Ways to optimize factory-made reinforced concrete structures based on applied methods of reliability theory

The purpose of this work is to select the areas of optimization of factory-made reinforced concrete structures based on applied methods of reliability theory, in particular probability methods. The 
criterion for the need for optimization is a significant excess of the calculated reliability indicator over the 
normative one. Research methods include probability-statistical computer modeling and field tests at the 
Bratskzhelezobeton plant. In the presented work, the results of optimization of two types of precast reinforced concrete structures were obtained: multi-cavity floor panels of the 1.141-1 series and coating beams with mixed reinforcement of the 1.462.1-1/88 series. Optimization of multi-cavity floor panels was carried out in two directions: reduction of panel thickness (h = 160 mm) and development of lightweight panels for low-rise construction; replacement of one class of tensioned reinforcement with another more high-strength, caused by industrial necessity to ensure the initial reliability of these structures. The performed studies have shown that the problem of optimizing multi-cavity floor panels is logically justified both in terms of saving resources and increasing their reliability. As a result of probabilistic calculations of beams with mixed reinforcement, the optimal amount of non-stressed working reinforcement was determined with a partial prestressing coefficient in the range of Kr = 0.65...0.75. Modeling using the developed programs proved that taking into account the nonlinearity of deformation makes it possible to more accurately identify reserves for reducing the material consumption of structures and optimize its reinforcement. 

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