Experimental investigation and calculation method for the bearing capability of bolt steel-to-laminated bamboo connections under the coupling of bending moment and shear force

Abstract

To solve the design and calculation method of the connections in modern bamboo structure, experimental investigation and calculation method for the bearing capability of bolt steel-to-laminated bamboo connections under the coupling of bending moment and shear force are presented in this article. Firstly, the bearing capability of laminated bamboo beam-column bolt connections with slotted-in steel plates was investigated by the experiment. Secondly, the analysis of the influence of different beam-column gap, bolt arrangement, built-in filler and CFRP reinforcement on the stiffness and strength of the connections are analyzed and discussed. In particular, when beam-column gap is 20 mm, there is an obvious secondary rising segment on the moment-rotation curve. Thirdly, the typical yield modes and failure characteristics of beam-column connections under the coupling of bending moment and shear force were obtained. Finally, the calculation method for the bearing capability and the theoretical prediction model of moment-rotation curves of the connections were established. The average of the lower and upper bounds was used to predict the bearing capability of the connections. The relative error was less than 10% and the calculated results were accurate. The research results could provide the reliable basis for the design and calculation of beam-column bolt connections with slotted-in steel plates in modern bamboo structure.