TL project

COST COMPARISON FOR
TRANSMISSION LINE TOWERS
USING DIFFERENT MEMBER SECTIONS

COST COMPARISON FOR TRANSMISSION LINE TOWERS USING
DIFFERENT MEMBER SECTIONS
 Project start-up and initial presentation
 Consideration of various standards and specifications
 AutoCAD drafting
 Loading calculations
 Structural analysis in STAAD-Pro v8i
 Design of transmission line tower
 Project completion documentation

DIFFERENT MEMBER SECTIONS – START-UP & INITIAL PRESENTATION
 Reviewed chronological and working procedure for analysis and design of transmission
line towers using angle (L-sections) sections of steel.
 Performed literature review for use of hollow circular sections (HSS) in tower design.
 Prepared chronological procedure for design of transmission line towers.
 Prepared dataset of required standards and specifications for design of tower using angular
and hollow circular section.
 Initial presentation on topic proposal was given to project committee.

DIFFERENT MEMBER SECTIONS – Standards And Speficifactions
 IS – 802 “CODE OF PRACTICE FOR USE OF STRUCTURAL STEEL IN OVERHEAD
 TRANSMISSION LINE TOWERS”
 IS – 806 “CODE OF PRACTICE FOR USE OF STEEL TUBES IN GENERAL BUILDING
 CONSTRUCTION”
 IS – 5613 “CODE OF PRACTICE FOR DESIGN, INSTALLATION AND MAINTENANCE OF
 OVERHEAD POWER LINES”
 IS – 2062 “CODE OF SPECIFICATIONS FOR HOT ROLLED MEDIUM AND HIGH TENSILE
 STRUCTURAL STEEL”
 IS – 1161 “STEEL TUBES FOR STRUCTURAL PURPOSES – SPECIFICATIONS”
 TRANSMISSION LINE MANUAL by Central Board of Irrigation and Power (CBIP), Govt. Of India.
 ‘BLUE BOOK’ By TATA Steel Inc.
 CIDECT Design Guide 7

DIFFERENT MEMBER SECTIONS – AutoCAD Drafting
 Prepared drawing layout of different parts
of transmission towers to understand their
functions
 Detailing of different parts of transmission
towers
 Followed specification from CBIP manual
to understand specification for calculation
of electric clearance to finalize length of
cantilever tower arm
VUE 2-2
VUE 1-1
VUE 3-3
690075007500TRONCON-IPIEDS
FACE TRANSVRSALE
PIED -2 POUR
COUPE 7-7 COUPE 8-8COUPE 9-9
TRONCON-IITRONCON-IIITRONCON-IVTRONCON-VBASE+12
BASE -8
BASE -4
BASE ±0
-2.0
-1.0
±0.0
+1.0
+2.0
+3.0
BASE +4
BASE +8
BASES -8, -4, ±0
PIED -1 POUR
BASES -8, -4, ±0
PIED ±0 POUR
BASES -8, -4, ±0
PIED +1 POUR
BASES -8, -4, ±0
PIED +2 POUR
BASES -8, -4, ±0
PIED +3 POUR
BASES -8, -4, ±0
PIED +3 POUR
BASES +4, +8, +12
PIED +2 POUR
BASES +4, +8, +12
PIED +1 POUR
BASES +4, +8, +12
PIED -1 POUR
BASES +4, +8, +12
PIED ±0 POUR
BASES +4, +8, +12
FACE LONGITUDINALE
-2.0
-1.0
±0.0
+1.0
+2.0
+3.0

DIFFERENT MEMBER SECTIONS – Loading Calculation (Load Cases)
 Finalized possible load cases to perform
analysis of transmission towers
 Followed criteria from IS – 5613 and IS –
802 in finalizing maximum possible load
cases
 Considered three basic criteria such as
reliability, security and safety
 Considered different loading conditions
such as broken wire condition, narrow front
wind load condition, temporary loads
during construction etc.

DIFFERENT MEMBER SECTIONS – Loading calculation (SAG-TENSION)
 Performed SAG-TENSION calculation as
per IS - 5613 to obtain maximum Sag of
different type of conductors
 Considered temperature effect in Sag-
Tension calculation for different type of
conductors as per IS-802 and CBIP manual
 Considered material properties to quantify
behavior of conductor
 Considered wind load effect on SAG-
TENSION.

DIFFERENT MEMBER SECTIONS – Loading calculation (Wire load)
 Performed wire load calculation
under different conditions.
 Each load case was considered
separately while calculating wire
load.
 Each of Three criteria ( reliability,
security and safety) was considered
in wire load calculation
 Load calculation was performed for
both conductor and earth wire.

DIFFERENT MEMBER SECTIONS – Loading calculation (wind load on members)
 Calculated total wind load on each of
the tower truss members.
 Exposed area of each member was
considered in wind load calculations.
 Quantified total wind load on each of
the two faces of tower ( Longitudinal
and transverse face)

DIFFERENT MEMBER SECTIONS – Structural Analysis
 3D model of tower was generated in STAAD-Pro
 Initial member sections were used and analysis
was performed
 Necessary iterations were performed to calibrate
design calculations.
 Process of analysis and design with required
iterations was followed using Angle (L-sections)
and Hollow circular steel (HCS) sections.

DIFFERENT MEMBER SECTIONS – Structural Analysis
 Member forces in
STAAD-Pro model

DIFFERENT MEMBER SECTIONS – Structural Analysis (3D rendering of model)
 Rendering of 3D model of tower in
STAAD-Pro.
 Members were aligned with respect
to global axis using beta angle
function in STAAD-Pro.

DIFFERENT MEMBER SECTIONS – Design of Transmission Line Towers
 Excel sheets were generated
to perform design
calculations for each
members in the tower.
 Stresses in each member
were obtained from
STAAD-Pro analysis for
design of member section.
 Each design was calibrated
by iterating analysis and
design process.

DIFFERENT MEMBER SECTIONS – Design of Transmission Line Towers
 Total weight of finalized sections
was performed using both sections
for the same tower.
 Cost analysis for use of each member
section in tower was performed.
 Cost comparison was performed at
last to find more economic solution.

DIFFERENT MEMBER SECTIONS – Project completion documentation
 Final document of project report was submitted to Kalpataru Power Transmission Limited
(KPTL)
 Project based thesis report was submitted to department of Civil Engineering at
Gandhinagar Institute of Technology, Gujarat Technological University (GTU),
Gandhinagar, Gujarat, India
 Project was presented at Gujarat State Technical Project Fair and was awarded position of
2nd runner up.

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