铁路连续梁桥横向减隔震支座参数研究
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摘要
以某3跨铁路连续梁桥为例,运用有限元分析程序SAP2000,建立采用E型钢阻尼支座减隔震的全桥计算分析模型,进行3条人工地震波激励下的时程响应分析。将E型钢阻尼支座屈服力和屈服位移作为控制参数,在硬化比不变的情况下研究中墩和边墩的支座屈服力比和屈服位移对全桥横向减隔震效果的影响规律。分析结果表明:中墩和边墩E型钢阻尼支座的屈服力比对横向减隔震效果有较大的影响,屈服力比的取值与各桥墩支座反力接近时,各墩可得到比较接近的横向隔震率;支座的屈服位移对支座的剪切变形量有较大影响,可以在满足隔震率要求的前提下,通过控制支座的屈服位移控制梁体的横向位移。
Using the finite element analysis program SAP2000,the whole bridge analysis model of a three-span continuous railway beam bridge isolated with E-shaped steel damping bearings was established and the seismic response analyses under three artificial earthquake excitations were carried out by time-history method.Considering the yield force and yield displacement of E-shaped steel damping bearings to be the control parameters,with a constant harden ratio,the influence laws of the yield force ratio and the yield displacements of the bearings on the transverse seismic isolation effect of the whole bridge were studied.The analysis results indicate that the yield force ratio between the E-shaped steel damping bearings on the middle piers and those on the side piers has greater influence on the transverse seismic isolation effect.When the value of the yield force ratio approaches to the reaction ratio of each pier bearing,the transverse seismic isolation ratios of all piers are similar.The yield displacements of the bearings have greater impact on the shearing deformations of the bearings.On the premise of meeting the requirements for seismic isolation ratio,the transverse displacement of the beam can be controlled by controlling the yield displacements of the bearings.
Using the finite element analysis program SAP2000,the whole bridge analysis model of a three-span continuous railway beam bridge isolated with E-shaped steel damping bearings was established and the seismic response analyses under three artificial earthquake excitations were carried out by time-history method.Considering the yield force and yield displacement of E-shaped steel damping bearings to be the control parameters,with a constant harden ratio,the influence laws of the yield force ratio and the yield displacements of the bearings on the transverse seismic isolation effect of the whole bridge were studied.The analysis results indicate that the yield force ratio between the E-shaped steel damping bearings on the middle piers and those on the side piers has greater influence on the transverse seismic isolation effect.When the value of the yield force ratio approaches to the reaction ratio of each pier bearing,the transverse seismic isolation ratios of all piers are similar.The yield displacements of the bearings have greater impact on the shearing deformations of the bearings.On the premise of meeting the requirements for seismic isolation ratio,the transverse displacement of the beam can be controlled by controlling the yield displacements of the bearings.
引文
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[7]潘晋,吴成亮,仝强,等.E型钢阻尼器数值仿真及试验研究[J].振动与冲击,2009,28(7):192-195.(PAN Jin,WU Chengliang,TONG Qiang,et al.Numerical Simulation and Experimental Study on E-Shape SteelDamper[J].Journal of Vibration and Shock,2009,28(7):192-195.in Chinese)
[2]吴彬,庄军生.铅芯橡胶支座力学性能及其在桥梁工程中减、隔震应用研究[J].中国铁道科学,2004,25(4):138-140.(WU Bin,ZHUANG Junsheng.Study on Mechanical Characteristics of Lead-Rubber Bearing and Its Application forShock Reduction/Isolation in Bridge Engineering[J].China Railway Science,2004,25(4):138-140.in Chi-nese)
[3]钟铁毅,杨风利,吴彬.铅芯橡胶支座隔震铁路简支梁桥双向地震响应分析[J].中国铁道科学,2007,28(3):38-43.(ZHONG Tieyi,YANG Fengli,WU Bin.Analysis of the Bidirectional Seismic Response for Seismically IsolatedRailway Simple Supporeted Beam Bridge by Lead Rubber Bearing[J].China Railway Science,2007,28(3):38-43.in Chinese)
[4]杨风利,钟铁毅,夏禾.铁路简支梁桥减隔震支座设计参数的优化研究[J].铁道学报,2006,28(3):128-132.(YANG Fengli,ZHONG Tieyi,XIA He.Study on Optimization of the Design Parameter of Seismic Absorptionand Isolation Bearing for Railway Simple Supported Beam Bridges[J].Journal of the China Railway Society,2006,28(3):128-132.in Chinese)
[5]曾攀,阎贵平.铅芯橡胶支座动力特性对连续梁桥地震响应的影响[J].铁道学报,2001,23(5):96-101.(ZENG Pan,YAN Guiping.Influence of Dynamic Characteristics of Lead-Rubber Bearing on Seismic Response ofContinuous Beam Bridge.[J].Journal of the China Railway Society,2001,23(5):96-101.in Chinese)
[6]张贞阁,钟铁毅,王丽.铁路连续梁桥铅芯橡胶支座的减隔震研究[J].中国安全科学学报,2003,13(5):41-45.(ZHANG Zhenge,ZHONG Tieyi,WANG Li.Study on Vibration Absorption and Isolation of Continuous BeamRailway Bridge by Lead Cored Rubber Buffer[J].China Safety Science Journal,2003,13(5):41-45.in Chi-nese)
[7]潘晋,吴成亮,仝强,等.E型钢阻尼器数值仿真及试验研究[J].振动与冲击,2009,28(7):192-195.(PAN Jin,WU Chengliang,TONG Qiang,et al.Numerical Simulation and Experimental Study on E-Shape SteelDamper[J].Journal of Vibration and Shock,2009,28(7):192-195.in Chinese)
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