COMPARATIVE STUDY OF CONCENTRICALLY BRACED FRAME & BUCKLING RESTRAINED BRACED FRAME STEEL SYSTEM TYPE X-TWO STORY
Concentrically braced frame or abbreviated CBF is one kind of structural system that is considerably used for buildings in region prone to earthquake. Braces used in CBF, known as lateral force bearer and structural braced, is functioned as a fuse as the first yield point occured in damaged build...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/53471 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Concentrically braced frame or abbreviated CBF is one kind of structural system
that is considerably used for buildings in region prone to earthquake. Braces used
in CBF, known as lateral force bearer and structural braced, is functioned as a fuse
as the first yield point occured in damaged building due to the design load. One of
the problems that braces could undergo is buckling problem. Buckling
phenomenon, occured when braces bear axial stress, could deteriorate the strength
of the braces element gradually in cyclic load. This buckling problem could be
avoided by using innovation on braces such using buckled-restrained braced. This
kind of braces is restrained laterally by its case so that the probability of braces
failure due to buckling in yielding state could be minimized.
Comparative study is focused on CBF and BRBF with each brace configuration
such as Inverted-V, V, and X-two story. Buckling restrained braced being used is
governed by the result of experiment of speciment 1 which done by California
University in 2006. Method such capacity design, used to govern steel structure
element based on the axial force transfer of braces. The axial force of brace is
governed from structural analysis by software ETABS v.9.7. The structural
system is evaluated in static and dynamic evaluation by NSPA (Nonlinear Static
Pushover Analysis) and NTHA (Nonlinear Time History Analysis). Evaluation is
focused on the behavior and the performance level of the structure, plastic hinges
mechanism, and the relation between base shear and roof displacement in inelastic
condition.
The evaluation result shows that BRBF system has a better structural performance
than CBF system in inelastic condition. The X-two story type of brace is the most
preferrable in structural performance compared to two others type of braces in
CBF and BRBF. |
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