Bearing Capacity And Deformations When Bending The Multi-Hollow Floor Slab With Stops At The Ends (In Order Of Discussion)

Abstract

Prefabricated multi-hollow-core slabs in precast-monolithic floors are placed in dense groups and persisted their ends in bearing beams. Various studies show that in the plane of such a floor under the action of a vertical load both along and across the slabs arise reactive thrust forces. They noticeably extinguish the load-induced forces in the sections of the slabs. This is accompanied by an increase in the bearing capacity and stiffness of the floors. But taking into account the spacer forces under modeling conditions in finite element calculations of software systems is difficult and requires additional research. By results of full-scale tests and the analysis conducted by the authors, it is established that due to the support of a multi-hollow floor slab with persisted on end faces along its axis under loading the longitudinal reactive rebuff is formed. Proposals are made to estimate its magnitude at various stages of the slabs operation up to its destruction. To ensure flat ceilings of precast-monolithic overlap, the case of supporting the plate on concrete dowels of load-bearing crossbars placed in the cavities of the plate is also considered. Based on the norms of the Russian Federation, the strength of key support units is estimated.