Overview

In this document, the task of designing a double corbel is completed to illustrate how the CAST Design Tool (Version 0.9.10) can be used for the design of D- (Discontinuity) Regions. Following a brief introduction and description of the CAST graphical user interface, a step-by-step solution is presented. In order to describe many of the important features of this program, complete details are provided with associated images from CAST. The completion of this exercise and thus familiarization with CAST is estimated to take 60 minutes.

Introduction

Figure 1 describes the geometry and loadings for the double corbel structure being considered. The thickness of the corbel is 600 mm. The concrete strength is 35 MPa, and the yield strength of reinforcement is taken as 420 MPa. The corbel supports an ultimate vertical force of 1000 kN and an ultimate horizontal force of 100 kN at each end and two ultimate point loads of 3000 kN in the supporting column region. Bearing plates of 150 mm length x 600 mm width x 25 mm thick are provided at each end of the corbel. Figure 2 shows the selected strut-and-tie model for this structure. The design will be completed to meet ACI 318-02 Appendix A requirements.

Figure 1   The Geometry and the Loadings of the Corbel under Consideration

Figure 2   Strut-and-Tie Model Employed in this Corbel Design

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