Calculation Of Reinforced Concrete Slabs On Yielding Supports Under Short-term Dynamic Loading

Buildings and structures used for industrial and civil purposes are exposed to dynamic impacts of emergency nature. To protection of structures one should improve methods for dynamic analysis of structures and also elaborate effective design solutions that ensure structural reliability under intensive dynamic impacts. The given paper considers the multi-layer deformation model for concrete beams; calculation method for 2-way reinforced concrete slabs was elaborated on its basis. In regards to structural solutions, application of yielding supports provides the increasing structural resistance towards dynamic loads of large intensity. The yielding supports are presented as deformable elements of ring cross-section which are characterized by three phases of deformation: elastic, elasto-plastic and hardening phase. The numerical study allowed to evaluate the influence of yielding supports stiffness in plastic phase of deformation on the work of reinforced concrete slabs, as well as the effect of the nature of stiffness distribution along the perimeter of the slab and the deformation level of yielding supports at the moment of transition to the plastic phase deformation. Resulting from the calculations physical and mechanical parameters of supports were defined allowing getting the maximum effect in decrease of the stress-strain state of the structure.