Comparative Research on Mechanical Behavior of Column-Bracing System between Fixed-Ended and Pin-Ended Column Base

Abstract

In order to investigate the different mechanical behavior of column-bracing system between fixed-ended and pin-ended column base, a large number of column-bracing systems with fixed-ended and pin-ended column base were studied using the ANSYS program, in which random combination of the initial imperfections between columns and braces was well considered by the Monte Carlo method. Based on the above comparative study, probability density function of the bracing force was found through probability statistics and the design bracing force is obtained. The results show that the ultimate load-carrying capacity and the bracing forces of the mid-height horizontal braces of column-bracing systems with pin-ended column base are higher than that of column-bracing systems with fixed-ended column base, and the higher ultimate load-carrying capacity of the former more significantly increases the bracing forces of the mid-height horizontal braces; that the bracing forces of the mid-height horizontal braces in compression or in tension have also randomness because of the randomness of the initial imperfection of both columns and braces.