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Abstract
The objective of this study is to develop a procedure using SAP2000 to model reinforced concrete flat plate systems and raft foundation based on the results of finite element analysis.
In the current work, the current state-of-practice of reinforced concrete flat plate design including the ACI,ECP direct design and equivalent frame techniques, the yield line method, and the strip design method are reviewed. The principles of these methods along with a critical evaluation of their applicability and limitations will presented as motivation for a finite element based design procedure. Additionally, the current state-of-the-art of flat plate design based on finite element results will be presented, along with various flat plate modeling techniques.
Design methodologies will be studied included the Wood and Armer approach, based on element stress resultants, and the resultant force approach, based on element forces.
A flat plate design procedure based on the element force approach embody in the SECTION CUT command, which will implemented in SAP2000. SECTION CUT command provides the user the ability to design a slab section by specifying a cut definition and several optional integrate the straining actions (moments, shears...). The procedure determines all nodes and elements along the cut, computes the resultant moment acting on the cross-section, which we can use it to design the slab.