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CE of the Organization Sree Dattha Institute

 

CE 1: Working on Optimization of belt truss system and
outrigger to stiffen high rise buildings.

 

a) – Introduction:

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CE 1.1 – Introduction:

 

                This career episode is based on
my engineering activity at Sree Dattha Institute of Engg & Science. In this
project, I worked as a student and worked on Optimization of belt truss system
and outrigger to stiffen high rise buildings.

 

 

                                                             
CHRONOLOGY

Project
Title

Optimization of belt truss system
and outrigger to stiffen high rise buildings

Dates for the Project

December 2011 – March 2012

Duration

3 Months

Name of the
Organization

Sree Dattha Institute of Engg
& Science

Location

Hyderabad, Telangana, India

My Role

Under Graduate, Bachelor of
Technology (Civil Engineering)

 

 

b) Background:

 

CE 1.2 – Nature of the overall engineering project:

 

This
project highlights the use of outrigger and belt truss system and optimization
techniques of tall concrete structures for lateral loads mainly wind, trying to
find the optimum locations and number of outriggers for a specific high-rise
building.

 

 

 

 

 

CE 1.3 – Objective of the project:

 

The
main objective of this project was to find a number
of outriggers and the optimum locations for a specific high-rise building by
using the trigger and belt truss system and optimization techniques of tall
concrete structure for lateral loads mainly wind through response spectrum
method using ETABS software.

 

CE 1.4 – Nature of your particular work area:

 

·        
I used the ETABS software to get the required results.

·        
I studied the use of outrigger and belt truss
placed at different locations subjected to wind or earthquake load.

·        
I carried out linear dynamic analysis method and
compared the results between buildings with and without outriggers.

·        
I had to find out the optimum location of
outrigger and belt truss for reducing lateral displacement.

 

CE 1.5 – Statement of Your
Duties:

 

·        
While working on this project, I discussed complete literature review of
outriggers and belt truss.

·        
I described the history of outriggers, types of
outriggers, behaviour of outriggers, benefits of outriggers and seismic
analysis procedure also on seismic analysis procedure and its drawbacks.

·        
I explained about the modelling developed for the
selected structure using ETABS and the basic data of the structure was
presented in detail along with various load combination.

·        
I modeled a building that involves the modeling and assemblage of its
various load carrying elements. This model ideally represented the complete
three dimensional (3D) characteristics of a building, including its mass
distribution, strength, stiffness, and
deformability.

·        
I made calculations for Material Properties, Beams and columns, Slabs, and Walls. I calculated Live load,
Super Imposed Dead
Loads, Wind Loads, Earthquake Loads, and Loading combinations.

·        
I also made calculations for the three-dimensional
model and Description of Building.

 

 

CE 1.6 – Organizational Chart:

 

Sree Dattha
Institute of Engg & Science

Head of department
(Sri Raghavendra Rao Sir)

Project Supervisor
(Shahid Iqbal Sir)

Team Leader
(Mohsin Khan)

Associate Team Members

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

c) Personal Work Activity:

 

 

CE 1.7 – Technical Details of the
work:

 

 For this project, 8 types of 60 storey three
dimensional models of outrigger and belt truss system were subjected to wind
and earthquake load are analysed and compared to find the lateral displacement
reduction related to outrigger and belt system location. The analysis engine
used for the analysis and design is E-TABS software.

 

A total of 9 different
arrangements of outriggers analysed using ETABS software were:

 

·        
Structural Model without outrigger.

·        
Structural Model with one outrigger at the top
floor.

·        
Structural model with one outrigger at top floor
and another at 3/4th height of the building i.e on 45th
storey.

·        
Structural model with one outrigger at top floor
and another at mid height of the building i.e on 30th storey.

·        
Structural model with one outrigger at top floor
and another at 1/4th height of the building i.e on 15th
storey.

·        
Structural Model with one outrigger at the top
floor with belt truss.

·        
Structural model with one outrigger at top floor
and another at 3/4th height of the building i.e on 45th
storey with belt truss.

·        
Structural model with one outrigger at top floor
and another at mid height of the building i.e on 30th storey with
belt truss.

·        
Structural model with one outrigger at top floor
and another at 1/4th height of the building i.e on 15th
storey with belt truss.

Description of building:

 

The model considered for this study is a 209.5m high
rise reinforced concrete building frame. The building represents a 60 storied
office building.

The plan area of the structure is 30.40 m x 37.00 m
with columns spacing differs along X-direction
at (6.7m, 6m and 5m) and spaced at 7.4m center to center along Y-direction. The height of each storey
is 3.50m and all floors are considered as typical floors.

 

 

CE 1.8 – How you applied your
engineering knowledge and skills:

 

During our engineering period we studied about the
axial load, the formula for axial load was:

 

P = A*E*d

                        2L

 

Where,

 

P = axial load in the
columns

A
= Area of the columns

E
– modulus of Elasticity

d = distance between the exterior columns

L = height of the building

 

The same formula i took it as a reference and applied
in this process which was a great help to me in achieving my solution.

 

CE 1.9 – The tasks delegated to
you and how did you accomplish:

 

Each member took responsibility of separate activities
and i took the major task of studying and understanding the concept of response
spectrum method in order to use it in our project. After studying in detail i
found out few technical things about the response spectrum method such as:

 

·        
A response spectrum is a plot of the maximum
response amplitude (Displacement, velocity and acceleration) versus time period
of many linear single degree of freedom oscillators to give component of ground
motion.

·        
It is one of the useful tools of earthquake
engineering for analysing the performance of structures specially in
earthquakes.

·        
The natural frequency of the structure and the
peak response of the building can be estimated by reading the value from the
ground response system.

 As
we had the duration of only 3 months to complete the project we needed atleast
15 days to finish the complete study of this process in order to start the
execution work and i thankfully i finished analysing the task given to me
within the given time which helped us in the overall duration of the project.

 

CE 1.10 – Any particular
technical difficulties/problems and how you solved them:

 

 

 

 

CE 1.11- Strategies
devised by you including any original or creative design work:

 

The outrigger concept is in widespread use today in
the design of high rise buildings. This concept “outrigger” trusses or girders
extend from a lateral-load resisting core to columns at the exterior of
building. This core may consist of either shear walls or braced frames. I
discussed with my team members and suggested them that we will go for braced frames
instead of shear walls as the outcome of the result would be more accurate and
the lateral displacement was minimal compared to shear walls.

 

 

CE 1.12 – How you worked with
other team members:

 

During this project, I had the opportunity to
lead a team. I elevated the morale of our team and motivated the team members
to complete work on time and added advantage of working with my team members
was every individual was technically strong enough and during our daily
meetings we used to discuss all the technical issues and used to share all the
knowledge we gained during our engineering course and during this project,
which helped us in preparing this project with good results and we were able to
submit the project before the dead line.

 

 

d) Summary:

 

CE 1.13 – Your view of the
overall projects:

 

This
project highlighted the use of belt truss system and outrigger and optimization
techniques of tall concrete structure for lateral loads mainly wind, trying to
find number of outriggers and the optimum locations for a specific high-rise
building. The literature pertaining to response spectrum method and analysis of
buildings with the optimized use of
outrigger and belt truss system was reviewed. To carry out this study, a linear
dynamic analysis procedure known as response spectrum method has been used. For
this purpose, eight types of 60-storey three-dimensional
models of belt truss system and outrigger are subjected to earthquake and wind
load is compared and analyzed to find the
lateral displacement reduction related to the belt system location and
outrigger. The analysis engine used for the analysis and design is ETABS
software. After carrying out response spectrum method for this model, it is
observed that maximum lateral displacement of 19.43% is achieved by providing
the first outrigger at the top and second
outrigger at the (one-fourth) of the structure height. The difference in
behavior of outrigger with belt truss was proven to be more effective when compared to the outrigger without belt truss.
The use of belt truss system and outrigger in high-rise buildings makes the
structural framing efficient and increase the stiffness under lateral loads.

 

 

 

 

CE 1.14 – How the project fared
in meeting the goals/requirements:

 

As the deadline for submitting the project was
coming near we gave our complete time and dedication and completed the project
before the deadline.

 

CE 1.15 – How your personal role
contributed to the project:

 

Being a team leader was a great honour for me as I had a chance to lead
a team of engineers who were technically strong and at the same time I had to
prove the trust which my Head of department had showed in me. I planned a
schedule for all the members i.e the working time, the studying time and for
all other activities based on the duration of the project which had to be
followed by everyone including me as well. I guided my team members in solving
the issues which they faced as I had studied the complete resonse spectrum
method in detail. My leadership skills were also flourished. Moreover, I
created presentations and communicated effectively with the team members in
order to make them understand in detail.

 

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