각형강관 트러스의 K형 접합부에 관한 연구 (1) ( A Study on the K-joints using Square Hollow Steel Sections in Truss )

The purpose of this paper is to investigate experimentally and theoretically the strength and deformation of k-joint in welded Warren-type square hollow structural section truss. There are 2 types in K-joints having one compression bracing member and one tension bracing member. One type is KP-series that brace members are rotated to 45 , another type is KS-series that are not rotated. Principal parameters are the ratio of the chord width to thickness (D/T=33.3, 25, 16.7), the ratio of brace width to chord width(d/D=0.4, 0.5, 0.67, 0.83, 1.0) and the ratio of eccenticity to chord height(e/D=0.25, 0.125, 0, -0.125, -0.25, -0.375, -0.5). The important results obtained from the experiment are as follows ; The strength of K-joints increase proportionally as the D/T ratio decreases, and the d/D ratio increases. But the e/D ratio has no correlation with the strength of K-joints. Generally the strength and ductility ratio of KP-series increase more than a current type(KS-series) in full range.