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

compared with results collected from finite element models. The detail and results of this study are
elaborated in detail in the following sections.
3.2.2 Test Specimen
The experimental investigation was conducted on three T-Stubs as part of this study. The W12x72
hot-rolled beam was cut into half through the mid-height of the web and flanges were positioned against
each other to form the T-Stubs. Grade 50 beam and ½ in. diameter ASTM A325 bolts with 125-ksi
ultimate strength were used during this investigation. The tensile force was applied monotonically and
the specimens were loaded to their ultimate failure.
To fabricate the specimens, the exact positions of the bolt-holes were marked by pointer and the
bolt-holes were drilled using the drill-press. The contact surface was washed by soap and brushed by
electric wire-brush to meet the Class-C surface specified in AISC design manual [1]. Finally, the
specimens were coated by white-wash to simplify the visual observation of the yield patterns. Figure 3-3,
and
Figure 3-4 illustrate the final product of the TS-L, TS-S, and TS-C specimens prior to testing,
respectively.
Figure 3-2 Final Product Of The TS-L Specimen
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