Microwave Tower Presentation.ppt

Microwave tower design

1. ADVANCED DESIGN OF STEEL STRUCTURE
PA-03–RuturajS.Jadhav(S1032220018)
PA-07-DarshanS.Choudhari(S1032220187)
PA-32-ShaileshChoudhary(S1032212007)
Faculty-Dr.NutanPathak
Date-18-11-2022
MIT WORLD PEACE UNIVERSITY, PUNE
A
PRESENTATION UNDER THE SUBJECT
MICROWAVE TOWER

2. CONTENTS
1.Introduction
2.Types
3.Components
4.Types of loads
5.Structural Configuration

3. •A Tower is tall skeleton structure with relatively small cross-section, which has a
large ratio between height and maximum width. It is freely standing self
supporting structure fixed to the base or foundation
•Microwave transmission towers also called as signal transmission tower or a
signal tower. The main function is to support the signal, support the signal
transmitting antenna, and is used for mobile communications,
telecommunications, telecommunication, and GPS communications department.
TOWER

4. Microwave Tower
•A Microwave transmission is a
transmission of information by
microwave radio waves.
•The tower used for this
communication to information is
Microwave Transmission Lattice
Tower.
•These microwave transmissions are
mainly used for point-to-point
communications, in Satellite
communications, and in deep space
radio communications.

5. TYPES OF MICROWAVE TOWER -
1.BASEDONCROSSSECTIONALAREA.
2.BASEDONSTRUCTURALACTION.
3.BASEDONDIFFERENTTYPESOFMATERIALUSED.
4.BASEDONPLACEMENTOFTOWER.
5.BASEDONNUMBEROFSEGMENTSUSED.
6.BASEDONDIFFERENTTYPESOFBRACINGUSED.

6. 6
Types of tower
Tower with vertical load
Over head tank
Oil tank
Weather radar tower
Tower with horizontal
load
Self supporting tower
Lattice tower
Tubular tower
Guyed tower

7. BASED ON CROSS SECTIONAL AREA -
1.SQUARE
2.RECTANGULAR
3.TRIANGULAR -THESE TYPE OF TOWER MOSTLY
USED TO TRANSMIT RADIO SIGNALS.
4.HEXAGONAL
5.POLYGONAL
Thesetypesoftowersareusedwhereveryhighwind
pressureispresent&tornadoaffectedareas.Duetothat
structuregetsmorestability.
Thesetypesoftowerareusedwheremoderatewindpressure
ispresentandamplespaceforinstallationispresent.

8. SELF SUPPORTNG TOWER –
(Lattice Tower)
1.Baseisof7%to10%ofheightoftower.
2.TowerSupportitsweightbyitsownself
support.
3.Thiscanbeplacedeitheronterraceorthe
groundsurface.
4.Thistoweruselessarea.Whenthearea
availabilityislessthenthistoweris
mostlyused.
5.Thistowercansustainhighwindload&
selfweightbecauseofitsselfsupporting
property.
BASED ON STRUCTURAL ACTION -

9. GUYEDTOWER(MASTS)-
1.Thistowerismosteconomical.(steel
sectionusedforconstructionisless)
2.Additionalsupportisrequiredfor
stability&itisgivenbytheropes/cable.
Extraloadofwindloadiscarriedbythis
cables.Thiscableshavinghightension
capacity.
3.GuyedTowerarenormallyguyedin
threedirectionoveranradiustypically
2/3ofheightoftower&havetriangular
latticesectionforcentralmast.
4.Largeopenspaceisrequiredforthe
installationgenerallyprovidewhere
largeareaisavailable.

10. MONOPOLE TOWER -
1.Thesetypeoftowerhaveless
height.
2.ItisSupportedbysinglecolumn.
3.Deadloadattopisless.
4.Heightoftowerismostlyless.Itis9
meterorlessthanthat.
5.Whenno.ofAntennarequirements
islessthistypeoftowermainly
used.
6.Baserequirementforinstallationis
less.

11. 1.ANGULAR SECTION TOWER:
•This section sustains high wind (also called as lattice tower) load.
•Mostly used in India & act as cantilever Truss.
•Economical in construction.
2.HYBRID TOWER:
•In this tubular section is used & also combination of tubular and angle section
is used.
•This are used for higher wind load.
•This material section required skilled labour for installation.
•It is costly in nature.
BASED ON DIFFERENT MATERIAL SECTION -

12. •Thisismoreeconomical.
•Arearequirementsisless.
•Builtwheretherooftophave
adequatestrength.
•MostlyinUrbanAreas.
•Heightoftowerismostly9-30m.
•Thisislesseconomical.
•Arearequirementsishigh.
•MostlyinRuralarea.
•HeightofTowersisupto30-
200m
BASED ON PLACEMENT OF INSTALLATION -
BASED ON PLACEMENT OF
INSTALLATION
ROOF TOP OPEN SPACE

13. 3 –Slope Tower2 –Slope Tower Single Slope Straight Tower
(1) (2) (3) (4)
BASED ON NO. OF SEGMENTS -

14. (1)SINGLEDIAGONALBRACING–
•ItissimplestformofBracing.Loadissharedby
diagonalmembers.Staticallydeterminatestructure.
•Itisusedintowerhavingheightupto30m.
(2) DOUBLE DIAGONAL BRACING (X -X Type) -
•DoublediagonalBracingwithouthorizontal
Member.Inthisloadissharedbybothdiagonal
membersofbracing.
•Itisusedintowerhavingheightupto50m
BASED ON DIFFERENT BRACING SYSTEM -

15. (3) K-Bracing-
•Thistypeofbracinghavelargeheadroom
atthebase.Sothateasymovementof
material&Mencanbedone.
•Itisusedintowerhavingheightupto50m
to200m.
(4)X-BBracing:
•Thistypeofbracingusedhavingheightup
to50m.
•Thisismostlyusedtypeofbracing.
Becausetheforceiscarriedbydiagonal
andhorizontalmembers.

16. (5) X-B-X Bracing -
•Thistypeofbracingusedhavingheightup
toheight50–200m.
(6) W Bracing -
•ThistypeofbracingconsistofOverlapping
Diagonals.
•Itisstaticallyindeterminate&usedupto
height50-200m.

17. (7)SubdividedV-Bracing-
•Commonlyusedfortalltowerslike
communicationradio,T.V.towersetc.
•Thistypeofbracinguseduptoheight
50–200m.
(8)DiamondLatticeSystem-
•Useduptoheight100-200m.
•Basedwidth1/5to1/6ofheight.

18. 1)ElectricPowerTransmission: -10-45m
2)M.TforCommunication: -50-200m
3)RadioTransmission: -50-200m
4)TelevisionTransmission: -100-300m
5)SatelliteReception: -100-300m
6)FloodLightStand: -15-50m
7)MeteorologicalMeasurement: -15-50m
8)OilDrillingMasts: -15-50m
9)OverHeadTanks: -15-50m
TYPEOFTOWERHAVINGDIFFERENTHEIGHTS-

19. MAIN COMPONENTS -
1.Peak
2.Beam
3.Waist
4.Crossarm
5.Tower Body
COMPONENTS OF MICROWAVE TOWER -

20. Components of Tower

21. DIFFERENT LOADS ACTING ON TOWER -
TYPES OF LOADS
GRAVITY
LOAD
Self weight
Weight of
Instruments
Weight of
Bracing
LATERAL
LOAD
Wind Load
Seismic Load
ACTION
LOAD
Dead Load
Live Load

22. CONFIGURATION SELECTIONOFMICROWAVE TOWER-
•Thewidthofbaseis=1/8to1/12ofthetowerheight.
•Inclinationorpitchofthesides=1/6to1/40ofthetowerheight.
•Inclinationofdiagonalsshouldbebetween45
0
to60
0
preferablyaround
50
0
.
•Solidityratio:IS875(1987)-Part3,Page.no.77,TableNo.29.
•ForcecoefficientsforsolidshapemountedonsurfacePage.no.71,Table
No.22.
•IS800(2007):Codeofpracticefordesignofsteelsections.
•IS875(1987)-Part3:Codeofpracticeforwindloadsonbuildingsand
structure.

23. ANALYSIS OF MICROWAVE TOWER -
•LATERAL LOADS DUE TO WIND ARE RESISTED BY WEB
MEMBERS MAINLY.
•VERTICAL LOADS IS RESISTED BY LEG MEMBERS.
•TO RESIST EXTERNAL MOMENTS DEVELOPED DUE TO
WIND, THE INTERNAL COUPLE IS DEVELOPED WHICH
CAUSES TENSION IN WINDWARD SIDE & COMPRESSION
IN LEEWARD SIDE.

24. DESIGN STEPS OF MICROWAVE TOWER -
•STEP1-SELECTIONOFCONFIGURATIONFORTOWER.
•STEP2-CALCULATIONSOFLOADSACTINGONTOWER.
1.CALCULATIONOFGRAVITYLOADS.
2.CALCULATIONOFLIVELOADS.
3.CALCULATIONOFWINDLOADS
•STEP3-CALCULATIONOFMOMENTSANDMEMBERFORCES.
•STEP4-DESIGNOFMEMBERSFORMAXIMUM TENSIONFORCE
ANDCOMPRESSIONFORCE.

25. •DuetoTyphoonfactors:-Extremewindforce.
•Duetolightningfactors:-Thelightningoverstructureresultinginfailure
ofthestructure..
•Externaldamagefactor.
FAILURE MODE OF MICROWAVE TOWERS -

26. THANK YOU