21-20-21-e gantry foundations calculation & basic design

ANTAMINA PROJECT

220Kv GANTRY FOUNDATIONS CALCULATIONS & BASIC DESIGN

21-20-21-E-Rev A

9220 KV VIZCARRA SUBSTATION

GANTRY FOUNDATIONS CALCULATION & BASIC DESIGN

21-20-21-E Rev. A

ANTAMINA PROJECT

220 kV VIZCARRA SUBSTATION

GANTRY FOUNDATIONS

CALCULATIONS & BASIC DESIGN

RevisedApprovedDate

Report

21-20-21-E Rev A

REVISION

REVDESCRIPTION

DATE

AFirst Issue

Jun 07, 1999

220 kV VIZCARRA SUBSTATION

220 kV gantry foundations

calculations & basic design

INDEX:

11.0 PURPOSE

2.0 STANDARDS & REFERENCES13.0 PROJECT DATA23.01 Wind:23.02 Gantry Weights:23.03 Soils Properties:23.04 Stability Conditions:23.05 Dimensions:23.06 Seismic Conditions:33.07 Loads:34.0 CALCULATION HYPOTHESIS34.01 Maximum Wind3WIND LOADS:3Dimensions of tower:3According to American Civil Engineers Handbook4According to Codigo Nacional de Electricidad44.02 Seismic Loads:4SEISMIC FORCES:44.03 Cable weights54.04 Load Combinations:54.05 Footing Design6CHECK THE STABILITY CONDITIONS:6CHECK THE SOIL CONDITIONS:6STRESS CHECK:6Flexion Design Beam action (at d from support face)6Shear design in One - Way action6Shear design in Two - Way action (at d/2 from support face)6FORCE TRANSFER AT INTERFACE OF COLUMN AND FOOTING64.06 PEDESTAL DESIGN6CHECK BY FLEXION ACTION.6CHECK BY TRACTION ACTION.65.0 conclusion7Final dimensions:7FOOTING:7COLUMNS:7ANNEXS:1ANNEX #1 LOADS AND LOADS COMBINATIONS1WIND IN X (sheet)1WEIGHT OF CABLES 1 (sheet)1WIND IN Z (sheet)1WEIGHT OF CABLES 2 (sheet)1WEIGHT OF CABLES 3 (sheet)1EARTHQUAKE IN X (sheet)1EARTHQUAKE IN Z (sheet)1LOAD COMBINATION (sheet)1ANNEX #21DESIGN LOAD 1 (wcab2+wind X)1General Notes (Sheet)1Earthquake (Sheet)1Wind (Sheet)1Footing Design (Sheet)1Pedestal (Sheet)1Sketch (Sheet)1Earth Pressure (Sheet)1Reinforcement (Sheet)1DESIGN LOAD 2 (wcab2+wind Z)1General Notes (Sheet)2Earthquake (Sheet)2Wind (Sheet)2Footing Design (Sheet)2Pedestal (Sheet)2Sketch (Sheet)2Earth Pressure (Sheet)2Reinforcement (Sheet)2DESIGN LOAD 3 (wcab2)2General Notes (Sheet)2Earthquake (Sheet)2Wind (Sheet)2Footing Design (Sheet)2Pedestal (Sheet)2Sketch (Sheet)2Earth Pressure (Sheet)2Reinforcement (Sheet)2

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 Tcnica de Edificacin E.050 SUELOS Y CIMENTACIONES.

Norma Tcnica de Edificacin E.030 DISEO SISMORRESISTENTE

Cdigo 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:

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

= 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

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=2.4 mInitial Dimension in X Direction of metallic column

Bfin=1.2Final Dimension in X Direction of metallic column.

Htower=12Height of tower

Ax=21.60m2Area X

Bini=1.2Initial Dimension in Z Direction of metallic column

Bfin=0.6Final Dimension in Z Direction of metallic column

Htower=12Height of tower

Az=10.80m2Area Z

According to American Civil Engineers Handbook

P=25.00psfPressure of wind in tower

F wind X=3937.50kg

W wind X=328.13 kg/m

F wind Z=1968.75kg

W wind Z=164.06 kg/m

According to Codigo Nacional de Electricidad

V=130.00km/hWind velocity

k=0.007Adimensional coefficient

P=118.30kg/m2

F wind X=2555.28kg

w wind X=212.94kg/m

F wind Z=1277.64kg

w wind Z=106.47kg/m

We assumed the loads for American Civil Engineers Handbook

4.02 Seismic Loads:

SEISMIC FORCES:

Wcolumna=3.00 tonColumn weight

Wviga=3.00 tonBeam weight

Zone3Zone

Z=0.4Zone Factor

S=1Soil Factor

Tps=0.4Predominant period

Hn=15Height of structure

Category =AIndustrial Buildings, Sub -Stations, etc.

U=1.5Use Factor

R=10Reduction Coefficient

T=0.43Fundamental period of structure

C=2.29Factor de amplification seismic

V=1.24 tonTotal Base Shear

V nudo=0.62 tonHorizontal seismic force at nodes

Sis. Vert. Col=0.90 tonVertical seismic force at columns

Sis. Vert. Vig=0.90 tonVertical 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:

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 FOOTING4.06 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.

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.

ANNEXS:

ANNEX #1 LOADS AND LOADS COMBINATIONS

WIND IN X (sheet)

WEIGHT OF CABLES 1 (sheet)

WIND IN Z (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)


Earthquake (Sheet)

Wind (Sheet)


Pedestal (Sheet)

Sketch (Sheet)



DESIGN LOAD 3 (wcab2)


Earthquake (Sheet)

Wind (Sheet)


Pedestal (Sheet)

Sketch (Sheet)



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