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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 the energy principle, the local vibration of orthotropic steel bridge deck is studied. The orthotropic steel bridge deck is considered as two-way stiffener. The longitudinal stiffeners and transverse partitions are equivalent to each other in terms of mass and stiffness. Mother board calculated according to the classic sheet theory. The mode shape function of the plate is expressed by the product of two independent beam mode functions. During the derivation of the frequency equation of the stiffener plate, the eccentricity and torsion of the stiffener are considered, and the film strain energy of the mother plate is taken into account. Three common The boundary conditions for instance analysis. The results show that the proposed method is in good agreement with the ANSYS software. The eccentricity of the stiffener greatly affects the low-order frequency, and the torsional stiffness of the stiffener greatly affects the high-order frequency. The equivalent orthotropic plate method is not suitable for Calculate the higher order of stiffener frequency.