International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 04 | Apr -2017
p-ISSN: 2395-0072
www.irjet.net
ANALYSIS OF KNEE BRACED FRAME WITH DIFFERENT BRACING CONFIGURATIONS Arathi Thamarakshan1Arunima S2 1PG 2Asst.
Scholar, Dept. of Civil Engineering, SVNCE Professor, Dept. of Civil Engineering, SVNCE
---------------------------------------------------------------------------------------------------------------------------Abstract - Steel braced frame is one of the structural
consuming so that, the major disasters are avoided.
systems used to resist earthquake loads in structures. Steel
For this, the deficient buildings should be
bracing is economical, easy to erect, occupies less space
identified first and detailed evaluation is to be
and has flexibility to design for meeting the required
carried
strength and stiffness. Bracing can be used as retrofit as
out
to
check
their
strength
and
performances.
well. There are various types of steel bracings are
Structures which are subjected to lateral load
available. In the present study, steel frame with various
must have adequate stiffness and strength which
configurations are analysed by ETABS software. The
helps to controlling the deflection and also prevents
results of time history analysis were then compared with the results of the pushover analysis. The study also
any damage which may occur. Braces are used to
involving
resist lateral forces in a steel structure while the
the
analysis
for
suggesting
the
best
configurations
structures are under seismic excitation. In the case
Keywords: Bracings, knee braced frame, Push over
of knee elements, since the damage is concentrated
analysis, Time history analysis, Steel brace
in a secondary member, it can be easily repaired or replaced at minimum cost. So in this study, different
1. INTRODUCTION
knee elements are used in structures and analyzing hazards,
their resistance against seismic forces. Knee Braced
earthquake is one of the most devastating threats
Frames are the frames in which a non buckling
which has a severe effect on the safety and welfare
diagonal member provides most of the lateral
of human beings. Building which appear to be
stiffness. The flexural or shear yielding of the knee
strong enough found to be crumbling during strong
element provides the ductility under a severe
ground motions. The reasons why the existing
earthquake. In this way, the damage is concentrated
structures are under threat are ignorance of
in a secondary member, which can be easily
building code provisions, wrong construction
repaired or replaced at minimum cost. Moreover
practices and lack of knowledge of earthquake
large seismic impact can be greatly resisted by
resistant design. The demolition of existing
encouraging the ordinary braced frames with
structures and reconstruction as per the code
various bracing configurations.
Among
the
different
natural
description is impractical, uneconomical and time Š 2017, IRJET
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