多层刚架剪切振动及模态矩阵

SHEAR VIBRATION AND THE MODAL MATRIX FOR THE MULTISTORY RIGID FRAMES

将多层刚架系统离散成一系列运动质体，按达伦伯原理建立各质体运动方程。对特征值、主振型、正则化和模态矩阵都作了简明叙述。用算例表明其实用价值。

In this paper a building of the multistory rigid frames is separated into a series of free motion bodies.According to D'alembert's principle the system of the motion equations is derived.The normal modes of vibrations, the eigenvalues,the normalization modal shapes and the modal matrix are described briefly with some practical examples for use.