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 Royal Commission for Juabil & Yanbu
Royal Commision in Jubail		Calculation Sheet
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Project Title: Ras Al Khair Industrial CityContract No:027-T04Designed by:MIQ
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Task No:
4Date : 30/10/2012
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Calc No: 181-C01-CALCS-20LS-SA-001Design Stage:90% SubmittalChecked by:MAW
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Subject:
 Design of Arch Culvert
Revision:
ADate : 30/10/2012
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PART A: DESIGN OF ARCH CULVERT
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1,0GENERAL DESCRIPTION AND DESIGN METHODOLGY
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The proposed cast-in-situ unreinforced concrete structures is a multi-cells storm drainage Culvert along road (Typical). The structure is designed as moment and shear resisting frames consisting of unreinforced precast concrete arches roof and unreinforced conrete walls on continuous unreinforced base slab serving as mat foundation supported by node springs. The whole structure is modelled as series of elements, analyzed and designed by STAAD Pro structural program in accordance with ACI Code, using Ultimate Strength Design (USD) method. All applicable loads are in accordance with MOT and AASHTO requirements and applied on structure such as dead loads, selfweight, soil pressure and surcharge on exterior walls etc. Wheel load pressure per MOT Design Trucks & Lane Loads such as; standard lane- load per lane 20 kN/m UDL, 150 kN for moment and 220 kN concentrated loads spread over lane width; 3 axle 600 kN (61.2T) truck per lane, and 320 kN (32.62T) hypothetical single axle load per lane are applied on structure in different loading pattern/cases similar to a moving loads All these loads are applied systematically in various critical load combinations with corresponding load factor multipliers, as required by AASHTO. Please refer to design load calculations, Wheel Loads Summary Table and diagrams. Arch culverts are designed to safely withstand the vertical and lateral loads due to traffic and earth and comply with minimum factors of safety and 100 kPa recommended net allowable bearing capacity as per RC manual.
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2,0DESIGN CRITERIA:
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Dead Loads :
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Normal concrete weight =24kN/m3
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Unit weight of soil
=19kN/m3
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Unit weight of asphalt=21kN/m3
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Minimum Uniform Distributed Live Load Per RC Guideline, wL(min) =5,00KPa
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Live Loads:
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Traffic Loads see wheel load calculations
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Thermal Loads
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Change in Temperature (Expansion Joints provided) =25OC
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Materials:
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Concrete, f c C30b or 4.35 Ksi =30MPa
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Fusion bonded epoxy coated rebar, fy 414 MPa
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Steel Modulus of Elasticity, E s
29007 Ksi=200000 MPa
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Minimum concrete cover=75 mm
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Soil Properties:
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Soil unit weight, ws
=21kN/m3
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Soil bearing capacity, SBC
For (DC -004),=100 KPa
Assumed
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Soil coefficient against sliding, =0,4
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Factors of Safety:
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Against overturning,F.S(O.T)=2
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Against sliding,F.S(SLIDING)=1,5
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Against uplift,F.S(U)=1,1
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Load Factors and Constants:
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Per AASHTO Standard Specifications, 16th Ed.
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Dead load, DL=1,3
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Traffic Wheel Live load, LL
=2,171
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Earth Pressure on Walls
=0,65
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Beta,=0,75
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Phi,=0,9
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Per ACI 318-05, (Load Combination 9-7)
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Dead load, DL=0,9
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Earthquake Forces
=1,00