12000 a-Appendix i1

516-CI-E-12000

Sh.I1-1 of I1-7 NEW GC-16 IN WEST KUWAIT Rev. A Document Title: KOC Contract No. 44930 FOUNDATION CALCULATION REPORT (GENERAL) SAIPEM PROJECT NO. 032114

COMPANY DOC No.

APPENDIX I1 DESIGN OF RETAINING WALL IN FLARE AND BURNPIT AREA

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516-CI-E-12000

Sh.I1-2 of I1-7 NEW GC-16 IN WEST KUWAIT Rev. A Document Title: KOC Contract No. 44930 FOUNDATION CALCULATION REPORT (GENERAL) SAIPEM PROJECT NO. 032114

COMPANY DOC No.

TABLE OF CONTENTS Clause No. 1

2

Description

Page

GENERAL

3

1.1

Scope

3

1.2

Definitions

3

REFERENCE CODES, STANDARDS AND PROJECT DOCUMENTS

3

2.1

Codes

3

2.2

Standards

3

2.3

Project Documents

4

2.4

General Data

4

2.5

Unit Measurements

5

3

FOUNDATIONS – DESIGN CONSIDERATION

5

4

DESIGN OF RETAINING WALL FOR FLARE AND BURNPIT AREA

6

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1

GENERAL

1.1

Scope

COMPANY DOC No.

This calculation report is relevant to design of Retaining wall for “Flare and burnpit area”, at New GC-16 in West Kuwait.

1.2

Definitions Project

New GC-16 in West Kuwait

Company

Kuwait Oil Company K.S.C. (hereinafter referred as KOC)

Contractor

Alkhorayef Group

Engineering Sub-Contractor

SAIPEM S.p.A

2

REFERENCE CODES, STANDARDS AND PROJECT DOCUMENTS

2.1

Codes BS (BRITISH STANDARDS) BS 8110-1997 BS 4449-2005 BS 8004 -1986

2.2

Structural use of Concrete Specification for Carbon Steel Bars for the Reinforcement Concrete Code of practice for foundations

Standards KOC-C-001 Rev 1 KOC-C-002 Rev 1 KOC-C-003 Rev 1 KOC-C-006 Rev 1

KOC Standard for Basic Civil Engineering Design Data KOC Recommended Practice for Engineering Design Basis of Civil & Structural Work KOC Standard for Geotechnical Investigation (Onshore) KOC Standard for Concrete Work - Materials and Construction

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2.3

Project Documents SOIL REPORT

516-CB-B-10010 516-CE-A-10016 516-CE-B-11017 2.4

COMPANY DOC No.

Report for Geotechnical Investigation (Soil report by INCO-LABS Ref:INCO/P/MP/RPT/025-11) dated 03/08/2011 & Net Allowable Bearing Capacity (For Bore Hole BH-01 to BH-26 listed in Tables 1.0 to 13.0) dated 16/08/ 2011. Civil Design Basis General civil works general notes Retaining wall detail drawing

General Data c

=

Reinforced concrete unit weight = 24.00 kN/m3 (Table I – Appendix II of KOC-C-001)

ƒcu

=

Concrete minimum strength = 30.00 N/mm2 (Section 5.1 of 516-CB-B-10010)

=

c

Concrete maximum shear stress = 0.8x (fcu)0.5 = 4.38 N/mm2 (Clause 3.6.4.6 of BS 8110-Part 1 of 1997)

mc

=

Partial safety factor for concrete in flexure/ axial load = 1.5 (Table 2.2 of BS 8110-Part 1 of 1997)

ƒy

=

Reinforcement steel yield strength (for design purposes) = 414 N/mm2 (Clause 12.2.1 of KOC-C-006)

ms

=

Partial safety factor for reinforcement steel = 1.05 (Table 2.2 of BS 8110-Part 1 of 1997)

s s

As

=

Soil specific weight = 19 kN/m3

=

Net SBC = 160 kN/m2 (As per soil report)

=

Frictional coefficient = 0.40 as per Ref. INCO/P/MP/RPT/025-11

=

Area of steel

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2.5

COMPANY DOC No.

Unit Measurements The SI units shall be used

3

- Force

:

kN

- Length

:

mm

- Stress

:

N/ mm2

- Area

:

mm2

FOUNDATIONS – DESIGN CONSIDERATION 1.

Since water table is not encountered at foundation level, buoyancy effect is not considered in the design of foundations

2.

a) Factor of safety of sliding

= 1.75 (Clause 4.18 of 516-CB-B-10010)

b) Factor of safety of overturning = 1.75 (Clause 4.18 of 516-CB-B-10010) 3.

Surcharge load is not considered as there is no possibility of surcharge load

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4

COMPANY DOC No.

DESIGN OF RETAINING WALL FOR FLARE AND BURNPIT AREA 0.4

3.5

0.60

1.00 0.4

2.0

1.0

0.4

34.72 72.72

Height of earth Soil density Load factor Ka Unit wt of concrete Moment at wall base

s

c

80.72

= = = = = = =

As vertical

= =

As provd (vertical) As reqd (Horizontal) As provd (Horizontal) Weight of wall Weight of base slab Soil weight on base slab Total weight

= = = = = = =

99.28

4.10 m KN/m3 19 1.4 0.31 ( As per soil report) KN/m3 24 0.31 x 19 x 4.1 ^ 3 x 1.4 6 94.72 KNm

95 x 10 ^ 6 0.95 x 414 x 0.85 x 317 893.8 mm²/m T16 @ 200 0.13% of plan area = T12 @ 150 (791 mm²) 0.4 x 4.1 x 24 3.4 x 0.4 x 24 2 x 4.1 x 19 227.80 KN

(Ref cl 3.4.4.4

of BS 8110)

520 mm² = = =

39.36 32.64 155.8

KN KN KN

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CG of load from left end

=

Moment due to vertical load

= =

Moment due to soil pressue

=

Net moment (unfactored)

=

A

=

3.4 m²

P + M = A Z P M = A Z Overturning moment Restoring moment FOS

Z 99.28

<

160

= ,

COMPANY DOC No.

39.36 x 1.2 + 32.64 x 1.7 + 155.8 x 1 227.8 1.13 m 227.8 x ( 1.7 - 1.13 ) = 0.31 x 19 x 4.1 ^ 3 x 1.4 6 62.189 KNm

=

129.85 KNm 94.720 KNm

1.9267 m3 OK

34.72

Base shear at wall base Sliding resistance FOS

= = = = = = =

67.657 KNm 387.26 5.7238 >

1.75 ,

OK

0.5 x 0.31 x 19 x 4.1 ^ 2 49.505 KN 91.120 KN 1.84 > 1.75 ,

SAFE

99.28 - 0.4 x 24 KN/m² 89.68

Net upward pressure (toe)

= =

BM in base slab (toe)

=

Net upward pressure (heel)

= =

53.71 - 0.4 x 24 - 4.1 x 19 x 0.5 KN/m² 5.16

BM in base slab (heel)

=

Max BM As , reqd

= =

As, provd = T25 @ 200 (mm²) As reqd (minimum) As provd (distribution reinf)

= = = =

5.16 x 1 ^ 2 x 1.4 = 3.612 2 251.104 KNm 251 x 10 ^ 6 0.95 x 414 x 0.85 x 317 2369.47 mm² 2454.37 mm² 0.13% of plan area = 520 mm² T12 @ 150 (791 mm²)

Shear force in base slab

=

Shear stress in base slab Shear stress in wall

= = =

89.68 x 2 ^ 2 x 1.4 2

5.16 x 1 x 1.4 x 10 ^ 3 1000 x 317 0.02 N/mm² < 49.505 x 1.4 x 10 ^ 3 1000 x 317 0.22 N/mm² <

=

251.10

0.34 N/mm² (table 3.8 of BS 8110)

0.4 N/mm² (table 3.8 of BS 8110)

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