Vol. 4, No. 7-8, 2009

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ISSN: 1559-3959
Direct damage-controlled design of plane steel moment-resisting frames using static inelastic analysis

George S. Kamaris, George D. Hatzigeorgiou and Dimitri E. Beskos

Vol. 4 (2009), No. 7-8, 1375–1393
Abstract
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A new direct damage-controlled design method for plane steel frames under static loading is presented. Seismic loading can be handled statically in the framework of a push-over analysis. This method, in contrast to existing steel design methods, is capable of directly controlling damage, both local and global, by incorporating continuum damage mechanics for ductile materials in the analysis. The design process is accomplished with the aid of a two-dimensional finite element program, which takes into account material and geometric nonlinearities by using a nonlinear stress-strain relation through the beam-column fiber modeling and including P-δ and P-Δ effects, respectively. Simple expressions relating damage to the plastic hinge rotation of member sections and the interstorey drift ratio for three performance limit states are derived by conducting extensive parametric studies involving plane steel moment-resisting frames under static loading. Thus, a quantitative damage scale for design purposes is established. Using the proposed design method one can either determine damage for a given structure and loading, or dimension a structure for a target damage and given loading, or determine the maximum loading for a given structure and a target damage level. Several numerical examples serve to illustrate the proposed design method and demonstrate its advantages in practical applications.

Keywords
continuum damage mechanics, damage control, steel structures, design methods, beam-column, finite element method, second order effects, elastoplastic behavior
Milestones
Received: 8 December 2008
Accepted: 13 March 2009
Published: 26 December 2009
Authors
George S. Kamaris
Department of Civil Engineering
University of Patras
26500 Patras
Greece
George D. Hatzigeorgiou
Department of Environmental Engineering
Democritus University of Thrace
67100 Xanthi
Greece
Dimitri E. Beskos
Department of Civil Engineering
University of Patras
26500 Patras
Greece