بررسی عملکرد سیستمهای قاب با ستون پیوند شده (LCF) طراحی شده به روش مستقیم مبتنی بر تغییرمکان

Abstract

The linked column steel frame system (LCF) is a new load resistant system; that by using replaceable ductile links, it can provide the desired structural behavior. The optimal performance of this system can be achieved by controlling the displacements and the sequence of yielding of fuses in the structure. Direct displacement-based design (DDBD) method is one of the most powerful performance-based design methode that has the ability to control the behavior of the structure. The aim of this study was to investigate the performance of LCF systems designed by DDBD method. For this purpose, 8 sample structures with 3, 6, 9 and 12 stories and with different configurations, were designed with DDBD method; and then their behavior was investigated by nonlinear static analysis. The results showed that in the design base shear calculated with DDBD method, almost most of the links of the studied structures were yield; While all the beams of the modified moment frame remained elastic. This result, show the ability of the DDBD method to produce LCF systems with controlled behavior. The results of the overstrength review of the studied structures also indicate that the overstrength of LCF systems designed with DDBD method depends on the height and configuration and the average value of this coefficient was 1.23. Also, the average inherent overstrength coefficient of the structural samples was calculated to be 0.48. This result indicates the ability of the LCF systems designed by the DDBD method to achieve their desired failure mechanism.