Seismic Design Of Braced Frame
Gusset Plate Connections
Author(s)
C. W. Roeder, D. E. Lehman, A. Christopolus, I. Gunnarson,
S. Johnson & J. H. Yoo
Abstract
Steel concentrically braced frames (CBFs) are stiff and strong and are an
economical method to control damage during small, frequent seismic events.
During severe, infrequent earthquakes, CBFs develop inelastic deformation
through axial tensile yielding and post-buckling deformation of the brace. The
inelastic deformation demands of the brace places severe force and deformation
demands on the gusset plate connections. As such, the frame response depends
on the connection response as well. To better understand the frame response of
CBF systems, an analytical and experimental research study into the seismic
performance of CBFs with an emphasis on better understanding the response and
design of gusset plate connections is underway. The research examines the yield
mechanisms and failure modes encountered in the design of gusset plate
connections. To achieve a more balanced design which better distributes
yielding throughout the system, a design procedure that provides economical
design and good seismic performance by balancing the yield mechanisms and
failure modes is proposed. Experimental research to evaluate the proposed
procedures is underway. This experimental program is described, and initial test
results are summarised. Complementary theoretical studies are used to establish
mathematical models to estimate the connection properties and to perform
parametric studies to better understand the influence of the connection on the
frame response.
Keywords: braced frames, buckling, connections, gusset plate connections,
seismic design.
1 Introduction
Concentrically braced frames (CBFs) are commonly used for seismic design,
because their strength and stiffness economically satisfies serviceability design
Keywords
braced frames, buckling, connections, gusset plate connections,
seismic design.
Related Book
Other papers in this volume
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