Kasem S. Bearing capacity of concrete slabs with punching shear in a fire.

The method and the numerical simulation of temperature fields in sections of concrete slabs, including pryopornyh zones on the concept of ISO harmonized with European standards group A (Eurocodes). Created calculated tables and graphs of temperature distribution for the two zones plates - with one-dimensional and two-dimensional heat flow calculations for fire resistance using computer technology for all classes normalized fire resistance 30, 60, 90, 120, 180 and 240 min. The method of determining the elastic modulus heavy concrete at high heating, the bearing capacity of concrete criteria for calculating fire resistance of reinforced concrete structures of buildings on which clarified given in Eurocode EN 1992-1-2: 2004 and EN 1994-1-2: 2005 data strength and deformation properties of concrete at elevated temperatures. The method of determining its bearing capacity of concrete to calculate fire stalezalizobetonnyh of buildings on which clarified given in Eurocode EN 1994-1-2: 2005 and ISO-N-P B V.2.6-159: 2010, data on characteristics of strength and deformation properties of concrete at elevated temperatures. A comparative analysis of numerical investigation of processes of destruction plates at bursting through the conventional and the proposed computational model in nonlinear formulation, which established a significant difference in the nature of destruction. Revealed new features of the stress-strain state of reinforced concrete monolithic buildings with bezryhelnyy framework for alternative design model that reflects the true picture of the load plate and responsible methods Eurocode 2. The technique for experimental research on concrete slabs bursting upon heating from alternative computational model. A new design of rails to install panels on trial for punching and heated, which allows for the application of the incremental loading. Experimental research bursting flat concrete and concrete slabs; established a number of new features their destruction, destruction criteria bending with axial or without axial force and push. Confirmed the feasibility of using calculations and experiments in computational models of physical №2. It is shown that the destruction of the samples can occur as a result of loss of strength in bending plates, shear plates and bursting at the simultaneous effect of these factors. To assess the state of the sample in the experiments can be used templates lines fluidity. To test the structural integrity requirements were necessary to observe the effectiveness of schemes Mitchell and Cook.