase;the section deformation and tensile reinforcement strain of piers′ bottom decrease;with the increase of ductility ratio,the growth degree of section curvature and tensile reinforcement strain of specimens with larger axial compression ratio is more obvious.The reinforced hardening parameter influences the analysis results markedly.
Hysteretic performance of RC(reinforced concrete) bridge piers under low cycle reversed loads was analyzed by OpenSees software,after the fiber model was introduced into force based nonlinear beam column element.The parameters,such the section internal forces,deformation and tensile reinforcement strain of piers′ bottom,were analyzed.The following results are shown that: with the increase of axial compression ratio and reinforcement rate,the section internal force and stiffness of piers′ bottom increase;the section deformation and tensile reinforcement strain of piers′ bottom decrease;with the increase of ductility ratio,the growth degree of section curvature and tensile reinforcement strain of specimens with larger axial compression ratio is more obvious.The reinforced hardening parameter influences the analysis results markedly.
引文
[1]潘志宏,李爱群.基于纤维模型的外粘型钢加固混凝土柱静力弹塑性分析[J].东南大学学报:自然科学版,2009,39(3):552-556.
[2]韩小雷,陈学伟.足尺钢框架振动台试验及动力弹塑性数值模拟[J].地震工程与工程振动,2008,28(6):134-141.
[3]杨红.双向地震作用对框架柱端弯矩增大系数的影响分析[J].土木工程学报,2008,41(9):40-47.
[4]罗云标,吴刚,吴智深,等.钢-连续纤维复合筋(SFCB)增强混凝土柱抗震性能初探[J].工程抗震与加固改造,2009,31(1):14-20.
[5]Zhu Z,Ahmad I,Mirmiran A.Fiber element model-ing for seismic performance of bridge columns madeof concrete-filled FRP tubes[J].Engineering Struc-tures,2006,28:2023-2035.
[6]Berry M P,Eberhard M O.Performance modelingstrategies for modern reinforced concrete bridge col-umns[R].Berkeley:Department of Civil Engineer-ing,University of California,2008.
[7]Scott B D,Park R,Priestley M J N.Stress-strain be-havior of concrete confined by overlapping hoops atlow and high strain rates[J].ACI Journal,1982,79(1):13-27.
[8]Blakely R W G,Park R.Prestressed concrete sec-tions with cyclic flexure[J].Journal of the StructuralDivision,1973,99(8):1717-1742.
[9]Filippou F C.A fiber beam-column element for seis-mic response analysis of RC structures[R].Berkeley:Department of Civil Engineering,University of Cali-fornia,1991.
[10]钟铭.钢筋混凝土桥墩低周疲劳损伤后性能试验及理论研究[D].北京:北京交通大学土木建筑工程学院,2010.
[2]韩小雷,陈学伟.足尺钢框架振动台试验及动力弹塑性数值模拟[J].地震工程与工程振动,2008,28(6):134-141.
[3]杨红.双向地震作用对框架柱端弯矩增大系数的影响分析[J].土木工程学报,2008,41(9):40-47.
[4]罗云标,吴刚,吴智深,等.钢-连续纤维复合筋(SFCB)增强混凝土柱抗震性能初探[J].工程抗震与加固改造,2009,31(1):14-20.
[5]Zhu Z,Ahmad I,Mirmiran A.Fiber element model-ing for seismic performance of bridge columns madeof concrete-filled FRP tubes[J].Engineering Struc-tures,2006,28:2023-2035.
[6]Berry M P,Eberhard M O.Performance modelingstrategies for modern reinforced concrete bridge col-umns[R].Berkeley:Department of Civil Engineer-ing,University of California,2008.
[7]Scott B D,Park R,Priestley M J N.Stress-strain be-havior of concrete confined by overlapping hoops atlow and high strain rates[J].ACI Journal,1982,79(1):13-27.
[8]Blakely R W G,Park R.Prestressed concrete sec-tions with cyclic flexure[J].Journal of the StructuralDivision,1973,99(8):1717-1742.
[9]Filippou F C.A fiber beam-column element for seis-mic response analysis of RC structures[R].Berkeley:Department of Civil Engineering,University of Cali-fornia,1991.
[10]钟铭.钢筋混凝土桥墩低周疲劳损伤后性能试验及理论研究[D].北京:北京交通大学土木建筑工程学院,2010.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心