Monotonic loading testing and characterization of new multi-full-culm bamboo to steel connections
School of Engineering
The present research examines experimentally the performance of a new type of full-culm bamboo to steel bolted connection under monotonic axial loading. The examined culms are of the Kao Jue (Bambusa pervariabilis) bamboo species. The study characterizes the performance of the proposed bamboo to steel connections in terms of failure modes, load-carrying capacity and ductility. It specifically examines the influence on the mechanical behavior of (a) the end-length (i.e. the distance between bamboo culm-end and outer bolt-hole); (b) the transverse confinement provided by hose-clamps, and (c) the grouted cement mortar added within the connection zones. The findings reveal that hose-clamps effectively resist the brittle splitting behavior observed in plain bamboo to steel - bolted connections. Combined with adequate end-lengths the connections achieve remarkable gains in strength and ductility. The results also show that the mortar infill results to connections of higher strength, but often at the cost of reduced ductility, compared to the pertinent hollow-section connections with hose clamps. Importantly, the analytically estimated yield loads of the examined connections using the European Yield Model are in good agreement with the experimentally determined values.