In this study, the time history response of concrete rectangular storage tanks subjected to blast load is investigated. The importance of the modulus of subgrade reaction of the supporting soil is evaluated. The effects of soil-structure interaction were considered in estimating the various responses. The deflection and bending moments subjected to static and blast load was compared. It is concluded that the modulus of subgrade reaction has larger influence on bending moment and deflection when subjected to blast load in comparison with static load.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 18790422This paper presents the cost optimization of underground gas storage (UGS), designed from lined rock caverns (LRC). The optimization is performed by the non-linear programming (NLP) approach in different rock environments. For this purpose, the NLP optimization model OPTUGS was developed. The model comprises the cost objective function, which is subjected to geomechanical and design constraints. The optimization proposed is to be performed for the phase of the conceptual design. A numerical example at the end of the paper demonstrates the efficiency of the introduced optimization approach.
F.18 Transfer of new know-how to direct users (seminars, fora, conferences)
COBISS.SI-ID: 16358934In this paper sensitivity analysis is done for underground gas storage. Design variables which have a significant impact on deformation of steel lining and safety factors have been determined. At present study design variables are inner gas pressure, cavern depths, cavern inner diameters and thickness of the concrete wall. Finite element model of underground gas storage with four lined rock caverns was constructed. After a series of finite element analyses, with different design values, the results were used to construct three adaptive network fuzzy inference systems (ANFIS). These models are able to predict deformation of steel lining and safety factors for any selected design data. Finally, the comparison was made between the calculated and predicted values. Design optimization consists initial design of structure, finite element analysis, sensitivity analysis and optimization methods. ANFIS model based on geometric modeling and finite element analysis can be further applied in optimization algorithms.
F.14 Improvements to existing production methods and tools or processes
COBISS.SI-ID: 16112918Assessment of the stability and mechanical resistance of the high water overflow discharger is very difficult structure because of the importance of HEP Brežice. The analysis takes into account with investigations accomplished computation model and material parameters. The results of control analyze of stability and mechanical resistances are comparable with the results that were given by designer, so the design project is acceptable.
F.17 Transfer of existing technologies, know-how, methods and procedures into practice
COBISS.SI-ID: 19951126In this work thermal fatigue resistance of 1.7C, 11.2Cr, 2.0Ni, 1.2Mo steel for hot working rolls was studied using our newly developed test rig with specially prepared test samples. Tests were carried out in temperature range between 500–700 C whereas relevant characteristics related to cracks after 200, 500, 1000, and 2500 cycles were obtained. Average length of all cracks, their density, average length of five longest cracks, and relevant microstructural characteristics of tested specimens were determined. It was found that initiation of cracks is strongly related to the cracking and spalling of carbides at specimens surface layer and that cracks growth is related to the characteristics of carbides. For comparison also results for Indefinite Chilled Double Poured roll cast iron are given. Based on obtained results, possible improvements of thermal fatigue resistance of these two materials are discussed.
B.03 Paper at an international scientific conference
COBISS.SI-ID: 1716575