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This investigation includes the determination of the elastic critical summation of loading of different varieties of portal and box frames resting on elastic foundations and subjected to unsymmetrical loading. The critical buckling loads of these frames are obtained for practical values of the stiffness of the elastic springs. In addition, the effect of the stiffness of the elastic foundations on the elastic stability of these frames is thoroughly examined by changing the stiffness of the elastic springs. Different families of curves are obtained to represent the relationship between the critical buckling loads and the parameters affecting it. For unsymmetrical loading P1 & P2, The elastic critical sum of loading is found to be nearly

ANALYSIS OF FRAMES RESTING ON ELASTIC FOUNDATIONS AND SUBJECTED TO UNSYMMYTRICAL LOADS