Evaluation Of Approximate Methods For The Design Of Biaxiall Y Loaded Reinforced Concrete Columns

The ultimate capacity of reinforced concrete sections under normal force and biaxialrnbending moments can be represented by a three dimensional interaction surface in terms ofrnthe normal force and biaxial moments. The surface can be conveniently represented by arnfamily of curves either on a plane of constant normal force relating the two momentrncomponents or as interaction diagram on a plane of constant angle relating the normalrnforce and the resultant of the two moment components. However, the curves can not berndescribed by exact and closed form mathematical expressions due to a wide variety ofrnparameters involved in the determination of ultimate biaxial moment capacity of crosssectionsrnwith normal force. Thus the systematic generation of such curves to be used forrndesign involves obtaining sufficient number of suitable points by iteration which normallyrnrequires use of computer programs. In the absence of such facilities, the use ofrnapproximate methods becomes mandatory. There are different approximate methodsrnadopted in different codes for the design of biaxially loaded reinforced concrete columnsrnand the purpose of this thesis work is to assess and evaluate the proximity of some of thesernapproximate methods with the exact solution. The approximate methods evaluated includernthose recommended by EBCS-2 [1), CPllO [2,3) and ACI [4,5).

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