Geometry of Connection Models

Dimensions of connection models for FE analysis are shown in Table 1 corresponding to the de­scriptions of column and beam section sizes, in which the connection parameters listed in Table 1 are shown in Figure 1. The other connection parameters are kept constant in all connection models and those are also shown in Figure 1. In this table, test specimens A1 and A2 were taken from the experiments of Azizinamini et al. (1985) and Test 3 was taken from Harper’s thesis (1990). Specimens for numerical analysis are the same to those of test specimens A1, A2, and Test 3 and the specimens for numerical simulation in case varying some parameters of test specimen are also listed in Table 1. In those specimens ‘np’ means that pretension of bolts is ignored. Nominal name and geometrical dimensions for all column and beam sections considered here are determined following the AISC-LRFD specification (1994). As an example of mesh geometries of connection, a half model of A2 is shown in Figure 2. In this model, the total number of elements and nodes are 10,330 and

Fig. 2. Mesh pattern of FEA model A2.

17,984, respectively. All components including bolts are composed of eight node solid elements. Bolts in the mesh are divided into shank, head and nut elements to consider their individual effects on connection behavior. The diameter of bolt hole is set to be 1.6 mm (1/16 in) larger than that of bolt in accordance with Azizinamini et al.’s (1985) test data.