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| 曲线梁桥振型主方向判定方法研究 | |
| 引用本文： | 邢世玲,叶见曙,余波.曲线梁桥振型主方向判定方法研究[J].公路交通科技,2010,27(2). |
| 作者姓名： | 邢世玲 叶见曙 余波 |
| 作者单位： | 1. 东南大学,交通学院,江苏,南京,210096;南京工业大学,土木学院,江苏,南京,210009 2. 东南大学,交通学院,江苏,南京,210096 3. 北京公科固桥技术有限公司,北京,100088 |
| 基金项目： | 地震行业科研专项经费项目(200808081) |
| 摘 要： | 由于曲线梁桥独特的构造特点,其振型存在"弯扭耦合"现象。为了判定曲线梁桥各阶"弯扭耦合"振型的主方向是弯曲或纯扭转,把曲线梁桥的每阶振型分解为竖向弯曲、纯扭转、横向弯曲和纵向移动4个子方向,把每阶振型的能量亦分成竖向弯曲能量、扭转能量、横向弯曲能量和沿纵向平移能量4个方向上的能量,引入4个方向参数来分别表示各子方向能量所占各阶振型能量的比值。然后从结构动力学理论知识出发,根据无阻尼系统每阶振型动能和变形能之和为常数的基本原理,推导了4个方向参数的计算公式,推导结果显示,方向系数仅为结构质量、截面几何特性和振型向量的表达式。最后提出了一种根据方向参数值的大小判定曲线梁桥各阶振型以哪个子方向为主的方法,并通过实例介绍了该方法的应用。 |
| 关 键 词： | 桥梁工程 曲线梁桥 能量守恒原理 振型 方向参数 弯扭耦合 |
A Method to Determine Main Direction of a Curved Bridge's Mode Shape |
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| XING Shiling,YE Jianshu,YU Bo.A Method to Determine Main Direction of a Curved Bridge's Mode Shape[J].Journal of Highway and Transportation Research and Development,2010,27(2). | |
| Authors: | XING Shiling YE Jianshu YU Bo |
| Institution: | 1.School of Transportation;Southeast University;Nanjing Jiangsu 210096;China;2.School of Civil Engineering;Nanjing University of Technology;Nanjing Jiangsu 210009;3.Beijing Gongke Bridge Technology Co.;Ltd.;Beijing 100088;China |
| Abstract: | Due to the special construction feature,the mode shape of a curved bridge has flexure-torsion coupling situation.In order to determine whether the main direction of the mode shape is flexure or torsion,each mode shape was divided into four sub directions which are vertical bending,pure torsion,transverse bending and longitudinal shift respectively.Accordingly,the energy of each mode was also subdivided into four directions.The ratios between the energy of sub direction and the total energy of a mode were de... |
| Keywords: | bridge engineering curved bridge energy conservation principle mode shape direction parameter flexure-torsion coupling |
| 本文献已被 CNKI 万方数据 等数据库收录！ | |