SEISMIC ANALYSIS OF MULTI-STOREYED BUILDINGS STIFFENED WITH BRACES

Abstract

Many existing reinforced concrete frame buildings located in seismic zones are deficient to withstand moderate
to severe earthquakes. Insufficient lateral resistance along with poor detailing of reinforcement is the main reasons for
inadequate seismic performance of the buildings. Such buildings with no ductile detailing represents considerable
hazard during earthquake. As a result, they suffer severe damage and are responsible for most of the loss of life even for
small magnitude of earthquake. In recent years, a significant amount of research has been devoted to the study of various
strengthening techniques i.e. to increase the lateral stiffness and resistance to enhance the seismic performance of
reinforced concrete multi-storied buildings, however, the attempt by using various arrangements of bracing system in
multi-storied building has not been made.
It is therefore important to develop an effective and economical seismic resistance system so that the buildings can
withstand to moderate or severe earthquake. In the present research study, an attempt has been made to increase the
stiffness of the multi-storied or tall buildings by using bracing system. As a result of this, lateral maximum deflection can
be controlled. To achieve these objectives, an analytical study has been carried out by studying G+10 storey reinforced
concrete building by using versatile and practical analytical tool such as STAAD.pro 2007. A number of different models
incorporating various positions of bracings have been developed. Of the different methodologies, Equivalent Static
Method & Response Spectrum Method of seismic analysis has been adopted with view to understand the accurate
dynamic parameters. The study reveals that, storey drift, as well as element displacements is reduce d considerably and
are well within permissible limits.