TESTING OF HOLLOW-CORE END NOTCHED FLOOR SLAB

This paper examines the test results of a hollow-core reinforced concrete prestressed end-notched floor slab of formwork formation subjected to uniformly distributed load. 
The research of the end-notched slab was    carrying out in the testing hall of the State Enterprise "State Research Institute of Building Structures" according to the procedure of standard DSTU B B.2.6-7. 
Vertical uniformly distributed load was applied to the end-notched slab with cross-rails and support fixtures for loading, with hydraulic jacks and pumping station equipped with force meter. 
The end-notched slab was subjected to step-by-step loading with load steps of 100 kgf/m2. 
Inspection of the surface of the end-notched slab in the test area, with recording in the register of measurement results of displacements and potential damages was carried out after every loading step. 
Vertical displacements of the end-notched slab corners were measured with four clock type indicators ICH-10. Vertical displacements of the middle slab span were measured with two deflectometers 6PAO. The middle span deflection of the end-notched slab was calculated considering corner displacements. 
Based on the results of research, it was established that before applying the load             of 800 kg/m2 there were not detected cracks the opening width of which exceeded the limit values. 
The loss of loadbearing capacity of the end-notched slab was detected after the load of     1280 kgf/m2, which which exceeded the design load by 1.6 times. The end-notched slab collapsed due to loss of shear resistance. 
According to the test results, it was established that hollow-core reinforced concrete prestressed end-notched floor slab meets the requirements of strength, stiffness and crack resistance.