大跨度预应力混凝土连续刚构桥自振特性分析
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摘要
以大准铁路增二线内蒙古黄河连续刚构特大桥为工程背景,分析了其自振特性,研究了桥墩高差、边中跨比对大跨度预应力混凝土连续刚构桥自振特性的影响.研究表明:随桥墩高差愈大,结构3个方向的基频越大;随边中跨比增大,其3个方向的基频都有减小趋势.研究结果可为同类大跨度预应力混凝土连续刚构桥梁的抗震设计提供参考.
With the continuous rigid-structured mega bridge across the Yellow River in Inner Mongolia of the 2nd Added Line of the Dazhun Railway as a practical example,the natural vibration characteristics of the bridge is analyzed.And the influence of elevation difference of pier and ratio of side span to mid span on natural vibration characteristics of continuous rigid-frame bridge is studied.The result of our research shows that the bigger elevation difference of pier is,the greater three-direction basic frequency is.With the increasing of ratio of side span to mid span,the three-direction basic frequency has the decrease trend.The research results may be applied to earthquake resistance design of the long-span continuous pre-stressed concrete rigid-frame bridges.
With the continuous rigid-structured mega bridge across the Yellow River in Inner Mongolia of the 2nd Added Line of the Dazhun Railway as a practical example,the natural vibration characteristics of the bridge is analyzed.And the influence of elevation difference of pier and ratio of side span to mid span on natural vibration characteristics of continuous rigid-frame bridge is studied.The result of our research shows that the bigger elevation difference of pier is,the greater three-direction basic frequency is.With the increasing of ratio of side span to mid span,the three-direction basic frequency has the decrease trend.The research results may be applied to earthquake resistance design of the long-span continuous pre-stressed concrete rigid-frame bridges.
引文
[1]王立峰,孙勇,王子强.结构参数对刚构—连续组合梁桥动力特性的影响分析[J].东北林业大学学报,2010,38(6):106-108.
[2]董淑喜,靳奉涛.青岛海湾大桥沧口航道桥自振特性分析[J].公路,2009(9):11-13.
[3]徐贤昭,董继恩,王欣南.石佛沟特大桥抗震特性探讨[J].中外公路,2010(5):200-203.
[4]潘强.高墩大跨连续刚构桥地震反应分析及减震措施[D].合肥:合肥工业大学,2010.43-45.
[5]霍新.高墩大跨连续刚构桥地震反应分析[D].北京:中国地震局地球物理研究所,2006.27-30.
[6]靳志刚,左德中.大跨度预应力混凝土连续刚构桥合理边中跨比研究[J].交通科技,2010(3):31-34.
[2]董淑喜,靳奉涛.青岛海湾大桥沧口航道桥自振特性分析[J].公路,2009(9):11-13.
[3]徐贤昭,董继恩,王欣南.石佛沟特大桥抗震特性探讨[J].中外公路,2010(5):200-203.
[4]潘强.高墩大跨连续刚构桥地震反应分析及减震措施[D].合肥:合肥工业大学,2010.43-45.
[5]霍新.高墩大跨连续刚构桥地震反应分析[D].北京:中国地震局地球物理研究所,2006.27-30.
[6]靳志刚,左德中.大跨度预应力混凝土连续刚构桥合理边中跨比研究[J].交通科技,2010(3):31-34.