新型波形钢腹板组合箱梁等效阻尼比计算方法  

Calculation of Equivalent Damping Ratio of New-Type Composite Box Girder with Corrugated Steel Webs

作　　者：王力[1] 刘世忠[1] 虞庐松[1] 牛思胜[2] 毛亚娜 WANG Li;LIU Shi-zhong;YU Lu-song;NIU Si-sheng;MAO Ya-na(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Gansu Provincial Department of Transportation,Lanzhou 730030,China;Gansu Luqiao Highway Investment Co.,Ltd.,Lanzhou 730030,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]甘肃省交通运输厅,甘肃兰州730030 [3]甘肃路桥公路投资有限公司,甘肃兰州730030

出　　处：《桥梁建设》2021年第2期34-39,共6页Bridge Construction

基　　金：国家自然科学基金项目(51868040,51568036)。

摘　　要：为确定新型波形钢腹板组合箱梁等效阻尼比的合理取值,基于阻尼等效前后复频率相等原则,利用复频率和组合结构材料阻尼比之间的关系,提出新型波形钢腹板组合箱梁各阶模态等效阻尼比计算方法。采用有限元软件建立3个新型波形钢腹板组合箱梁的动力分析模型,利用该方法计算得到该新型组合结构等效阻尼比并与实测结果进行对比。结果表明:采用该方法求得的新型波形钢腹板组合箱梁等效阻尼比与试验测试结果吻合较好,进一步可说明该方法物理意义清晰明确,能够较准确地反映新型波形钢腹板组合箱梁的阻尼耗能特性。建议在对新型波形钢腹板组合箱梁进行动力特性分析时,等效阻尼比取为0.03。To determine the rational equivalent damping ratios of a new-type composite box girder with corrugated steel webs(CSWs),a method to calculate equivalent damping ratios of different vibration modes is proposed,which is based on the principle of equal damping before and after the complex frequency and takes into account the relationship between complex frequency and material damping ratios of composite structure.Finite element models of three new-type composite box girders with CSWs were established to calculate the equivalent damping ratios of the composite structures,and the calculated values were compared with the measured ones.The results show that the equivalent damping ratios gained by the proposed method agree well with the test results,further proving that the physical meaning of the method is clear,and the method can reflect the energy dissipation property of the new-type composite box girder with CSWs with relatively higher accuracy.An equivalent damping ratio of 0.03 is suggested for the dynamic property analysis of the box girder of such type.

关 键 词：波形钢腹板组合箱梁 等效阻尼比 复频率 模态阻尼矩阵 动力分析 有限元法 

分 类 号：U448.216[建筑科学—桥梁与隧道工程]