Enq / Job Title :Lisboa Palace - Column Formwork (Max 2.3m Height)Enq / Job No. :Sheet No.1 Drawing No. :DateInitialsCALCULATION Calculation of Concrete PressureAccording to CIRIA REPORT 108,Max. concrete pressure on formwork, Pmax= D[C1R0.5 + C2K(H-C1R0.5)0.5] or Dh kN/m2, which is smaller.Vertical form heightDensity of concreteCoefficient dependent on the size & shape of formwork(see Table 1 below)Coefficient dependent on the constituent materials of the concrete(see Table 1 below)Rate ast which the concrete rises vertically up the formH =D =C1 =Dec-172.3m24kN/m31.5(1.5 for Column)C2 =0.45R =2m / hroConcrete temperature at placingT =30CIn general, the concrete temperature is around 30 degree for the fresh concrete just discharged from the vehicle2K = (36/(T+16))=0.612Pmax =DhOR2.3a=2.2382=55.2kN/m0.5 0.50.5Pmax =D[C1R+ C2K(H-C1R)]2=53.71kN/m2Take smaller Pmax =53.71kN/m0.06253.71Pressure DiagramTable 1 Values of coefficient C1 and C2WallColumnC1 = 1.0C1 = 1.5Value of C20.30.30.450.450.450.60.6Type of concreteOPC, RHPC or SRPC without admixturesOPC, RHPC or SRPC with any admixture, except a retarderOPC, RHPC, or SRPC with a retarderLHPBFC, PBFC, PPFAC or blends containing less than 70% ggbfsor 40 % PFA without admixturesLHPBFC, PBFC, PPFAC or blends containing less than 70% ggbfsor 40 % PFA with any admixtures, except a retarderLHPBFC, PBFC, PPFAC or blends containing less than 70% ggbfsor 40 % PFA with retarderBlends containing more than 70% ggbs or 40% PFAEnq / Job Title :Lisboa Palace - Column Formwork (Max 2.3m Height)Enq / Job No. :Sheet No.2 Drawing No. :DateInitialsCALCULATIONDesign of 18mm Plywood2=53.708kN/mDec-17Concrete PressureSpanMZM / ZVAvV / Av4===53.71x1000x0.251822250mm//106=0.3357kNm=000mm3=6.2162N/mm2<22.11N/mm2OK==53.71x1000x0.2518/2=6.7135kN=18000mm2=<0.373N/mm20.795N/mm2OKMaximum Deflection =1145x53.708x178500x250486000x1=0.017mm
27.069kN(M12 Grade 8.8 bolt)OKTension Capacity=p /4Enq / Job Title :Lisboa Palace - Column Formwork (Max 2.3m Height)Enq / Job No. :Sheet No.6 Drawing No. :DateInitialsCALCULATIONDec-17SKETCH OF THE FORMWORKS (Column width < =2000mm, Height <=2.3m )SUMMARY OF THE FORMWORKSMember (1)Member (2) -Vertical StudMember (3) -Waling15mm thk. Plywood50x70mm Timber @ 250 mm c/c2 nos of 50x70mm Timber @ 600mm c/c M12 Grade 8.8 Tie boltmax2000Member (4) - TieBarMax cantilever length of secondary bearer is 320mmmax600Concrete pressure=53.71kN/m22m / hrPouring rate=Design review is required if the pouring rate excessed the design limited
