Static behaviour of latticed-sleeved compression member with strip core

摘要

In this study, a finite element model was established and validated to investigate the mechanical behaviour of the latticed-sleeved compression member with strip core. Failure mechanism of the latticed-sleeved compression member was studied based on the core moment distribution and the effects of three reinforcement methods to increase the ultimate bearing capacity were compared. A parametric study was performed to investigate the effects of essential factors on the mechanical behaviours of the latticed-sleeved compression members. A method was adopted to control global buckling of the latticed-sleeved compression members. Based on the latticed-sleeved compression member, a capacity-monitoring member was introduced to control buckling and monitor the bearing capacity of the key compression member. It is concluded that: the latticed-sleeved compression member has a greater resistance to buckling; mutual effects exist between the two failure modes, local buckling of the core segment and global buckling of the latticed-sleeved compression member; the gap between the core and sleeve, the sleeve stiffness and the core protrusion length above sleeve have effects on the mechanical behaviors of the latticed-sleeved compression members; the adopted method considering the mutual effects between the two failure modes can effectively control global buckling of the latticed-sleeved compression members; and the bearing capacity of latticed-sleeved compression member can be monitored through measuring the resultant axial force of the connecting bolts.