Corbel at column


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Title: Corbel at column

Author(s): Tjen N. Tjhin and Daniel A. Kuchma

Publication: Special Publication

Volume: 208


Appears on pages(s): 105-116


Date: 10/29/2002

A single corbel projecting from a 14 in. (356 mm) square column is designed using the strut-and-tie method according to ACI 318-02 Appendix A. The corbel is to support a precast beam reaction force, Vu of 56.2 kips (250 kN) acting at 4 in,(102 mm) from the face of the column. A horizontal tensile force, Nuc of 11.2 kips (49.8 kN) is assumed to develop at the corbel top, accounting for creep and shrinkage deformations. The structure and the loads are described in Fig. (3.1-1). Normal-weight concrete with a specified compressive strength, fc of 5 ksi (34.5 MPa) is assumed. The yield strength of reinforcement, fy is taken as 60 ksi (414 MPa). The selected corbel dimensions including its bearing plate are shown in Fig. (3.1-2). The corresponding shear span to depth ratio, a/d, is 0.24. A simple strut-and-tie model shown in Fig. (3.1-3) is selected to satisfy the code requirements. The main tie reinforcement provided is 5 #4 (#13 mm) bars. These bars are welded to a structural steel angle of 31/2 in. x 31/2 in. x 1/2 in. (89 mm x 89 mm x 13 mm). The reinforcement details are shown in Fig. (3.1-5).