The book discusses combining timber and glass, two eco materials, with a view to developing an optimal contemporary energy-efficient house with an attractive design. Furthermore, the book connects an architectural design approach with structural research to show the possibilities of stabilizing the building with an increased size of the glazing. Research results where the glazing is considered as a load-bearing structural element are therefore presented in a manner leading to the development of an optimal model of the timber-glass house, considering both the structural and energy related aspects. The presented research work can be useful to designers and future experts in their planning of optimal energy-efficient timber buildings. The study is based on using timber and glass, which were previously neglected as construction materials. With suitable technological development and appropriate use, they are nowadays becoming essential construction materials as far as energy efficiency is concerned. However, their combined use is extremely complicated, from both the constructional point of view as well as from that of energy efficiency and sets multiple traps for designers. A good knowledge of their advantages and drawbacks is thus vitally important, which is shown in the present monograph.
COBISS.SI-ID: 17175062
This paper presents the results of research on the applicability of neural networks in the process of computer calibration of a microsimulation traffic model. VISSIM microsimulation model is used for calibration done at the example of roundabouts in an urban area. The calibration method is based on the prediction of a neural network for one traffic indicator, i.e. for the traveling time between measuring points. Besides the traveling time, the calibration process further/also involves a comparison between the modeled and measured queue parameters at the entrance to the intersection. The process of validation includes an analysis of traveling time and queue parameters on new sets of data gathered both at the modeled and at a new roundabout. A comparison of the traffic indicators measured in the field and those simulated with the calibrated and uncalibrated microsimulation traffic model provides an insight into the performance of the calibration procedure.
COBISS.SI-ID: 16930838
The model where the cracks are represented by means of internal hinges endowed with rotational springs has been shown to enable simple and effective representation of transversely-cracked slender Euler-Bernoulli beams subjected to small deflections. It, namely, provides reliable results when compared to detailed 2D and 3D models even if the basic linear moment-rotationconstitutive law is adopted. This paper extends the utilisation of this model as it presents the derivation of a closed-form stiffness matrix and a load vector for slender multi-stepped beams and beams with linearly-varying heights. The principle of virtual work allows for the simple inclusion of an arbitrary number of transverse cracks. The derived at matrix and vector define an 'exact' finite element for the utilised simplified computational model. The presented element can be implemented for analysing multi-cracked beams by using just one finite element per structural beam member. The presented expressions for a stepped-beam are not exclusively limited to this kind of height variation, as by proper discretisation an arbitrary variation of a cross-sectionćs height can be adequately modelled. The accurate displacement functions presented for both types of considered beams complete the derivations. All the presented expressions can be easily utilised for achieving computationally-efficient and truthful analyses.
COBISS.SI-ID: 16931094
The paper presents an optimal design of single-story industrial steel building structures based on the parametric mixed-integer non-linear programming (MINLP) optimization approach and Eurocode specifications. The optimal design of the structures was investigated for factors which have significant influence on the structure mass: vertical variable load on the structure, horizontal variable load, structure span, structure height, type of standard cross-sections and strength of structural steel. For this purpose, parametric MINLP optimization was performed for a number of combinations between different parameters, i.e. different values of the mentioned influence factors. The single-story steel building superstructure was generated and the MINLP optimization model developed. The objective function of the structure's mass was defined. The modified outer-approximation/equality-relaxation (OA/ER) algorithm and the three-phase MINLP strategy were used to perform the optimization. The minimal possible structure mass, the optimal topology and the optimal standard cross-sections were obtained through each individual MINLP optimization. Based on the obtained optimal results, the recommended optimal design for single-story/single-bay structures and the comparative mass diagrams were developed.
COBISS.SI-ID: 16641046
When monitoring events on a building site using a system of multiple cameras, it is necessary to establish correspondence between the acquired imaging material. The basic problem when attempting this task is the establishment of any correspondence between points located on uniform areas of the images (e.g.regions with uniform colour or texture). The basic version of our ASIFT-SH method can mainly solve such a problem. This method consists of four steps: (i) determining the initial corresponding points within the images of both views by using the ASIFT method, (ii) grouping of initial corresponding points from the first step into subsets, based on segmented regions, (iii) calculation of local homographies for a particular subset of corresponding points, and (iv) determining any correspondence between arbitrary points from a particular camera's viewpoint, by using a suitable local homography. The critical step of this method concerns segmentation. Therefore, we have introduced into our algorithm a step for adaptive adjustment, the segmented regions being remodelled so that they better meet the required coplanarity criterion. This introduced step is based on a 3D reconstruction of the initial corresponding points and a search for the minimal number of planes within the 3D space to which these points belong. Those points that belong to a particular plane, represent a newly-created subset of the initial corresponding points. The results point out that the introduction of this adaptive step into ASIFT-SH significantly improves the accuracy of corresponding points' calculation. The mean error is 1.63 times lower and the standard deviation is 2.56 times lower than by the basic version of the ASIFT-SH method.
COBISS.SI-ID: 16522774