Mechanical Properties of Moso Bamboo Connections with External Clamp Steel Plates

Song Ran,Jieyu Chen,Qike Wei,Hui Wang,Shidong Nie,Di Wu

doi:10.32604/jrm.2022.017275

Abstract

The Moso bamboo, a renewable green building material used in various new green buildings, have received extensive attention with the promotion of the concept of green buildings. To explore the mechanical properties of Moso bamboo connections with external clamp steel plates, the 16 specimens were designed by changing the bolt diameters and the end distances of the bolt holes. Their static tension tests were conducted to investigate bearing capacities and failure modes of different connection configurations. Based on test results, three failure modes of these connections were obtained, including the shear failure of bolt shank, bearing failure of bolt hole and punching shear failure of the Moso bamboo. The influence of bolt diameters and end distances of bolt holes on bearing capacities of the connections was quantitatively analyzed. Based on a simplified mechanical model, the analytical models were deduced for the bolt shear failure and the bearing failure of bolt holes. The results showed that the predictive values are in substantial agreement with the experimental results. Finally, the design and manufacturing suggestions are recommended for this Moso bamboo connections.

Highlights

The influence factors of mechanical properties of the bamboo splint under axial tension were studied, based on which the test results showed that the end distance and diameter of the bolt can affect the ultimate bearing capacity of the connections, and the effective ranges of the bolt diameter were recommended
Based on the mechanical equilibrium equations, the calculation formulas for the bolt shear failure and bearing failure were derived
This study can reveal the following conclusions: 1) The connection mechanism of MBCECSP can be divided into three development stages: initial slipping stage I, elastic deformation stage II and plastic development stage III

Summary

Introduction

The influence factors of mechanical properties of the bamboo splint under axial tension were studied, based on which the test results showed that the end distance and diameter of the bolt can affect the ultimate bearing capacity of the connections, and the effective ranges of the bolt diameter were recommended. Fu et al [10] put the steel sleeve into the bamboo tube, injected the mortar between the sleeve and the bamboo inner wall, and used steel hoops to reinforce the end of the bamboo tube Their tensile and compression tests showed that this connection had the good ductility and high load-carrying capacities, and could effectively transfer axial load. Capacities of the connection were studied based on experimental and theoretical investigations, and the theoretical formulae for the current connections were derived to provide references for the design and applications of Moso bamboo connections with external clamp steel plates or the U-shaped steel plates (hereinafter referred to as MBCECSP)

Experimental Program

Test Results and Discussions

Failure Modes

Bolt Shear Failure

Conclusions