Finite element analysis on behavior of β=0.8 RHS trusses with concrete-filled in Partial chords

Finite element analysis on three trusses were carried in order to study the effect for behavior of rectangular hollow section (RHS) truss with the concrete filled in partial chord. The first specimen was a RHS truss, the second one was a RHS truss with concrete-filled in the compressive chord, and the third one was a concrete-filled steel tube truss. The results show that the failure of three trusses were due to the joint failure, however the failure modes were different and changed by the concrete filled in chord. The bearing capacity of three trusses were controlled by the joints and the strength and stiffness of joints were increased by the concrete filled in the chord, therefore the bearing capacity of trusses were increased while the deformation of trusses were decreased. The RHS truss with concrete-filled in partial chord have some distinct advantages in engineering application, because the steel tube joint can meet the requirements of the plastic deformation and the concrete filled in chord can improve the bearing capacity of truss.