预应力混凝土系杆拱桥的振动特性  

Vibration Characteristic of PC Tie-arch Bridge

作　　者：张瑞杰[1] 刘世忠[2] 

机构地区：[1]西北民族大学土木工程学院,甘肃兰州730030 [2]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《工程抗震与加固改造》2007年第3期6-9,13,共5页Earthquake Resistant Engineering and Retrofitting

摘　　要：以相似理论为基础分析了兰州新城黄河大桥系杆拱结构与模型桥自振频率和振型的相似关系。对新城黄河大桥系杆拱结构进行了模型动力试验,并对模型实验结果与理论计算结果及实测结果进行了对比。研究了该桥的自振特性,得出了该桥竖平面内一阶自振频率接近汽车的竖向振动频率,从而汽车过桥时容易引起该桥共振的结论。通过计算狄克曼指标解释了汽车过桥时桥上行人震感明显的现象。分析了该桥的加固效果,为预应力混凝土系杆拱桥的加固设计提供了理论依据。The similarity relationships of nature frequency and mode between tied-arch bridge superstructure of Lanzhou Xincheng Yellow River Bridge and model bridge are analyzed based on similarity theory. Dynamic test is carried on the model of tied-arch bridge superstructure of Lanzhou Xincheng Yellow River Bridge. Model test results are compared with calculating results and actual measurement result. The bridge＇s nature vibration characteristic is studied. The conclusion that the first order nature frequency in vertical plane closed to vertical vibration frequency of automobile thus caused the bridge to resonate easily when the automobile pass is obtained. The phenomenon of people feel obvious shake when automobile pass the bridge by calculating the Diekemann norm is explained. The reinforcement effect of the bridge is analyzed. The result of the study supplies the theoretical basis for the reinforcement of PC tie-arch bridge.

关 键 词：桥梁工程 自振频率 模型试验 系杆拱桥 相似理论 加固 

分 类 号：U448.225[建筑科学—桥梁与隧道工程]