Experimental study on mechanical behavior of bolted steel-neosinocalamus affinis-based bamboo scrimber and steel connections

Abstract

Bamboo materials are known for their excellent toughness and seismic performance, which makes them a promising option for advancing their application in the field of structural engineering to enhance the seismic resilience of engineering structures. This study focused on mechanical behavior of bolted steel-neosinocalamus affinis-based bamboo scrimber and steel connections, and conducted shear test research and analysis on 54 specimens divided into 18 groups,aiming to promote the application of bamboo scrimber in the field of structural engineering. The study indicates that connections with thin steel plates (t = 0.5d, t=Id) predominantly exhibit a single-hinge yield mode, while those with thick steel plates (t=2d) are inclined towards a double-hinged yield mode. The yield and ultimate load-carrying capacities of a connection are enhanced with the increase in bolt diameter. However, the influence of the steel plate’s strength grade on these capacities is minimal. The yield load-carrying capacity of connections with thick steel plates has a significant increase compared with the connection with thin steel plates. The thickness of the steel plate does not significantly affect the connection ultimate load-carrying capacity. The initial stiffness of a connection is positively correlated with the bolt diameter, yet it remains unaffected by variations in the steel plate’s thickness. The stiffness of a connection is categorized into two distinct types based on the steel plate strength grade. Connections using steel plates with a strength grade above Q235 exhibit similar stiffness levels, which are consistently higher than those using Q235-grade steel plates. The angle between the load direction and the grain direction has an effect on the connection ductility. The ductility coefficient across various connections predominantly centers around 2.5. The research also validates that the Foschi theoretical model, traditionally applied to wood structures with bolted, nailed, and similar dowel-type connections, accurately delineates the nonlinear load-displacement behavior of bolted steel-bamboo scrimber and steel connections for the entire duration of the process. When comparing the same configurations, connections utilizing neosinocalamus affinis-based bamboo scrimber demonstrate a higher load-carrying capacity than those using phyllostachys pubescens-based bamboo scrimber, with a maximum enhancement in load-carrying capacity of 18%. The design carrying capacity meets the test load requirements for the given end distances of 7d. This research can provide theoretical support for the engineering application of neosinocalamus affinis-based bamboo scrimber.

Keywords

bolted steel-bamboo scrimber and steel connection / ductility,failure modes / initial stiffness / load-carrying capacity

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