Modeling steel moment frame and braced
frame buildings in three dimensions using FRAME3D
Summary:
A procedure for the efficient three-dimensional nonlinear
time-history analysis of steel framed buildings is derived.
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 and
strain-hardening in moment frames, and buckling in braced
frames. Floors and roofs of buildings are modeled using
4-node elastic diaphragm elements.
The procedure utilizes
an iteration strategy applied to an implicit time-integration
scheme to solve the nonlinear equations of motion at each
time-step. Geometric nonlinearity is included. The plastic
hinge beam element consists of two nodes at which biaxial
flexural yielding is permitted, leading to the formation
of plastic hinges. Elastic rotational springs are connected
across the plastic hinge locations to model strain-hardening.
Axial yielding is also permitted. A normalized PMM interaction
surface is calculated for one of the model sections, and
used to characterize the axial force-biaxial moment interaction
for all model sections. The panel zone element consists
of two orthogonal panels forming a cruciform section.
Each panel may yield and strain-harden in shear. The elastofiber
beam element is divided
into three segments - two end nonlinear segments and an
interior elastic segment.
Format:
Pages : 9
Size: 698 kb
Author : S. Krishnan
Download:Modeling steel moment frame and braced frame buildings in three dimensions using FRAME3D
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