Drake is Principal Structural Engineer, Fluor Daniel, Irvine, CA. X ⳱ base plate tension interface cantilever parallel to moment direction, in. N ⳱ base plate bearing interface cantilever perpendicular to moment direction, in. m ⳱ base plate bearing interface cantilever direction parallel to moment direction, in. f ⳱ anchor rod distance from column and base plate centerline parallel to moment direction, in. N ⳱ base plate length parallel to moment direction, in. Where: B ⳱ base plate width perpendicular to moment direction, in. A typical beam-column base plate geometry is shown in Figure 1, which is consistent with that shown on page 11-61 of the LRFD Manual.4 Typically, these beam-column base plates have been designed and/or analyzed by using service loads1 or by approximating the stress relationship assuming the compression bearing location.2 The authors present another approach, using factored loads directly in a method consistent with the equations of static equilibrium and the LRFD Specification.3 The moment-resisting base plate must have design strengths in excess of the required strengths, flexural (Mu ), axial ( Pu ), and shear (V u ) for all load combinations. Therefore the base plate and anchor rods must be capable of transferring shear loads, axial loads, and bending moments to the supporting foundation. ![]() INTRODUCTION It is common design practice to design a building or structure beam-column with a moment-resisting or fixed base. Beam-Column Base Plate Design- LRFD Method RICHARD M.
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