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Design Guide for Ring Beam Foundation Design using BS 8110
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STRUCTURAL CALCULATION REPORT
RING BEAM FOUNDATION
POTABLE WATER STORAGE TANK
Potable Storage Water Tank
QUALITY CONTROL SHEET
STRUCTURAL DESIGN CALCULATION REPORT : RING BEAM FOUNDATION
DOCUMENT
ABHA, in the Kingdom Kingdom of Saudi Saudi Arabia
PROJECT
Ring Beam Foundation
CODE AUTHOR
SIGNATURE
AHN
DATE (DD/MM/YY) ( REVISION)
10-12-2017
SIGNATURE
AHN
DATE
10-12-2017
APPROVED DESTINATARY
Potable Storage Water Tank
AZIZ Company for Contracting & Industrial Investment
1.
INDEX INTRODUCTION ............................................ ............................................... ...................... 3
3.1.
KEY PLAN ..........................................................................................................................
STEEL REINFORCEMENT ........................................................................................................................ 6 CONSTRUCTION PROCESS.............................................. .............................................. . 7
5.1.
FORM WORKS ................................................................................................................................................7
5.2.
PROTECTION OF CIVIL WORKS .......................................................................................................... 7
5.3.
CONSTRUCTION JOINTS ......................................................................................................................... 7 GEOTECHNICAL DATA & CHECKS.................................................................................
8
6.1.
NET SAFE BEARING CAPACITY ........................................................................................................... 8
6.2.
FOUNDATION PROPOSAL ....................................................................................................................... 8 APPLIED LOADS .......................................... ............................................... ...................... 9
TANK DATA ................................................................................................................................................... 11
INTRODUCTION The present reports refer to the structural design of RING BEAM FOUNDATION STABILITY & STRENGTH CHECKS. For potable water storage tanks at south of ABHA city.
Potable Storage Water Tank
3.
KEY PLAN
Potable Storage Water Tank
4.
DESIGN CRITERIA REFERENCED CODES AND STANDARDS
3.1.
The following codes were used in the present report: Saudi Building Codes (2007):
SBC 301: Loading and Forces
SBC 303: Soil and Foundations
International and American Codes:
IBC‐2006: International Building Code
ASCE 7: Minimum Design Loads for Buildings and other Structures, 2005.
ASTM: for mix design and concrete properties.
ACI318’14 : for concrete sections design.
Potable Storage Water Tank
5.
MATERIALS CONCRETE
4.1.
Blinding concrete shall comply with the Concrete Mix Class A Type SRC (Sulphate Resistance Portland cement Type V): Minimum characteristic strength fc’ 20 MN/m 2
Structural concrete has to comply with the following specifications:
Minimum characteristic strength fc’ 40 MN/m 2 (at 28 days per ASTM C31/39 cylinder test)
Minimum cementitious content 370 kg/m3
Fly ash content not less than 10% of cementitious materials 50 kg/m3
Max. Free water / cementitious material ratio 0.40
Hot weather precautions: The overall maximum temperature limit for fresh concrete when starting to place it in its final position is 30º C. Concrete cover of steel reinforcement bars: 70 mm on any steel in civil or plant works in contact with soil, the tolerances on the cover layer. Measured at any point shall be ± 5 mm on the above dimensions.
fc’
Element
4.2.
(MPa)
Plain Concrete
20.0
Reinforced Concrete
40.0
STEEL REINFORCEMENT
Steel reinforcement of concrete has to comply with ASTM A615/A615M‐14 Grade 60 (Standard Specification for Deformed and Plain Carbon‐Steel Bars for Concrete Reinforcement). The tensile yield strength shall be not less than 420 MPa. The ductility class B is required.
Element
Reinforcement Rebar
Potable Storage Water Tank
Grade ASTM A615
Fy (MPa) 420.0
6.
CONSTRUCTION PROCESS 5.1.
FORM WORKS
All concrete formwork shall be impervious in order to prevent moisture loss. All concrete surfaces below ground level shall have ordinary finish and all concrete surfaces above ground level shall have fair face concrete finish. All visible corners shall be chamfered with triangular fillets 20/20 mm. Ties through the concrete shall not be accepted in structures, which are subjected to a one‐side water pressure.
5.2.
PROTECTION OF CIVIL WORKS
All concrete structures with a floor level below permanent grade shall have the underground part completely encased in a tanking made from two layers bituminous coating insulation. The tanking on the sides and the tops of the structures shall be fully torch‐applied on a bitumen primed surface. The tanking under the structure shall be laid on a concrete blinding. All overlaps shall be minimum 100 mm and f ully torch‐welded. The protection material shall continue to a level not less than 0.20 m above final grade (Station elevation). All exposed underground coatings and membranes shall be protected to prevent damage during backfill.
5.3.
CONSTRUCTION JOINTS
Construction joints are pre‐planned and indicated in the construction drawings.
Potable Storage Water Tank
7.
GEOTECHNICAL DATA & CHECKS
6.1.
NET SAFE BEARING CAPACITY
It is recommended to design Tank foundations with safe bearing capacity of 250 KN/m 2. The maximum expected settlement will be less than 15 mm under the imposed pressure of 250 KN/m 2. It is recommended to remove all boulders from the bottom of the excavation for foundations. The bottom of excavation for foundations shall be prepared using blinding concrete with a minimum cement content of 200 kg/m3 and a characteristic strength of minimum 20 N/mm2.
6.2.
FOUNDATION PROPOSAL
Site preparation will be in form of grading and leveling. Before starting the construction activities, the site shall be stripped and all the cobbles and boulders must be removed. To make the project site leveled, cutting and filling activities are involved. In case of filling below the ring beam foundation, blinding concrete with a minimum cement content of 200 kg/m3 and a characteristic strength of minimum 2 N/mm2 is required. Shallow foundation with a concrete ring beam (Inverted T‐Section) according to the submitted drawings.
Potable Storage Water Tank
8.
APPLIED LOADS 7.1.
LOADS
All Loads will be according to the design THCEK & Sungchang JV as per table below:‐
7.2.
ROOF LIVE LOADS
The minimum distributed and concentrated loads considered as imposed live loads will be in accordance with the table below: Description Inaccessible roof
