calculation note assesment transmission tower b74, b75, & l56_rev a

8/10/2019 Calculation Note Assesment Transmission Tower B74, B75, & L56_Rev A

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TABLE OF CONTENTS

1. GENERAL

1.1 Scope of Work1.2 Standard, Codes, and Reference

1.3 Basic Assumption

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CALCULATION NOTEASSESMENT TRANSMISSION TOWER

B74, B75, & L56

REV DATE PAGE DESCRIPTION PREP'D CHK'D AP COMP.A 2!1!21" #$#%#A& #SS'( A& $$ RW%


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1.3.1 Basic )esi*n

1.3.2 Soft+are

1.3.3 &oad Comination

1.3." &oad Case

. RESULT

!. CONCLUSION

1. GENERAL

1.1 S"#$% # W#(

%-is cacuation note is prepared for re!anasis of %ransmission %o+er.

1. S)*+*, C#%-, *+ R%%%+"%

%-e isted eo+ documents are appicae standard, codes, and reference to e usedto support t-is cacuation 0

! American #nstitute of Stee Construction %-irteent- (dition A#SC 13t-!&R)

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! ASC( 4!5 Wind &oad

! S$# 3!1426!22 Seismic &oad

1.! B*-" A--/0$)#+

1.!.1 B*-" D%-+

E2-)+ T#3%

$o #tem )escription

1 7ateria A36 and A542 r 6

2 Beam Sie As per reference dra+in*

3 Cae )iameter 0 21 mm, )ensit 0 1969 k*/km.

" Conductor Wei*-t 0 66 k* assumption

5 Basic Wind Speed " m/s ASC( 4!56 Seismic &oad :one 2 on ;ard Soi S$# 22

T%0$#* T#3%

$o #tem )escription

1 7ateria SS"

2 Beam Sie &45


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1.!.4 L#* C*-%

enera oad cases are 0

1. )ead oad

2. Wind oad

3. (art-@uake oad

7ain purpose t-is assessment is to kno+ stren*t- of to+er due to corrosion. We+i simuate transmission to+er +it- corrosion on to+er structure. Corrosion

t-ickness +i use aera*e corrosion t-ickness as inspection to site is 1 mm.

%-is is ecome main oad case e


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As aoe data, t-e to+er stee structure is acceptae +it- corrosion 1 mm.

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!. CONCLUSION

enera concusion for a to+ers B4", B45, and &56 as summar eo+0

Corrosion of stee to+er +as predicted aera*e 1 mm.

Arms of t-e to+er +-ic- support t-e cae -i*- ota*e are as critica condition due to

corrosie assumed ad corroded on arms of to+er stee memer.

>otentia stee t-ickness +i e reduced more t-an t-e assumed. #t +i cause

decreasin* t-e inte*rit of t-e to+er structure.

#f t-e to+er structure is on ad corroded, t-e to+er structure is predicted on fati*uecondition. %-e ifetime to+er structure is reduced.

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&o+er and coumn to+er structure -ae sufficient stren*t- on a oad comination

dead oad, +ind or seismic.

#f t-e to+er structure is on ad corroded condition, t-e to+er structure s-a e

repaced +it- ne+ one. %emporar support is needed especia on arms of t-e to+er

structure to retain t-e structure due to decreasin* t-e inte*rit of structure.

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calculation note assesment transmission tower b74, b75, & l56_rev a

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