The paper describes detailed structure of the integral automated regulation system for the control of indoor environment (ICsIE) which harmonises occupant comfort requirements and principles of bioclimatic approach. The ICsIE regulates indoor illumination, thermal conditions and air quality. The control unit of the system is designed as a hybrid cascade system incorporating fuzzy logic and conventional PI controllers. Regulation is executed with the use of sensors, which monitor the environmental conditions and adherent actuators. The ICsIE is currently installed in an occupied office in the building of the Faculty of Civil and Geodetic Engineering, University of Ljubljana, Slovenia. During the operation the ICsIE was able to synchronise the aspects of thermal, illuminance and ventilation control and maintain indoor environmental conditions in the desired range of the set-point values.
COBISS.SI-ID: 5442145
Hospitals present complex indoor environment with various users, health hazards and specific activities. This paper classifies health hazards specific to the hospital environment (HE), defines their interactions and possible impacts on human health and summarizes recommendations for biological and chemical hazards. A detailed literature review clearly shows that there is no developed system or method for integral control of health hazards in HE. There is no appropriate technology available that would allow development of optimal thermal comfort conditions for individual users in HE. For integral control of physical hazards, an innovative low exergy (LowEx) system was designed and tested. The system enables individual control of thermal comfort parameters to meet the needs of various users in the same room. The system application is presented in a model room for burn patient. Owning to its flexibility, the system can also be used for other potential users.
COBISS.SI-ID: 5988705
The paper deals with a numerical investigation of the out-of-plane buckling behaviour of freestanding roller bent steel arches. At roller bent elements the distribution of residual stresses differs very much from the distribution for straight hot rolled or welded elements. The accuracy of the numerical model is checked in comparison to test results and was confirmed. An extensive numerical analysis provided data on ultimate resistance of freestanding roller bent arches. Based on the analysis of obtained results the imperfection parameters were determined and standard European buckling curves can then be defined for calculating the resistance of arches.
COBISS.SI-ID: 5907297
The paper deals with buckling interaction of longitudinally stiffened steel panels subjected to large bending moments and large shear forces. The results of tests and numerical simulations are given and a comparison to European standard EN 1993-1-5 that covers plated structures is commented into detail.
COBISS.SI-ID: 5904993
The paper presents the influence of strain localization and concrete softening on the FE analysis of an RC frame in fire conditions. Based on the results of the mechanical response analysis of the RC two-floor planar frame we established that during fire the strains localize at certain places in the frame. There appear unusual strain oscillation along finite elements and numerical blocking. Moreover, the results also depend on the finite element mesh. Thus, a crack-band element of limited length is built into the numerical model for the mechanical analysis. With crack-band model researchers successfully model the concrete softening and the strain localization at room temperature in tension as well as in compression. The model considers the experimental finding that concrete strains do not localize into a point but into a region of limited length. It proves that the mentioned model is proper also for the mechanical response analysis of the RC frame under elevated temperatures, when the concrete softening and the strain localization appear. It is established that the length of the crack-band model significantly affects the calculated fire resistance of the RC frame structure
COBISS.SI-ID: 5905761