21-20-21-E Gantry Foundations Calculation & Basic Design

220Kv GANTRY FOUNDATIONS CALCULATIONS & BASIC DESIGN 21-20-21-E-Rev A

ANTAMINA PROJECT 220 kV VIZCARRA SUBSTATION

GANTRY FOUNDATIONS CALCULATIONS & BASIC DESIGN

Revised

Report

Approved

Date

21-20-21-E – Rev A

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220 KV VIZCARRA SUBSTATION GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN 21-20-21-E Rev. A

REVISION REV

DESCRIPTION

DATE

A

First Issue

Jun 07, 1999

220 KV VIZCARRA SUBSTATION GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN 21-20-21-E Rev. A

220 KV VIZCARRA SUBSTATION 220 KV GANTRY FOUNDATIONS CALCULATIONS & BASIC DESIGN INDEX: 220 KV VIZCARRA SUBSTATION...............................................................................................................3 220 KV GANTRY FOUNDATIONS...............................................................................................................3 CALCULATIONS & BASIC DESIGN...........................................................................................................3 1.0 PURPOSE.....................................................................................................................................................1 2.0 STANDARDS & REFERENCES...............................................................................................................1 3.0 PROJECT DATA........................................................................................................................................2 4.0 CALCULATION HYPOTHESIS..............................................................................................................3 5.0 CONCLUSION............................................................................................................................................6 ANNEXS:...........................................................................................................................................................1

220Kv GANTRY FOUNDATIONS CALCULATIONS & BASIC DESIGN 21-20-21-E-Rev A

1.0 PURPOSE

The purpose of this document is to provide the calculations for 220kV Gantry Foundations of Vizcarra Substation as a part of the civil supply for Antamina Project.

2.0 STANDARDS & REFERENCES

Codes, specifications and standards will be the last edition, unless indicated otherwise. All structures design will be according to the following documents: Norma Técnica de Edificación E.050 – SUELOS Y CIMENTACIONES. Norma Técnica de Edificación E.030 – DISEÑO SISMORRESISTENTE Código Nacional de Electricidad. Reglamento Nacional de Construcciones (RNC) Concrete Structures Norma de Concreto Armado E-60 (ININVI) ACI Standard 318 - “Building Code Requirements for Reinforced Concrete” In addition, it will be used Uniform Building Code (UBC). Additional references: American Civil Engineers Handbook by Thaddeus Merriman. Handbook of CONCRETE ENGINEERING by Mark Fintel. Documents References: 21-14-10-S Rev. A Geotechnical Study. 21-30-10-E Basic Project Criteria. Drawing References:

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220 KV VIZCARRA SUBSTATION GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN 21-20-21-E Rev. A 21-24-30-E Rev. A VIZCARRA SUBSTATION – GANTRY STRUCTURES – LOAD DIAGRAM. 21-21-30-B Rev. C VIZCARRA SUBSTATION – GRADING – PLAN Sheets 1 and 2. 21-21-31-B Rev. C VIZCARRA SUBSTATION – GRADING – SECTIONS Sheets 1 and 2. 21-34-40-E Rev. B VIZCARRA SUBSTATION – GENERAL PLAN VIEW.

3.0 PROJECT DATA

3.01 WIND: Maximum Wind Velocity = 130.00km/h 3.02 GANTRY WEIGHTS: Beam Weight=3 ton Column Weight=3 ton 3.03 SOILS PROPERTIES: qs=30.00 ton/m2 Admissible Soil Capacity φ= 34.00 grades Angle of internal friction of soil hciment=1.20 m Recommended foundation depth 3.04 STABILITY CONDITIONS: The weight soil is used as stability weight, to overturning and sliding. FS volteo= 2.00 Safety factor against overturning FS deslizamiento= 1.50 Safety factor against sliding 3.05 DIMENSIONS: hpedestal1=0.15 m Gravel height from the ground hpedestal2=0.20 m Pedestal height from the gravel bx col=1.50 m X dimension of column bz col=2.50 m Z dimension of column

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220 KV VIZCARRA SUBSTATION GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN 21-20-21-E Rev. A 3.06 SEISMIC CONDITIONS: Zone=3 (According to Reglamento Nacional de Construcciones). Tps=0.4 Predominant period hn=15 m Height of structure 3.07 LOADS: The following were the loads considered: Wind load in X direction Wind load in Z direction Cables weight #1 (positive in Z direction). Cables weight #2 (negative in Z direction). Earthquake in X direction. Earthquake in Z direction.

4.0 CALCULATION HYPOTHESIS

4.01 MAXIMUM WIND WIND LOADS: Dimensions of tower: Bini= Bfin= Htower= Ax=

2.4 m 1.2 12 21.60m2

Initial Dimension in X Direction of metallic column Final Dimension in X Direction of metallic column. Height of tower Area X

Bini= Bfin= Htower= Az=

1.2 0.6 12 10.80m2

Initial Dimension in Z Direction of metallic column Final Dimension in Z Direction of metallic column Height of tower Area Z

According to American Civil Engineers Handbook P= F wind X=

25.00psf 3937.50kg

Pressure of wind in tower

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220 KV VIZCARRA SUBSTATION GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN 21-20-21-E Rev. A W wind X= F wind Z= W wind Z=

328.13 kg/m 1968.75kg 164.06 kg/m

According to Codigo Nacional de Electricidad V= k= P= F wind X= w wind X=

130.00km/h 0.007 118.30kg/m2 2555.28kg 212.94kg/m

F wind Z= w wind Z=

1277.64kg 106.47kg/m

Wind velocity Adimensional coefficient

We assumed the loads for American Civil Engineers Handbook 4.02 SEISMIC LOADS: SEISMIC FORCES:

Wcolumna=

3.00 ton

Column weight

Wviga=

3.00 ton

Beam weight

Zone Z= S= Tps=

3 0.4 1 0.4

Zone Zone Factor Soil Factor

Hn=

15

Category = U= R=

A 1.5 10

Use Factor Reduction Coefficient

T= T= C=

0.43 2.29

hn

Ct

Fundamental period of structure Factor de amplification seismic Factor =

Z ×U × S ×C R

V = Factor ×Ptotal

V=

1.24 ton

Total Base Shear Vnudo =

V 2

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220 KV VIZCARRA SUBSTATION GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN 21-20-21-E Rev. A V nudo=

0.62 ton

Horizontal seismic force at nodes Sis .Vert .Col = 0.3 × Wcolumna

Sis. Vert. Col=

0.90 ton

Vertical seismic force at columns Sis .Vert .Vig = 0.3 × Wviga

Sis. Vert. Vig=

0.90 ton

Vertical seismic force at beams

4.03 CABLE WEIGHTS The cable weights are as shown in project drawings. 4.04 LOAD COMBINATIONS: The following were the combinations considered (see Annex #1). Cables Weight #1 (#2). Cables Weight #1 (#2) + Wind load in Z direction (+ or -) Cables Weight #1 (#2) + Wind load in X direction (+ or -) Cables Weight #1 (#2) + Earthquake load in Z direction (+ or -) Cables Weight #1 (#2) + Earthquake load in X direction (+ or -) Cables Weigh #1 + Cables Weight #2. The following were the combination design loads: Cables weight #2. Cables weight #2 + Wind load in Z direction (-). Cables weight #2 + Wind load in X direction (+). 4.05 FOOTING DESIGN The procedures to the footing design as shown in Annex #2, and include the following: CHECK THE STABILITY CONDITIONS:

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220 KV VIZCARRA SUBSTATION GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN 21-20-21-E Rev. A To overturning (the weight soil is considered as stability force). To sliding (the weight soil is considered as stability force). CHECK THE SOIL CONDITIONS: Soil Bearing pressure at base footings by uni -axial loading Soil Bearing pressure at base footings by biaxial loading STRESS CHECK: Flexion Design Beam action (at d from support face) Flexion Design. Shear design in One - Way action In X direction In Z direction: Shear design in Two - Way action (at d/2 from support face) FORCE TRANSFER AT INTERFACE OF COLUMN AND FOOTING 4.06 PEDESTAL DESIGN The procedures to the pedestal design as shown in Annex #2, and include the following: CHECK BY FLEXION ACTION. CHECK BY TRACTION ACTION.

5.0 CONCLUSION

According to analysis is recommended deepen the bottom level of footing to perform with Stability conditions. FINAL DIMENSIONS: FOOTING: Lx = 2.95 meters.

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220 KV VIZCARRA SUBSTATION GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN 21-20-21-E Rev. A Lz = 4.15 meters. H zap = 0.45 meters. Foundation depth = 2.40 meters. COLUMNS: Bx column = 0.60 meters. Bz column = 0.60 meters.

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220Kv GANTRY FOUNDATIONS CALCULATIONS & BASIC DESIGN 21-20-21-E-Rev A

ANNEXS:

ANNEX #1 LOADS AND LOADS COMBINATIONS WIND IN X (SHEET) WEIGHT OF CABLES 1 (SHEET) WIND IN Z (SHEET) WEIGHT OF CABLES 2 (SHEET) WEIGHT OF CABLES 3 (SHEET) EARTHQUAKE IN X (SHEET) EARTHQUAKE IN Z (SHEET) LOAD COMBINATION (SHEET) ANNEX #2 DESIGN LOAD 1 (WCAB2+WIND X) General Notes (Sheet) Earthquake (Sheet) Wind (Sheet) Footing Design (Sheet) Pedestal (Sheet) Sketch (Sheet) Earth Pressure (Sheet) Reinforcement (Sheet) DESIGN LOAD 2 (WCAB2+WIND Z)

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220 KV VIZCARRA SUBSTATION GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN 21-20-21-E Rev. A General Notes (Sheet) Earthquake (Sheet) Wind (Sheet) Footing Design (Sheet) Pedestal (Sheet) Sketch (Sheet) Earth Pressure (Sheet) Reinforcement (Sheet) DESIGN LOAD 3 (WCAB2) General Notes (Sheet) Earthquake (Sheet) Wind (Sheet) Footing Design (Sheet) Pedestal (Sheet) Sketch (Sheet) Earth Pressure (Sheet) Reinforcement (Sheet)

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