Abstract
Bamboo structures have various types of connections, such as bolting and lashing. One crucial issue in bamboo structures is that the connection with bolts and nails has a lower load-carrying capacity associated with the bamboo failure resulting from the bolt or nail invading them. This paper focuses on the connection for raw bamboo members with steel hoops (BHC), of which the two semi-circular steel hoops are fastened to the raw bamboo with high-strength bolts. The sliding friction is controlled by the interfacial pressure, which can be increased by tightening the bolts. A push-out experiment on thirty-six specimens was conducted considering the following two parameters: the different surface conditions of raw bamboo (with or without the epidermis) and the different interfacial pressure. The test results mainly showed the two failure modes of specimens under certain conditions: continuous longitudinal slip after the vertical load reached the peak; and the steel hoop stuck in the bamboo skin after a period of slip. It is found that the sliding friction was controlled by the interfacial pressure, and the difference in the anti-sliding capacity between the epidermal bamboo specimen and the non-epidermal bamboo specimen was magnified with the increase of interfacial pressure. The contact stress on the surface of bamboo is approximately uniformly distributed based on the finite element analyses. The interfacial pressure can be predicted by the torque value of the digital electronic torque wrench and the equations established by mechanical analysis, respectively. Moreover, the design formulae of bearing capacity for BHC under three guaranteed rates (50%, 95%, and 99.9%) were developed based on probability theory, while the fourth design formula was derived by regression analysis. The reliability indices of the four design formulae were up to 0.07, 1.44, 3.09, and 0.97, respectively, and the resistance partial coefficients were suggested accordingly.
Highlights
Bamboo is an environmentally-friendly building material with excellent mechanical properties, especially tensile and compressive strength [1]
Comparing the the whole whole loading bebe divided into twotwo catcategories, which correspond to two failure modes, respectively
Typical specimens are egories, which correspond to two failure modes, respectively
Summary
Bamboo is an environmentally-friendly building material with excellent mechanical properties, especially tensile and compressive strength [1]. Bolts were introduced in bamboo connections of bamboo structures (Figure 1b,c) [6,7,8,9,10], which change the way the bamboo structure is connected They are widely used in modern construction by employing modern tool electric drill machines. It possesses the following disadvantages: (1) The bearing capacity of the raw bamboo is weakened due to the drilling and cutting of raw bamboo; (2) The connections need to be reinforced by grouting, outer hoop, and other reinforcement, which increase fabrication difficulty and cost; (3) Because the raw bamboo
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