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框架结构和大跨度拱结构是工程中广泛应用的结构形式.在水平激励作用下,框架结构的抗侧刚度主要由竖向构件的抗弯刚度和抗剪刚度提供,是典型的弯剪型结构;而拱结构以构件的轴向刚度为结构主要刚度,是典型的轴力型结构.二者的振型特性均具有较强的代表性.本文以集中质量法为基础,锁定节点质量变量,考察两种结构的振型几何坐标与振型参与系数的关系,获得弯剪型结构和轴力型结构的振型特征.数值分析结果对比表明,弯剪型框架结构振型参与系数值按振型阶数递减,而轴力型拱结构的振型参与系数值与阶数并无规律可循.
The frame structure and the long-span arch structure are the widely used structural forms in engineering.In the horizontal excitation, the lateral stiffness of the frame structure is mainly provided by the flexural rigidity and the shear stiffness of the vertical component, which is a typical bending and shear structure The axial rigidity of the arch structure is the main stiffness of the structure and is a typical axial force structure.The vibration mode characteristics of the two arch structures are highly representative.This paper focuses on the mass quality method, The relationship between the geometrical coordinates of the two structures and the participation coefficient of the mode shapes was investigated, and the mode shapes of the shear-and-shear structure and the axial force structure were obtained. Comparing the numerical results, it was found that the bending mode- Type order decreases, while the axial force arch structure modal value and order of participation and no rules to follow.