Concrete Creep, Shrinkage Factors and Tensile Strength Calculation
This spreadsheet provides values of creep factors, concrete tensile strengths and free shrinkage strains for use with
hnite element slab design programs that take account of concrete cracking (non-linear analysis). The methods used
are those recommended in Concrete Society Technical Report No TR58. With programs that do not account for
cracking, substantially higher creep factors should be employed, to allow forthe increased displacements caused by
cracking and shrinkagelf each stage is analysed with its' own tp factor and fctm, then Z and fctm forthe critical load
case should be used at subsequent stages. If the calculation method employed does not do this, say NO at cell Jl4_
For slabs with nominal or low restraint use fctmtl, and for severe restraint use fctm. An intermediate value may be
usedi
This spreadsheet provides values of creep factors, concrete tensile strengths and free shrinkage strains for use with
hnite element slab design programs that take account of concrete cracking (non-linear analysis). The methods used
are those recommended in Concrete Society Technical Report No TR58. With programs that do not account for
cracking, substantially higher creep factors should be employed, to allow forthe increased displacements caused by
cracking and shrinkagelf each stage is analysed with its' own tp factor and fctm, then Z and fctm forthe critical load
case should be used at subsequent stages. If the calculation method employed does not do this, say NO at cell Jl4_
For slabs with nominal or low restraint use fctmtl, and for severe restraint use fctm. An intermediate value may be
usedi