1. College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;
2. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China;
3. Ningbo University, Ningbo 315211, China
To investigate the hysteretic behavior of spiral-confined lattice steel reinforced concrete (SLSRC) columns, 10 specimens including one reference specimen of lattice steel reinforced concrete column and one reference specimen of spiral stirrup reinforced concrete column were designed and subjected to lateral cyclic load. The axial compression ratio, stirrup reinforcement ratio, indirect reinforcement mode and type of cross section were considered to design the specimens. The failure modes, hysteretic curves and skeleton curves were obtained. The ultimate load-carrying capacity, floor displacement angle, ductility, energy dissipation, strength drop-off and stiffness degeneration of the specimens were studied and analyzed. Results showed that the flexural failure and bond failure were main failure modes for SLSRC columns. The hysteretic curves of SLSRC columns were fuller and the ultimate load-carrying capacity, ductility and energy dissipation were higher, compared to that of lattice steel reinforced concrete column and spiral stirrup reinforced concrete column. The ultimate load-carrying capacity, stiffness and energy dissipation capacity were increased, but the ductility and deformability were decreased. The strength drop-off and stiffness degeneration were severer with the increase of axial load ratio. With the increase of spiral stirrup reinforcement ratio, the ultimate load-carrying capacity, stiffness, ductility, energy dissipation and deformability increased gradually. Increasing the spiral stirrup reinforcement ratio has better effect than increasing the steel batten ratio for the improvement of ductility and energy dissipation. However, it is opposite for the increase of load-carrying capacity. The type Ⅲ SLSRC column exhibited the best mechanical properties in all kind of SLSRC columns.