Nonlinear deformations of a floor slab supported along the contour with holes

The development of non-linear deformations in slabs supported along the contour and weakened by holes is evaluated. The data and main features of full-scale testing of slabs, the results of measurements of deflections, settlements of supports, surface deformations on the lower surface of the slab, and crack opening widths are presented. The patterns of cracks at each stage of loading structures with an external load are described. Large holes affect the distribution of forces. The interruption of the longitudinal working reinforcement along the short side leads to a delay in the growth of forces in the ratio of 1:3 in the zones of the slab without holes, 1:2 in the zones with holes. The bearing capacity of the slabs was determined based on the test results. The deflection of 1.25 mm achieved with a control load of 0.51 tf/m2 is lower than the calculated 4.3 mm. Data on the possibility of constructing a picture of cracks, yield lines as a result of computer calculation have been obtained.