Abstract:

In this study, the change of the fix end moments in the structural systems with elastoplastic material was investigated for beyond elastic behavior. Accordingly, the fix end moments of an element during the hinging have been calculated. During the load increase, beyond elastic behavior occur in the sections of the elements forming the structural system. This should be taken into account in the Structural Analysis of the system. SOMEP and SOEP analysis program, which is a doctoral study, was used to compute this state. In this study, an analysis method was developed to compute the fix end moments by obtaining section plasticization ratio which takes into account the beyond elastic states of the sections. This method was added to the SOMEP analysis program. Section plasticization ratio is a concept that gives the plasticization rate of the section which is the beyond elastic condition. In the analysis, the relations of indicating the change of fix end moments were revealed. The results obtained were presented in graph and charts. The material used was considered as the ideal elastoplastic material. In the study, nonlinear structural analysis of plane frames was performed by second order elasto-plastic analysis. In the examination of nonlinear analysis, in terms of materials and geometry, it was assumed that the plastic sections are accepted as a plastic hinge.