Journal of Transportation Systems

Comparative Study of Seismic Response of RC Frame Soft-Storey Buildings

Mr. Neeraj Mehta — 2016-07-01

The use of brick masonry as infill walls in reinforced concrete (RC) framed buildings is
inevitable even in highly earthquake prone areas. Due to increase in demands for
architectural features in the framed buildings, the provision of soft storey is a common
practice in many multi storeyed structures throughout the world, for parking. In the past
earthquakes, surveys of buildings failed show that these types of structures are found to be
the most vulnerable. After the Bhuj earthquake in 2001, the revision of code IS:1893 was
done in 2002, introducing certain new design recommendations especially for stilt framed
buildings. As per the clause 7.10.3(a) of the same code: “The columns and beams of the softstorey
are to be designed for the multiplication factor of 2.5 times the storey shears and
moments calculated under seismic loads of bare frame”. The given multiplication factor
(MF) of 2.5, applicable for all the stilt framed buildings, is proved to be quite high and
suggests that all existing stilt framed buildings (whose design was based on the earlier
codes) are considered to be highly vulnerable under seismic loading. However, this value of
MF does not account for the types and numbers of infill walls, number of bays and storeys,
etc. The present study is an attempt to study the variation in different structural properties
such as lateral strength, stiffness, ductility, etc., for the considered frame when designed for
zone III and redesigned as per the clause 7.10.3(a) of IS:1893-2002.

Structural Economics and Dynamic Effect of Multistory Building

Susanta Banerjee — 2016-06-08

Buildings are constructed to meet serviceability requirement. It is important to construct
buildings with proper analysis and design, so that it serves for its design life without showing
any failure. This paper presents the response of the buildings by taking the effect of seismic
and wind load and among them the governing load for each example buildings to carry out
design and detailing, is studied. Response parameters i.e. storey displacement, storey drift,
time period, storey shear are also calculated. Concrete and steel required for beam and
column are obtained to evaluate structural cost of each example buildings.

Minimizing the Effects of Lateral Loads on Multistorey Structure by Optimum Positioning of Shear Walls

Abhyuday Titiksh — 2016-08-11

Shear wall systems are one of the most feasible and hence commonly used lateral loads
resisting mechanism employed in high rise buildings. They have high plane stiffness and
strength which can be utilized to simultaneously resist large horizontal loads and support
gravity loads. Incorporation of shear walls has now become inevitable in multi-storey
buildings so as to resist the lateral forces such as Seismic loads and Wind loads. Hence, it is
very necessary to determine the most effective location of shear walls. Shear wall
arrangement must be absolutely accurate, because if not, it will cause negative effect instead.
When the mass center and hardness center coincide with each other, the distance of shear
wall from the mass center also plays an important role in the shear contribution of the shear
wall. In this project, a study has been carried out to determine the optimum structural
configuration of a multistory building by changing the shear wall locations radically. Four
different cases of shear wall position for G+10 storey building with keeping zero eccentricity
between mass center and hardness center have been analyzed and designed as a frame
system by computer application software ETABS. The framed structure is subjected to lateral
and gravity loading in accordance with IS provision and the results are analyzed to
determine the optimum positioning of the shear wall.

A Case Study of Retrofitting of Structure

D. G. Pardeshi — 2016-07-13

It is not possible to demolish all the building and build new with earthquake resistant
features as demolition and rebuilding is not feasible due to economic, social, psychological
and cultural reasons. So, the action required is to improve their behavior
by retrofitting/strengthening/rebuilding/restoring/repairing/remolding. The purpose of doing
case study is to share the knowledge from particular that is out of usual in one way or
another. One of the purposes could be to share hardcore technical information with the
technocrats. We set out to study what the retrofitting of building are by searching for
further information in different case study.

Investigation into Behavior of Tall Building Using Belt Truss and Outrigger Systems to Control Deflection

Akshay A. Khanorkar — 2016-05-03

In this paper, the comparative study was carried out to compare the use of belt truss and
outrigger in tall building to control deflection. To this end 40-storey analysis model
structures composed of reinforced concrete core walls with flat slab were prepared. Models
are individually analyzed with outrigger and belt truss. The static wind and earthquake
analysis on building models showed that first and second optimum position of belt truss as
well as outrigger was same and the third position of outrigger and belt truss was different.
Based on the analysis results it was concluded that the belt truss was efficient as that of
outrigger to control deflection in tall building subjected to lateral loads.