Interactive Computer Analysis Methods for Predicting the Inelastic Cyclic Behaviour of Structural Sections

摘要

An interactive analysis program suited for micro-computers has been developed to analyze structural steel, reinforced concrete, and prestressed concrete sections subjected to axial load and uniaxial bending moments. The program currently includes bilinear, cubic, and Ramberg-Osgood steel models and a concrete model that can mimic ones suggested by other researchers. Additional material models are relatively easy to implement. The report discusses the theoretical background for the program, the solution strategies used and their limitations, and the types of analyses for which the program is suited. Using various options in the program conventional moment-curvature and axial load-moment interaction curves can be conveniently developed. In addition, complicated loading histories such as non-proportional application of axial load and moment including unloading and reversal may be considered. The program is interactive in nature permitting the user to rapidly redo a particular load increment, a complete load excursion starting from specified initial conditions, or to impose additional loading on the current state of the section. Input of section geometry and materials is also interactive and a user can modify parameters related to these items and reanalyze the section during the same or subsequent analysis sessions.