Kravchenko O. Reinforced concrete structures of coke oven battery foundation, working under the conditions of process temperatures effect.

The thesis is dedicated to the sensitive issue - creation of the technique for calculation of the reinforced concrete structures of coke oven battery foundations, working under the conditions of the process temperature effect, development and implementation of the effective design concepts. The work provides for the numerical studies of the temperature distribution in the members of civil structures making use of new national standards, harmonized with Eurocodes, which enable to conduct the calculations of the foundations of gun-type coke oven batteries with enhanced reliability. The technique for elaboration of temperature fields in the sections of foundation elements has been developed, on which basis the thermal analysis of the system "reinforced concrete waste-gas flue of underjet type coke oven battery - earth foundation" has been completed by the numerical methods. The completed thermal analysis of the foundation cross section of gun-type coke oven battery without lining as well as with lining of fireclay brickwork, for the first time detected the fact of insignificant effect of the lining on the temperature field of coke oven battery structure indicating that from the heat-engineering viewpoint it is possible to apply the heat-resistant concrete for the waste-gas flues of foundations of coke oven batteries without lining. The updated finite-element framed calculation model of gun-type coke oven battery foundation is proposed, which comprises the individual finite rod members of different height for approaching to the actual arc system. The complex of numerical experiments of strain-stress state of foundations in case of combined effect of temperature and load in case of flat and three-dimensional stress state has been performed. The special features of foundation operation have been detected, the calculation models, recommendations on improvement of the design concepts and reinforcement of their elements have been developed. The results have been received that confirm the conclusions of the heat-engineering part of analysis regarding the expediency of applying the heat-resistant concrete without lining. The technique for conducting of the experimental analyses of reinforced concrete fragments of gun-type coke oven batteries under the static load and heating. The new installation has been developed and implemented for carrying out the firing tests, as well as development prototypes simulating the full-size foundation fragments. The experimental analyses have been conducted, new data on the work of reinforced concrete structures have been received; the same enabled to improve the nature of the reinforcement, to prove the expediency of the design concepts for foundations made of heat-resistant concrete without lining of waste-gas flues. The efficient design concepts of gun-type coke oven battery foundations have been developed and implemented.