G MS THESIS_final version_Maxim Prokudin.pdf - Digital Repository ...

43While it is obvious that the channels were dimensionally larger than the angles, the numberof anchor bolts supporting the channels was four times the number of anchors that the L-shape angles were supported with. A complete bearing frame design can be seen in Figure 19Hilti ® heavy duty expansion anchor bolts, 16 mm in diameter, were embedded to a depth of150 mm in the concrete walls. The process of embedding anchors into the concrete walls waspreceded by initially drilling cavities through the walls via the Hitachi hammer drill. Thewalls were internally reinforced with steel rebars and, therefore, the location of the rebars hadto be identified and taken into account when spacing the bolts and locating the holes for theC-channels. As a result, a rebar stud finder device was successfully utilized and in theprocess of construction only 3 of all 56 anchor bolts met refusal due to presence of thereinforcement bar on the way and were not embedded to a full 150 mm depth.Considering the flange of the W10x54 beam at 255 mm wide and the load distribution to be2:1 at the interface between the flange of the beam and the flange of the C-channel, the totalnumber of five anchors per every C-channel is thus engaged on each side of the beam at anypoint of load application. Therefore, every time the load is applied to the central beam, 10anchors is holding the system in equilibrium, and load distribution is of 10 percent per eachanchor. While the actual shear force imposed on each anchor bolt was estimated to besufficiently lower than the design value of 76 kN per bolt force, the design of the entiresystem was calculated to be controlled by the pull-out force of 41 kN per bolt imposed on theanchors.For this reason, the loading mechanism was not permitted to be utilized to its full designcapacity if the control beam was positioned at the very edge of the C-channel, in other words,if the central beam is placed at the back or front of the test bed, where the zone of loaddistribution at 2:1 would capture a fewer number of anchors. As a result, the use of the entireframe load system was confined by 25,000 kg maximum load that could be applied, while thecentral beam is placed no closer than 100 mm away from the edge of the C-channel.