This study presents the discrete optimization of steel elements with two different approaches. First, the discrete optimization is performed with program MATLAB where Exhaustive Enumeration (EE) method was employed. Second, the optimization was performed with program SAP2000 using auto selection list. The approaches are compared in terms of process time and ease-of-use. The computer code for discrete optimization of simply supported laterally restrained steel beam according to Eurocode 3 is developed based on the steel sections present in the market according to the European beams tables. Laterally restrained beams are checked for resistance of cross-section to bending, resistance of cross-section to shear, resistance to shear buckling, resistance to flange-induced buckling, resistance of the web to transverse forces and deflection. Presented approaches could be applied in the design of blast load-resisting structural elements.
F.06 Development of a new product
COBISS.SI-ID: 18790166In the deep sections of the mine shaft where underground facilities should be interconnected, the design procedure still pays attention to time dependant processes and stress strain changes that influence the existing permanent mine roadways. During the progress of excavation and primary support installation in underground construction, the behaviour of highly faulted grounds in greater depths requires appropriate yielding elements. Analyses should be taken into account as well as the possibility that rock pressures could reduce the excavation profile of the mine’s permanent construction. The construction of underground facilities in highly faulted grounds leads to big radial displacements towards excavation space not only during the time of construction but also later, when the inner lining is installed. In addition to the presentation of part of the excavation and support methods in such ground conditions the calculations results showed that the installation of the yielding elements have an effect on support elements and prevent shotcrete damage during the curing stage. The calculation results of ground loads and displacements on designed supports system are presented with a three dimensional(3D) numerical geomechanical model adopted for highly faulted ground surrounding deeper complex underground structures, have shown real application in the praxis.
F.10 Improvements to an existing technological process or technology
COBISS.SI-ID: 1495903The investigations described in this paper were performed in order to determine whether the concentrations of total suspended solids (TSS) in the Drava River, Slovenia, measured indirectly with optical sensors can be used to determine the amount and particle size of the suspended solids that can settle in stagnant water. The possibility of continuous monitoring of the TSS concentrations would allow a more reliable estimate of the amount of sediment in the accumulation lake of the planned, pumped-storage, hydroelectric power plant into which the water from the Drava River will be pumped. Therefore, during a period of one year, 90 water samples were taken directly at the optical sensors. The amount of sediments and their mineral and chemical compositions were investigated, and particle size analyses were made in 15 samples. Microbiological parameters, which included a determination of the amount of phytoplankton, zooplankton, bacteria, fungi and organic debris, were investigated in all the water samples, and the temperature and pH of the water were measured at the time when the samples were collected. The comparison of the parameters examined with the TSS concentrations showed that these concentrations can serve as a very good estimate of the amount of particles settled in the standing water, as well as of their size. These correlations are clearly expressed in the cases where the amounts of phytoplankton and organic debris in the water are low.
F.15 Development of a new information system/databases
COBISS.SI-ID: 17860630With the development of information technology, the possibilities of detail geomechanical analysis with the application of numerical methods have become an indispensable design tool for underground structures in different ground. In the practical applications we often had difficulties to determine input parameters and boundary conditions. Too little awareness of the influence on analysis results of the latter can easily lead us to an incorrect interpretation of the performed analyses and consequently inappropriate input parameters for underground structure design. With the purpose to research the influences of input parameters on ground deformation and structural forces in lining results, several 2D and 3D parametric analyses with Midas GTS 2013 and Midas GTS NX have been performed. The influence of boundary conditions, mesh coarseness and initial stress on calculated movement and stresses in ground-support system has been researched. 2D and 3D modelling procedures with different elasto-plastic constitutive models have been verified on the case study of two tunnels, which were constructed in different geotechnical conditions. A comparison has been made between the results of 2D and 3D analyses by using the Mohr Coulomb and Hardening Soil model. The calculated deformation values have been compared with measurements that were carried out during construction of two road tunnels.
F.24 Improvements to existing system-wide, normative and programme solutions, and methods
COBISS.SI-ID: 1503327For the entire area of municipality of Krško the analysis of slope stability has been done. The analysis is based on publicly available geological data (MOP, Ministry of environment, ARSO – Slovenian Environment Agency etc.) and engineering – geological rock classification. Based on this a map of slope stability was produced. As a result the map is showing the maximum slope angles where the landslides start to appear.
F.16 Improvements to an existing information system/databases
COBISS.SI-ID: 1566303