为验证等效梁法的可靠性，运用有限元法对框架式地道桥的动力特性进行了分析。
To test and verify the reliability of equivalent beam method, finite element method is applied to the analysis on dynamic characteristic of frame style subway bridge.
通过和单自由度线性弹簧-质量-阻尼系统进行比较，得到该带裂缝梁结构的等效自然频率和等效粘滞阻尼比。
The equivalent viscous damping ratio and the equivalent natural frequency are obtained by comparing the system with a purely linear, spring-mass-damper system of single freedom.
导出了变截面梁单元的单元刚度矩阵、单元等效节点荷载和单元一致质量矩阵。
The stiffness matrix, equivalent nodal load and consistent mass matrix are derived for the beam element with variable cross-section.
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