Abstract
To take full advantages of the bamboo and cold‐formed thin‐walled steel, a new type of box section beam combined with bamboo and steel channel was proposed in this paper. Five composite beams with different parameters were tested to evaluate the effects of bamboo plywood thickness of composite beams and thickness and sectional dimension of steel channel. The results of experiment showed that the proposed composite beams exhibited excellent flexural bearing capacities and stiffness. The increase of bamboo plywood thickness and sectional dimension of steel channel could improve bearing capacity and flexural stiffness of composite beams, while the increase of steel thickness could enhance the bearing capacity and safety margin of composite beams. Furthermore, a new method to predict the deformation and bearing capacities of composite beams was proposed and matched well with the experimental results.
Highlights
With the development of the society, green, sustainable, and ecologically materials are required to be employed for the construction
Effect of ickness and Sectional Dimension of Steel Channel. e load-deflection curves of B-3 and B-4 are compared in Figure 9, and it can be found that the increased thickness of thin-walled steel can improve ultimate load and safety margin of composite beams, while having little effect on flexural stiffness
The load-deflection curves of B-3 and B-5 are compared in Figure 10, and it can be found that the increase of the height of steel channel could improve the ultimate bearing capacity and flexural stiffness. at is because the increase of height of steel channel can increase both the inertia moment and area of cross-section effectively
Summary
With the development of the society, green, sustainable, and ecologically materials are required to be employed for the construction. In-walled cold-formed steel is one of the common construction materials with ultrahigh strength, while the steel members generally cannot reach its ultimate strength due to the buckling. Based on these considerations, a new bamboo-steel composite structure is proposed. E bamboo-steel composite structure can take the advantages of light weight and high strength of the two materials, while avoiding the disadvantages of easy buckling of cold-formed thin-walled steel. A new type of box section bamboo-steel composite beam, which consisted of four pieces of bamboo plywood and two pieces of cold-formed thin-walled steel channel, is proposed. A new type of box section bamboo-steel composite beam, which consisted of four pieces of bamboo plywood and two pieces of cold-formed thin-walled steel channel, is proposed. en, five composite beams proposed above were tested. e flexural behaviours of the composite beams were analysed and compared. e influence of the bamboo plywood thickness and the thickness and sectional dimension of steel channel were studied in this paper
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