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Substation Loading

The document summarizes load calculations for structural analysis of an overhead line, including: 1) A static conductor tension load of 1000 N assumed for safety. 2) A short circuit load of 0 N according to the original calculations. 3) Dead loads including support structure weight of 19630 N and insulator weight of 730 N. 4) Ice loads of 38976 N on the structure and 968 N on the insulator. 5) Seismic loads calculated based on site conditions and structural properties, with a design spectral acceleration of 0.733 resulting in a seismic load on the structure.

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Safi Zabihullah Safi
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513 views2 pages

Substation Loading

The document summarizes load calculations for structural analysis of an overhead line, including: 1) A static conductor tension load of 1000 N assumed for safety. 2) A short circuit load of 0 N according to the original calculations. 3) Dead loads including support structure weight of 19630 N and insulator weight of 730 N. 4) Ice loads of 38976 N on the structure and 968 N on the insulator. 5) Seismic loads calculated based on site conditions and structural properties, with a design spectral acceleration of 0.733 resulting in a seismic load on the structure.

Uploaded by

Safi Zabihullah Safi
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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2- Conductor Tension Load:

SCT= : Static Conductor Tension Load 1000 N


NOTE: There is no information with regards to Conductor Tension Load in the original calculation
report, however the load is assumed as 1000 N to be on the safe side.

3- Short Circuit Load:

SCL= : Short Circuit Load 0N

NOTE: The SCL load is taken 0 according to original calculation report, In the original calculations, it
is noted as "Jumper to switch" with regards to the short circuit load.

4- Dead Loads:

i- Structure:
W STR= : Weight of support (including plate, bolts, nuts, galv.) 19630 N

NOTE: Weight of support structure is calculated by the software and included into the analysis by
distributing to the relevant nodes in the relevant section. An adjustment factor of 1.2 (named as
DLAF) is input to the model in order to include the weights of plates, bolt&nuts, galvanization etc.

ii- Insulator:
W eqp= : Weight of equipment 730 N
5- Ice Loads:

tice= : ice thickness 38 mm


gice= : ice unit weight 9000 N/mm³
IFI= : importance factor for ice thickness 1.00
ILSTR= : Ice load on structure(taken from analysis model) 38976 N

NOTE: In analysis software, load factor on ice load can't be input separately. Also, it is not multiplied
by dead load factor. But it is multiplied by DLAF and included into the analysis. As DLAF and load
factor are same (both equal to 1.2), it not necessary to adjust the IL STR in the analysis model

ILeqp= p /4*(d eqp-i ²-d eqp ²)*L eqp * g ice *I FI : Ice load on insulator 968 N

6- Seismic Loads:

SS= : 0.2sec map ground motion spectral response acceleration 1.0 g


S1= : 1.0sec map ground motion spectral response acceleration 0.5 g
SC= : soil site class D
Fa= : acceleration based site coefficient (from Table 3-12) 1.1
Fv= : velocity based site coefficient (from Table 3-13) 1.5
SDS= (2/3)*F a *S S : spectral response acceleration from eqn. 3-6 0.733
SD1= (2/3)*F v *S 1 : spectral response acceleration from eqn. 3-7 0.500
Sa= : design spectral response acceleration 0.733
NOTES:
1- S s , S 1 & SC are taken from contract drawing sheet XS-051
2- T ≈ 0.184sec < S D1 /S DS = 0.5/0.733=0.682 --> S a =S DS
According to eqn. 3-10 in clause 3.1.7.1: FE=(Sa/R)*W*IFE*IMV
EQH=FE= Seismic design lateral force (N)
: importance factor for EQ loads (for structures and equipment
IFE-str= 1.25
essential to operation from clause 3.1.7.2 )

: importance factor for EQ loads (anchorage for structures and


IFE-a= 2.00
equipment essential to operation from clause 3.1.7.2 )
IMV= : single mode behavior 1.00

: structure response modification factor (for steel&aluminum bus


R= 2.00
supports & USD type analysis method from 3.1.7.3)

i- Seismic Load on Structure


On DS support structure, earthquake load on dead weight of steel structure is distributed onto the 8
nodes at beam- column connection level. For each beam- column connection, the horizontal and
vertical load is calculated according to the total weight of column and half weight of connected beam.
Horizontal EQ loads (EQH) are applied in X and Y directions in separate load combinations and
vertical EQ loads (EQV) are applied in down and up directions.
In the figure below, application of EQH loads on the gantry structure is shown as sample.

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