b'STEEL COLUMN BASES Under Combined Axial Load and Bi-Axial BendingBy Dr. Muntasir Billah,P.Eng. Assistant Professor, Department of Civil Engineering, Lakehead Universityresults from Gomez et al. (2010, large scale experimenttestno.1).ThisspecimenwasBase plate to top testedmonotonicallywithoutanyaxialColumn to base plate (gravity) load and having 10.6 per cent peak columndrift.Fig.1showsthecomparison of the experimental and numerical results in terms of anchor rod force and column drift. FromFig.1,itcanbeconcludedthatthe developed numerical model can predict theBase plate to Base plate to experimental results with reasonable accuracy.groutThemaximumanchorrodforceisfoundAnchor rod to nut and 220.12 kN and 213.24 kN for the experimentalwasherand numerical results, respectively having a 3Fig. 2: Overview of the nite element model per cent difference between them. FIGURE 2:Overview of the finite element modelBASE CONNECTION RESPONSE UNDER UNIAXIAL AND BI-AXIAL BENDINGAs the first phase of this research, column base connections are numerically investigated underbetween the column and base plate, anchorare defined between the interface of base combined axial load and bi-axial bending. Fig. 2rod, nut and washer and grout and concrete,plate-grout, base plate and both the top and schematically represents the FE model and thesincetheyhavemonolithicproperties.bottomwasherandanchorrod-baseplate applied loadings. Tie constraints are providedSurface-to-surfacecontactinteractionswith finite sliding formulation. Two different ONTARIOS SPECIALTY FABRICATION LEADERG & P welding and ironworks G&P Welding is the proudfabricator and erector of the 1872 Seymour Street structural steel & specialty railings North Bay, OntarioP1A 0E2Phone 1-705-472-5454 ONTARIO STEEL DESIGN AWARDS on the Flora Footbridge project on info@gpwelding.com 2019 AWARD OF MERIT BRIDGE the Rideau Canal in Ottawa.www.gpwelding.comADVANTAGE STEEL SUMMER 2020|25'