Static test and theoretical study on semirigid pin joint for modular steel reticulated shell

Abstract

SummaryIn order to realize the modularity and rapid assembly of steel reticulated shells in the construction site, a new type of simple assembled joint named semirigid pin joint is proposed for modular steel reticulated shell in this paper. While on the premise of meeting the stiffness and strength requirement, complicated procedures such as tightening nuts and controlling pretightening force are avoided in this joint. In addition, the joints can adapt to the complex curvature changes of reticulated shells. When it is connected in the middle of the member, the new joint can realize the connection of arc members. First, experiments were carried out on different screw rod diameters, wing plate pin diameters, and the number of wing plate pins. Different failure modes and M–Φ curves of semirigid pin joints were obtained. The stiffness and strength of the joints were studied. Second, a three‐dimensional finite element model of the joint was established by ABAQUS, and the comparison between the simulated results and the experimental results proved the accuracy of the finite element numerical analysis. On this basis, the antirotation stiffness, strength, and failure mode of the new joint with different parameters were compared and discussed, and the influence law of each parameter on the mechanical properties of the new joint was obtained. Finally, based on the power function model, a theoretical analysis model for estimating the M–Φ curve of the joint was established. Compared with the results of the experiments, the results indicated that the prediction formula has high accuracy.