Performance-based pushover cyclic test for innovative prefabricated hybrid industrialised building system sub-frame

Abstract

The paper presents a pseudo-dynamic cyclic load test to evaluate the structural performance of innovative prefabricated hybrid Industrialised Building System (IBS) subjected to earthquake-induced ground motions. Two beams, three columns and six wall panels with scale of 1:5 were casted using concrete grade 30. Steel bars with diameters of 6 mm and 1.5 mm were used as main reinforcement and links, respectively. The frame was set-up and tested in two reversal directions of cyclic lateral loads in the structural laboratory. Eight Linear Variable Displacement Transducers (LVDTs) and seven strain gauges were instrumented in the model to record deflections and strains. This experiment was conducted in displacement-controlled mode. Four cycles of loads were applied corresponding to the initial targeted lateral displacement to obtain hysteresis curve. The structural performance was assessed using structural seismic demand parameters such as story displacement, displacement ductility and energy dissipation. Three structural performance levels that were Immediate Occupancy (IO), Life Safety (LS) and Collapse Prevention (CP) were assessed with compliance of FEMA 356. Structural behaviour, localised stressed and failed components were checked and recorded. The experimental results were presented in load-displacement of the system, mapped crack patterns, and development of capacity curve. Damage ranking were proposed based on degree of damage of scaled 1:5 of SMART IBS frame.