Asad Esmaeily - Assistant Professor of Structural Engineering, Civil Engineering
Robert J.Peterman - Associate Professor of Structural Engineering, Civil Engineering

A computer program was developed to analyze the non-linear cyclic performance of reinforced concrete structural member under carious types pf loading paths including non-sequential variations in axial load. This performance is significantly affected by the loading history. Different monotonic material models as well as hysteresis rules for confined and unconfined concrete and steel, some developed and calibrated against material test results, were implemented in a fiber – based moment- curvature and in turn force-deflection analysis . One of the assumptions on curvature distribution along the member was on a method developed to address the variation of the plastic hinge length as a result of loading pattern. Functionality of the program was verified by reproduction of analytical results obtained by others; and accuracy of the analytical process and models, were tested against the experimental results. While the program can be used to predict the response of a member under a certain loading pattern, it can also be used to examine carious analytical models and methods or refine a custom material model against test data.

analysis , force-deflection , load pattern , material model , moment - curvature , performance , variable axial load