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• W4526427 abstract "A procedure for the efficient three-dimensional nonlinear time-history analysis of steel framed buildings isderived. It incorporates three types of nonlinear beam elements - the plastic hinge type, the elastofiber type,and the 5-segment modified elastofiber type – and nonlinear panel zone elements to model yielding andstrain-hardening in moment frames, and buckling in braced frames. Floors and roofs of buildings are modeledusing 4-node elastic diaphragm elements. The procedure utilizes an iteration strategy applied to an implicittime-integration scheme to solve the nonlinear equations of motion at each time-step. Geometric nonlinearityis included. The plastic hinge beam element consists of two nodes at which biaxial flexural yielding ispermitted, leading to the formation of plastic hinges. Elastic rotational springs are connected across the plastichinge locations to model strain-hardening. Axial yielding is also permitted. A normalized PMM interactionsurface is calculated for one of the model sections, and used to characterize the axial force-biaxial momentinteraction for all model sections. The panel zone element consists of two orthogonal panels forming acruciform section. Each panel may yield and strain-harden in shear. The elastofiber beam element is dividedinto three segments - two end nonlinear segments and an interior elastic segment. The cross-sections of theend segments are subdivided into fibers. Associated with each fiber is a nonlinear hysteretic stress-strain lawfor axial stress and strain. This accounts for coupling of nonlinear material behavior between bending aboutthe major and minor axes of the cross-section and axial deformation. While beams and columns inmoment-frames can be modeled using the elastofiber beam element, braces and columns susceptible to bucklingmay be modeled using a modified elastofiber beam element with the elastic segment in the standard elastofiberbeam element subdivided into two elastic segments and a central nonlinear segment. First mode buckling inthe element is simulated through yielding of the central nonlinear segment. All these elements are integratedinto a building analysis program, FRAME3D. The various elements and the program are validated againstanalytical solutions of simple problems, as well as scaled and full-scale tests of beam-column assemblies and4-6 story structures." @default.
• W4526427 created "2016-06-24" @default.
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• W4526427 date "2008-01-01" @default.
• W4526427 modified "2023-09-24" @default.
• W4526427 title "Modeling steel moment frame and braced frame buildings in three dimensions using FRAME3D" @default.
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