Computer Analysis of r/c Columns in Biaxial Bending


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Title: Computer Analysis of r/c Columns in Biaxial Bending

Author(s): C. A. Zeris and S. A. Mahin

Publication: Special Publication

Volume: 111


Appears on pages(s): 43-72

Keywords: axial loads; biaxial loads; columns (supports); ductility; computer programs; dynamic structural analysis; earthquakes; hysteresis; earthquake-resistant structures; earthquakes; mathematical models; microcomputers; reinforced concrete; structural analysis

Date: 12/1/1988

With the rapid advancement of powerful and relatively low-cost minicomputers, refined analytical techniques are now possible to apply during the design stage. An interactive program is presented herein for such refined analysis of beam-column sections under generalized biaxial bending and axial load. The program has a wide range of analysis options for the estimation of complex hysteretic response and three-dimensional interaction diagrams. In addition, it is equipped with a portable window manager, mouse driven input, and editing options and color graphics for on-line inspection of input and analysis results. Different types of materials can be specified such that reinforced, prestressed concrete or plain/composite steel sections can be considered. The section model is idealized as an assembly of fibers acting under a uniaxial state of stress. The section model theory is extended to represent entire members for the nonlinear finite element analysis of complete buildings.