Krasnova K. Systems of pedestrian bridge frameworks with rational parameters

The thesis is devoted to research and development of new type pedestrian bridge steel-ferroconcrete frameworks invented on the basis of rationalization method application and parameter management. On the basis of specially developed modification of straightforward design method surmising iterated definition of control factors (external and internal) new design solutions are formed for pedestrian bridge frameworks in total and their particular elements aimed to ensure optimal resistance to operational loads and minimize resource consumption. In its turn, the proposed and substantiated structure formation methodology with preselected positive properties is tested by application of imitation approach on the basis of constructed final elements model. Within its frames components of mode of deformation were estimated and strain potential energy density distribution studied in structure formation of pedestrian bridge framework beam and arch systems. On the basis of prepared requirements, step by step a rational design solution has been obtained for pedestrian bridge framework systems where positive properties of concrete and steel are exploited in the best mode. Representativeness of postulated approach and efficiency of formed design solutions for pedestrian bridge frameworks were tested by experimental research on a field representative sample of framework subjected to instantaneous low-cycle and continuous loads. Experimental data were analyzed and juxtaposed with the results of theoretical calculation. Results of research were implemented in engineering and construction practice, their feasibility as well as efficiency of basic solutions was confirmed.