摘要
本文以贵州省某特大悬索桥为工程背景,采用ANSYS有限元软件,开展了风荷载作用下桥梁主桥结构动力特性研究,研究结果表明:成桥状态加劲梁一阶对称竖弯频率和一阶对称扭转频率分别为0.1586Hz和0.3136Hz,扭弯频率比为ε=1.9773;加劲梁一阶对称竖弯振型对应的竖向振动等效质量为28.5t/m,加劲梁一阶对称扭转振型对应的扭转等效质量惯性矩为3370.0t·m^(2)/m;成桥状态加劲梁一阶反对称竖弯频率和一阶反对称扭转频率分别为0.1096Hz和0.4148Hz,扭弯频率比为ε=3.8175;加劲梁一阶反对称竖弯振型对应的竖向振动等效质量为31.8t/m,加劲梁一阶反对称扭转振型对应的扭转等效质量惯性矩为3890.0t·m^(2)/m。可以为后续桥梁抗风研究奠定基础。
In this paper,taking a super large suspension bridge in Guizhou Province as the engineering background,the dynamic characteristics of the main bridge structure under wind load are studied by using ANSYS finite element software.The results show that the first-order symmetric vertical bending frequency and the first-order symmetric torsion frequency of stiffening beam are 0.1586Hz and 0.3136Hz respectively,and the torsion to bending frequency ratio isε=1.9773;the first-order symmetric vertical bending vibration mode of stiffening beam corresponds to each other The results show that the equivalent mass of the vertical vibration is 28.5t/m,and the torsional equivalent mass inertia moment corresponding to the first symmetric torsional mode of the stiffening beam is 3370.0t·m^(2)/m;the first antisymmetric vertical bending frequency and the first antisymmetric torsion frequency of the stiffening beam are 0.1096Hz and 0.4148Hz respectively,and the torsion to bending frequency ratio isε=3.8175;the equivalent vertical vibration mass corresponding to the first-order antisymmetric vertical bending mode of the stiffening beam is 31.8t/m,The torsional equivalent mass moment of inertia corresponding to the first antisymmetric torsional mode of the stiffened beam is 3890.0t·m^(2)/m,which meets the requirements of the code.it can lay the foundation for subsequent bridge wind resistance research.
作者
张剑锋
李谭飞
蓝先林
杨友娣
Zhang Jianfeng;Li Tanfei;Lan Xianlin;Yang Youdi(Guizhou Transoprdation Planning Surver﹠Design Academe Co.,Ltd.,Guiyang 550081,China;Highway Construction and Maintenance Center of Song tao Miao Autonomous County,Tongren 554109,China)
出处
《青海交通科技》
2022年第1期110-113,131,共5页
Qinghai Transportation Science and Technology
关键词
桥梁结构动力特性
风荷载
加劲梁
振型
频率
dynamic characteristics of bridge structure
wind load
stiffened beam
mode frequency
