Table of Contents
Shrinkage cracks in concrete occur when excess water evaporates out of the hardened concrete, reducing the volume of the concrete.
Deformation of structure under sustained load. It’s a time dependent phenomenon. This deformation usually occurs in the direction the force is being applied. Like a concrete column getting more compressed, or a beam bending.
Creep does not necessarily cause concrete to fail or break apart. Creep is factored in when concrete structures are designed.
έDS= 0.5 x (-300×10-6)
Refer BS 8110 Clause 7.4.3.4 Table 29
RF = έDS x Ec x A(slab) x φ
RM = RF x eccentricity
Eccentricity = y top of composite section – half of slab thicknes
Restrained Stress (RS) = έDS x Ec x Ф
Axial Release (AR) = RF / X-sec area
Moment Release (MR) = RM x y / inertia
(for top and bottom stresses)
Σ(RS , AR , MR)
Σ(MR , AR)
Dead = 2.0, SDL = 2.3, Prestressing = 2.2
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