Calc Front SheetDOCUMENT NoCALCULATIONSOFFICEPROJECT TITLESUBJECTSHEET NoREINFORCED CONCRETE EARLY THERMAL CHECKISSUETOTAL SHEETSAUTHORDATECHECKED BYDATEAPPROVED BYDATECOMMENTS1GDB2345SUPERSEDES DOC NoDATEDESIGN BASIS STATEMENT (Inc. sources of info/data, assumptions made, standards, etc.)

DOCUMENT No. (Project/ Doc)SHEET No.1 OFPROJECT TITLE

mainDOCUMENT NoSHEETPH9-0A-33-72-C912OFSUBJECTGROUND FLOOR TOP SLAB - EARLY THERMAL CHECKSUBJECTCALCULATIONSOUTPUTReferences.BS8007 1987 / BS8110 1997 - Part 1 / BS8110 1985 - Part 2Slab markS250Location:GROUNDSize & Material Properties:Cube Strength of Conc., fcu35N/mm2Crack width, Wmax0.3mmRestraint factor, R0.5Section Thickness, h250mmConcrete cover, c50mmBar size, f12mmBar spacing, s200mmgms for steel1.05Type of reinforcement1Steel strength, fy460N/mm2Steel modulus, Es200000N/mm2Average bond strength between concrete & steel, fb2.4N/mm2Direct tensile strength of immature concrete, fct1.60N/mm2Effective depth, d = h - c - f / 2194mmSteel area provided in b=1000 mm wide zone, As565mm2565Steel ratio provided over gross area, pg = As / (b h)0.00226194670.00131Wall/Suspended-slab/Top of ground slab: SurfaceZone Depth, hs125mmCoefficient of Thermal Expansion for mature concrete, a1.00E-05T1, fall in temperature between the hydration peak and ambient30oCT2, fall in temperature because of seasonal variations20oCEffective Strain, e = R a (T1+T2)0.000250Likely maximum spacing of cracks, Smax = Wmax / e1200.0Steel requirements in surface zone, as per Appendix A of BS 8007:1- Steel ratio to control crack widths, pcrw = fct f / (2 fb Smax)0.0033332- Critical Steel ratio to distribute cracking, pcrit = fct / fy0.0034783- Minimum Steel ratio as per Table A.1 BS 8007, pmin0.003500Hence, Steel ratio required, preq0.003500Required Steel Area in 1000mm x hs deep surface zone = 1000 preq hs438mm< 565 provided, Hence OK

Deformed Type 2Plain RoundWall / Suspended-slab / Top of ground slabBottom of ground slabConcrete Surface ZoneUsing Fig A1 & A2 of 8007, for:Walls, hs=h/2