ON THE EFFECTS OF CIRCULAR BOLT PATTERNS ON THE ...

geometrical configuration of bolt holes from circular to oval shape. This assists the bolts to move freely in
the bolt-holes during loading or load reversal during cyclic action. The connection zone of the beam-web
of this connection is presented in Figure 4-20. This figure shows the FEM prediction of the bearing failure
during cyclic loading of these connections. The plastic deformation of the beam web at the vicinity of the
bolts that comply the results obtained from the experimental tests is shown in this figure.
Figure 4-20 Deformation Of The Bolt-Holes From Round To Oval Due To Excessive Elongation In
Bolted/Bolted Double Web Angle Connection .
4.5.2.4 Welded-bolted Double Web Angle Connection
A 3-D finite element model of the welded-bolted double web angle connection is presented in Figure
4-21. A W24x104 hot-rolled cantilever beam is connected to a W14x159 column using two 15 in. L5x5x¾
angle on both side of the web. The angles are welded to the beam-web and bolted to the column flange
using eight ¾. in diameter high strength slip-critical bolts. A cyclic displacement control load is applied at
the tip of the beam. The details of the finite element model were discussed in Chapter-3.
Figure 4-22 shows the comparison of the experimental and FEM moment rotation hysteresis loop for
this connection. This figure show a capability of the FEM in predicting the experimental results.
Particularly, the loading and unloading values and hysteresis stiffness are identically predicted.
62