Effect of Rooftop Mounted Telecommunication Tower on Design of the Building Structure

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 04 Issue: 11 | Nov -2017 www.irjet.net p-ISSN: 2395-0072
© 2017, IRJET | Impact Factor value: 6.171 | ISO 9001:2008 Certified Journal | Page 10
EFFECT OF ROOFTOP MOUNTED TELECOMMUNICATION TOWER ON
DESIGN OF THE BUILDING STRUCTURE
Faria Aseem1, Abdul Quadir2
1Assistant professor at Lords Institute of Engineering and Technology Hyderabad, India
2Senior Structural Engineer Hyderabad, India
-----------------------------------------------------------------***--------------------------------------------------------------
Abstract: The increase in demand of telecommunication
towers caused due to technological advances with the
compulsion to provide efficient communication. Consequently,
telecommunication sector in the country has expanded
rapidly. In today’s era the mobile sector is growing
dynamically and trend of mobile communication is
increasing day by day.
Generally for telecommunication purpose, the four legged
supporting tower are used widely. Nowadays mostly the
telecommunication towers as we see are mounted on
rooftops of structures like commercial buildings, hotels and
etc.
In this paper we have presented the results of design of (G+3)
commercial building of plot area 144 sq.m with
telecommunication tower mounted on its rooftop. Tower is of
height 12m and the loads which are considered are dead load,
live load and wind load.
The concrete design was carried out by IS 456-2000, SP-16 &
the steel design was carried out by IS 800-2007 by using
STAAD PRO software. The design with chosen structural
sections found to be safe and the structure withstand all the
above mentioned design loads.
Keywords CommerciaL Building, Telecommunication
tower, STAAD PRO.
I. INTRODUCTION
Radio masts and towers are, typically, tall structures
designed to support antennas (also known as aerials) for
telecommunications and broadcasting, including television.
There are two main types: guyed and self-supporting
structures. They are among the tallest man-made
structures. Masts are often named after the broadcasting
organizations that originally built them or currently use
them. In the case of a mast they are called radiator or
radiating tower, the whole mast or tower is itself the
transmitting antenna. They are also known as
Telecommunication towers.
A commercial building is a building that is used for
commercial purpose. Types can include office buildings,
warehouses, or retail (i.e. convenience stores, big box stores,
shopping malls, etc.). In urban locations, a commercial
building often combines functions, such as an office on
levels 2-10, with retail on floor 1. When space allocated to
multiple functions is significant, these buildings can be
called multi-use. Local authorities commonly maintain
strict regulations on commercial zoning, and have the
authority to designate any zoned area as such. A business
must be located in a commercial area or area zoned at least
partially for commerce.
People are structurally illiterate and want to install the
telecommunication tower on the existing buildings for the
sake of additional earning without caring for public safety.
Such installed tower are the potential hazards for the public
and may cause fatal accidents.
This study is aim to find out if the forces in
telecommunication tower design to be installed at ground
level is similar to the tower design with building model.
Also to find out if the load on building structure is nominal
and can withstand the by the building elements easily or
not.
II. LITERATURE REVIEW
Amiri and Boostan (2000) studied the dynamic response of
antenna-supporting structures. In this regard, self-
supporting steel telecommunication towers with different
heights were evaluated considering the wind and
earthquake loads. A comparison is made between the
results of wind and earthquake loading. These comparisons
resulted in the necessity of considering earthquake loads in
tower analysis and design.
Nitin Bhosale (2012) has carried out the seismic response
of 4 legged telecommunication towers under the effect of
design spectrum from the Indian code of practice for zone –
IV. The axial forces of the tower member were considered
and comparison between roof top mounted tower and
tower supported at ground had been performed to find out
the difference.
Richa Bhatt (2013) carried out study on the influence of
modelling in lattice mobile towers under wind loading
wherein the towers are analyzed for gust factor wind.
Displacements, Member forces and maximum stress have
been compared to find out the effect on towers.

III. PLAN AND SPECIFICATIONS
A. Building specifications
Type of building Commercial Building
Height of the building 12m
Number of stories Four (G+3)
Floor-to-Floor height 3m
Materials M25 for beams
M30 for columns
Fe-415 for steel
Column size 450mm × 360mm
Beam size 360mm × 300mm
Depth of Slab 150mm
B. Tower specifications
Height of tower 12m
Location Centrally located on rooftop
Beams I-section
C. Commercial building with tower
Fig 1. Existing structure
IV. RESULTS AND DISCUSSIONS
Modelling
Fig 2. Assigning beam property
Fig 3. Assigning beam and column properties
Fig 4. Rendering view of beams and columns
Fig 5. Assigning tower property
Fig 6. 3D rendering of whole structure

Fig 7. Assigned plates for slab
The bay frame building structure was modelled, Steel
tower was modeled centrally upon it. The bay frame
selected is of G+3, each storey of height 3 metres. The tower
is of height 12m.
V. RCC DESIGNING
Fig 8. Main steel summary of member 1
Fig 9. Member 1 continued
Fig 10. Member 1 continued

Fig 11. Main reinforcing bars of member 1
Fig 12. Scheduled bars of member 1
RCC Column Design
Fig 13.Column main reinforcement
Fig 14.Column Main reinforcement continued
Fig 15. Column main reinforcement continued
Fig 16. Column Schedule bars of member 41

VI. STEEL TOWER MEMBER DESIGN
Fig 17. Sample member Steel design track of member 262
of tower
Fig 18. Sample member Check of member 262
VII. CONCLUSIONS
It is been observed that the loads on RCC structure are not
nominal and cannot be withstand by the existing member
and need proper design check of the RCC structural
member before installation of telecommunication tower on
the existing structure.
Considering the importance of the additional external loads
due to telecommunication tower on a building structure, it
is been concluded that the design of the columns get
effected tremendously hence the telecommunication tower
should not be installed on the building which are not
designed for such loads.
Further, rooftop towers cannot be based on analytical
results obtained for a similar configuration situated at
ground level, since the member forces in the tower
mounted on rooftop are more than the member forces of
tower installed at ground level.
If ever it is been decided to install the telecommunication
tower on the existing building, it is essential to check the
design of building model with communication tower before
installation otherwise structural failure may cause fatality
to the victims as the structure is quit heavy and may cause
the fatal injury.
REFERENCES
[1] Rajasekharan, J. & Vijaya, S. (2014) Analysis of
Telecommunication Tower Subjected to Seismic &
Wind loading. International Journal of Advancement in
Engineering Technology, Management and applied
science.
[2] Amiri, G. & Boostan, A. (2002) Dynamic Response of
Antenna-Supporting Structures. 4th Structural
Specialty Conference of the Canadian Society for Civil
Engineering. p.1-9.
[3] Nitin Bhosale, Prabhat Kumar and Pandey.A.D (2012):
“Influence of Host Structure Characteristics on
Response of Rooftop Telecommunication Towers”,
International Journal of Civil and Structural
Engineering Volume 2, No 3, February 2012, ISSN
0976 – 4399.
[4] Da Silva, J.G.S., Da S. Vellasco, P.C.G., De Andrade, S.A.L.
& De Oliveir, M.I.R. (2005). Structural assessment of
current steel design models for transmission and
telecommunication towers. Journal of Constructional
Steel Research.
[5] Richa Bhatt, A.D.Pandey and Vipul Prakash (2013):
“Influence of Modeling in the Response of Steel Lattice
Mobile Tower under Wind Loading”, International
Journal of Scientific Engineering and Technology,
Volume 2 Issue 3, April 2013, ISSN: 2277-1581.

[6] IS 800:1984, Indian Standard Code of Practice for
General Construction in Steel, Bureau of Indian
Standards, New Delhi.
[7] IS: 802 (part1/sec1): 1995, Indian Code of Practice for
Use of Structural Steel in Overhead Transmission Line
Towers, Part 1: Materials, Loads and Permissible
Stresses. Bureau of Indian Standards, New Delhi.

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