Numerical Investigation of the Behavior of MERO Joint System Under Combined Loading Regarding Helical Threads of Elements

A comprehensive finite element (FE) model of bolt-ball joint, as called MERO joint, is presented in this paper for a double layer grid structure. In double layer grids, the main internal forces are axial forces. The deflection and rotation patterns of the connector are studied under different loading conditions using the ABAQUS FE software. The applied forces on the connector are determined using displacement control. In order to take into account the connector effects in structural analysis, their behavior under combined loading should be predicted. To determine the load–displacement relationship of the MERO connection, numerical models were carried out on a connector of this type using of 3D FE method. The obtained load–displacement and moment- rotation relationships were used under different loads. The results of the FE simulation with experimental results have a good match. Compressive axial load increases the flexural stiffness of the connection and decreases the elastic bending moment. Furthermore, the equivalent stiffness of bolt with the whole of complexities was proposed.