双柱墩桥梁的横向抗震设计研究
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摘要
基于有限元软件SAP2000,以实际连续梁桥工程为背景,建立无系梁双柱墩、系梁双柱墩及盖梁双柱墩桥梁模型,分析不同形式的双柱墩对桥梁横向动力特性和弹性地震反应的影响。然后,采用延性抗震设计方法,对3种形式的桥墩及基础进行抗震分析,并着重对墩柱、基础、支座的地震需求进行比较。结果表明,增设横系梁显著改善墩柱自身的抗弯性能,但对固定支座、墩柱抗剪以及基础的抗震不利。
With the background of a practical continuous bridge project, 3 bridge models are established, including double-column pier without straining beam, double-column pier with straining beam and double-column with cap beam on the basis of finite element software SAP2000. Transverse dynamic characteristics and influences on elastic earthquake response of different doublecolumn types are analyzed. Then, ductility seismic design method is used to analyze the seismic demand(pier, foundation and bearing) of different piers and foundations, and the results show that adding straining beam can significantly improve the flexural behavior of the pier, but it does no good for seismic demands of fixed bearing shear, pier shear as well as foundation.
With the background of a practical continuous bridge project, 3 bridge models are established, including double-column pier without straining beam, double-column pier with straining beam and double-column with cap beam on the basis of finite element software SAP2000. Transverse dynamic characteristics and influences on elastic earthquake response of different doublecolumn types are analyzed. Then, ductility seismic design method is used to analyze the seismic demand(pier, foundation and bearing) of different piers and foundations, and the results show that adding straining beam can significantly improve the flexural behavior of the pier, but it does no good for seismic demands of fixed bearing shear, pier shear as well as foundation.
引文
[1]燕斌,冯云成.高烈度区桥墩系梁对桥梁抗震性能的影响[C]//.中国科学技术协会学会学术部.自主创新与持续增长第十一届中国科协年会论文集:3.北京:[出版者不详],2009:1-6.
[2]兰峰,王克海.中小跨径双柱式高墩桥梁横系梁对抗震性能的影响[J].公路交通科技,2011(5):92-97.
[3]沈星,叶爱君,王晓伟.柔性横系梁双柱墩的抗震行为分析[J].同济大学学报,2013(3):342-347.
[4]沈星,叶爱君,王晓伟.双柱墩弹塑性位移能力简化计算[J].同济大学学报,2014(4):513-519.
[5]中华人民共和国住房和城乡建设部.CJJ 166—2011城市桥梁抗震设计规范.北京:中国建筑工业出版社,2011.
[2]兰峰,王克海.中小跨径双柱式高墩桥梁横系梁对抗震性能的影响[J].公路交通科技,2011(5):92-97.
[3]沈星,叶爱君,王晓伟.柔性横系梁双柱墩的抗震行为分析[J].同济大学学报,2013(3):342-347.
[4]沈星,叶爱君,王晓伟.双柱墩弹塑性位移能力简化计算[J].同济大学学报,2014(4):513-519.
[5]中华人民共和国住房和城乡建设部.CJJ 166—2011城市桥梁抗震设计规范.北京:中国建筑工业出版社,2011.
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