高墩刚构桥系梁抗震分析
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摘要
为研究系梁对高墩刚构桥抗震性能的影响,以系梁设置位置、系梁与桥墩截面刚度比以及系梁模拟方式为基本参数,通过分析结构动力特性及地震响应的变化,研究系梁对结构抗震性能的影响。研究结果表明:设置系梁后,桥梁的横桥向抗震性能降低,桥墩和系梁均成为抗震设计的薄弱环节;从提高结构整体抗震性能的角度出发,在墩中设置系梁效果最优,其中系梁与桥墩截面刚度比取0.5效果最优;系梁端部出现塑性铰后,对结构抗震性能的影响很小,可预先将系梁设计为与墩身铰接,以兼顾静力性能、动力性能和稳定性要求。
Seismic analysis was done to investigate the influence of tie beam to seismic performance of rigid frame bridge with high pier.Choosing the set location of tie beam,stiffness ratio of tie beam and pier's section,and simulation methods of tie beam as the three basic parameters,the influence of tie beam to the structure earthquake resistance performance was studied through analyzing the changes of the dynamic performance and the earthquake responds.The results show that the transverse seismic performance of bridge is decreased by tie beam,while pier and tie beam become the weak link of seismic design.On the point of getting relatively better seismic performance of the whole structure,the set location of tie beam at the middle of pier is the best way,while stiffness ratio of tie beam and pier's section is chosen as 0.5.The tie beam have little impact on seismic performance when plastic hinge occurred at its end,the tie beam can be pre-designed to articulate with pier to meet the requirements of static performance,dynamic performance and stability.
Seismic analysis was done to investigate the influence of tie beam to seismic performance of rigid frame bridge with high pier.Choosing the set location of tie beam,stiffness ratio of tie beam and pier's section,and simulation methods of tie beam as the three basic parameters,the influence of tie beam to the structure earthquake resistance performance was studied through analyzing the changes of the dynamic performance and the earthquake responds.The results show that the transverse seismic performance of bridge is decreased by tie beam,while pier and tie beam become the weak link of seismic design.On the point of getting relatively better seismic performance of the whole structure,the set location of tie beam at the middle of pier is the best way,while stiffness ratio of tie beam and pier's section is chosen as 0.5.The tie beam have little impact on seismic performance when plastic hinge occurred at its end,the tie beam can be pre-designed to articulate with pier to meet the requirements of static performance,dynamic performance and stability.
引文
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[2]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,2002.
[3]JTG/T B02—01—2008,公路桥梁抗震设计细则[S].
[4]范立础,卓卫东.桥梁延性抗震设计[M].北京:人民交通出版社,2001.
[5]周勇军.高墩大跨曲线连续刚构桥梁地震响应的设计参数研究[D].西安:长安大学,2006.
[6]李永乐,邸月龙,赵彤,等.大跨高墩城市轨道交通斜拉桥动力特性及抗刚性能[J].建筑科学与工程学板,2010,27(4):19-24.LI Yong-le,DI Yue-long,ZHAO Tong,et al.Dynamiccharacteristic and wind resistance behavior of high-pier long-span cable-stayed bridge for ubun rail tran-sit[J].Journal of Architecture and Civil Engineering,2010,27(4):19-24.
[7]刘健新.汶川地震桥梁破坏及桥梁抗震设计规范对比[J].筑路机械与施工机械化,2010,27(11):20-23.LIU Jian-xin.Damage of bridges in Wenchuan earth-quake and comparison of specifications for anti-seis-mic design of bridges[J].Road Machinery&Con-struction Mechanization,2010,27(11):20-23.
[8]日本铁道综合技术研究所.铁道构造物等设计标准及解说V抗震设计[Z].东京:丸善株式会社,2000.
[9]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:自然科学版,2009,29(4):48-52.HE Han-xin,LIU Jian-xin.Application of capacityspectrum method in anti-seismic evaluation of bridges[J].Journal of Changan University:Natural ScienceEdition,2009,29(4):48-52.
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