摘要
基于能量原理研究正交异性钢桥面板的局部振动,将正交异性钢桥面板视为双向加劲板,纵向加劲肋与横隔板均按质量与刚度进行等效,加劲肋视为梁单元,母板按经典薄板理论计算。板的振型函数用2个独立的梁振型函数的乘积表示,在加劲板频率方程的推导过程中,考虑加劲肋的偏心及扭转,同时考虑母板的膜应变能,并选择3类常见的边界条件进行实例分析。研究结果表明:提出的方法与ANSYS软件计算结果比较吻合;加劲肋的偏心对低阶频率影响较大,加劲肋的扭转刚度对高阶频率的影响较大,等效正交异性板法不适于计算加劲板的高阶频率。
Based on energy principle,the local vibration of orthotropic steel bridge decks was studied.The orthotropic steel bridge deck was considered to be a stiffened plate.Both longitudinal stiffeners and transverse diaphragms were considered to be beam elements according to the equivalent principle of mass and rigidity.Besides,the plate was analyzed with classic thin plate theory.The mode shape functions were expressed by the product of two independent beam functions.During the deviation of frequency equation,eccentricity and torsion of stiffeners were considered,as well as the membrane strain energy of the plate.A stiffened plate with three classical boundary conditions was studied.The results show that the method proposed is in good agreement with the software ANSYS.The eccentricity of stiffeners has a significant influence on lower frequencies,while the torsional rigidity of stiffeners has a significant influence on higher frequencies,and the equivalent orthotropic plate method is not appropriate to compute high frequencies.
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2012年第6期88-93,共6页
China Journal of Highway and Transport
基金
国家自然科学基金项目(50978105)
关键词
桥梁工程
局部振动
能量法
正交异性
加劲板
频率方程
bridge engineering
local vibration
energy method
orthotropic
stiffened plate
frequency equation
