Transcription of 35 PLASTIC ANALYSIS
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35 PLASTIC ANALYSIS
PLASTIC ANALYSIS Version II 35 - 1 PLASTIC ANALYSIS INTRODUCTION The elastic design method, also termed as allowable stress method (or Working stress method), is a conventional method of design based on the elastic properties of steel. This method of design limits the structural usefulness of the material upto a certain allowable stress, which is well below the elastic limit. The stresses due to working loads do not exceed the specified allowable stresses, which are obtained by applying an adequate factor of safety to the yield stress of steel. The elastic design does not take into account the strength of the material beyond the elastic stress. Therefore the structure designed according to this method will be heavier than that designed by PLASTIC methods, but in many cases, elastic design will also require less stability bracing. In the method of PLASTIC design of a structure, the ultimate load rather than the yield stress is regarded as the design criterion.
(iii) The material is homogeneous and isotropic in both the elastic and plastic states. (iv) The plane transverse sections (the sections perpendicular to the longitudinal axis of the beam) remain plane and normal to the longitudinal axis after bending, the effect of shear being neglected. (v) There is no resultant axial force on the beam.
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