The Analysis of Bearing Capacity of Axially Compressed Cold Formed Steel Members

This paper presents a calculation method for axially compressed cold formed stainless, high strength and carbon steel profiles. Results of different authors in this field published in international journals depict current trends in this field. Paper also presents author’s numerical and experimental analysis of cold-formed centrally compressed elements. Numerical analysis was carried out by finite element method and program for the nonlinear static and dynamic structural analysis - PAK. The results obtained by experimental and numerical methods included boundary conditions, maximum force, buckling curve etc. Small difference observed in the values obtained by these different methods. Results werw compared to values predicted by international designing code in order to analyze if they are too conservative for cold formed steel sections

Analiza dinamičkih obilježja i krutosti pri savijanju podnih ploča od križno lameliranog drva provedena metodom konačnih elemenata

The aim of this paper is to present numerical investigations of dynamic characteristics and bending stiffness for cross laminated timber floor panels with and without service openings. Five-layer panels with the outer layers oriented in the longitudinal direction of the panel have been analyzed. In order to explore the full potential of this floor system using a limited number of measurements and structural tests, models based on the finite element method have been proposed, validated against experimental results and then used to investigate the effect of opening position in the floor on main structural performance parameters. The results showed that, when the need for additional service opening appears, a slight decrease of the main structural characteristics of the cross laminated timber floor panels is achievable with an adequate geometrical position of the opening in the floor.Cilj ovog rada jest prikaz numeričkog modela dinamičkih obilježja i krutosti pri savijanju podnih ploča od križno lameliranog drva (CLT) sa servisnim otvorom i bez njega. Analizirane su peteroslojne ploče s vanjskim slojevima orijentiranim u uzdužnom smjeru ploče. Kako bi se uz pomoć ograničenog broja mjerenja i mehaničkih ispitivanja istražio puni potencijal takvoga podnog sustava, predloženi su modeli utemeljeni na metodi konačnih elemenata koji su validirani u usporedbi s eksperimentalnim rezultatima te primijenjeni za istraživanje utjecaja položaja otvora u podu na glavne parametre ponašanja konstrukcije. Rezultati su pokazali da se odgovarajućim pozicioniranjem naknadnog otvora u podu može postići vrlo malo smanjenje glavnih mehaničkih svojstava podnih ploča od CLT-a

Reinforcement of steel cylindrical silo due to repurpose of technology and loading

During the exploitation of the steel cylindrical silo there was a repurpose of construction that required the need for creating a revision on the lower part of the silo. In addition, due to the change in the type of material stored in the silo, the load was increased. An analysis of all relevant impacts has begun to determine the actual stress and strain state on the structure. The construction is modelled in the Abaqus software package. Based on static influence, the necessary reinforcements are foreseen and the construction is dimensioned according to European regulations - Eurocodes

Dynamic characteristics of CLT panels: Computer modelling and simulations

The fundamental vibration frequency and deflections due to the unit static force of the cross-laminated timber panels of different heights and spans were calculated. The calculation of the effective flexural rigidity was performed by the Gamma method. Obtained values are compared with the values obtained by modeling the construction in the Ansys software package. Three types of floor panels were analyzed with the same combinations of layer thicknesses in the cross section, but with different number of layers. The panels are 4, 5 and 6 meters long and 1 meter wide. Based on the results, recommendations have been made in accordance with current criteria that define the acceptable behavior of lightweight floor structures in relation to vibrations caused by human action

Calculation of steel antenna mast according to Eurocode

The paper presents the calculation of steel antenna mast according to Eurocode with the aim of testing the mast utilization for the needs upgrading new network for mobile telephony. A mast is made of four segments with connections and the lower two segments are with variable cross-section. At the highest segment are placed two platforms with carriers for antennas and mobile technology. It presents the analysis of the loads according to the German standards DIN to compare with the Eurocode

Design of aluminum structures for semistructural facades according to Eurocode-9

This paper presents principles of design-calculation of aluminum structures that carry semi structural glass facades of high rise buildings according to Eurocode-9. For the purpose of construction of A and B buildings of the Unit-1in the Block 26, Novi Beograd, an extensive analysis of wind load and vertical load of the facade has been conducted. Bearing structure of the facade is designed in the form of a mesh of vertical and horizontal aluminum girders (l=1.2m and l=2.4m), following the architectural demands. In this case, chosen aluminum profiles were SCHUCO, type FW 50*. Buildings A and B, Unit-1, have ground floor, six stories, retracted story and technical story, with total height of 37.96m. Vertical and wind load analysis was conducted according to current SRPS codes that deal with wind load effect on large stiff buildings with special attention to wind loads in area III (a part between buildings A and B). Static calculation of the facade was performed according to the ultimate limit state as described within Eurocode-9: EN 1999-1-1: 2007- British Code for Aluminum structures

Load analysis of transmission lattice steel tower according with the European Standards

The paper presents the load analysis of transmission suspension tower with a voltage of 110kV according with the European Standards. Considering the specificity of the loads acting on the overhead suspension tower great effort must be paid to the analysis of the loads and load cases adoption. The structure analysed is a lattice steel tower of height 41,50m with three pairs of crossarm. Thereafter, presents and discusses the comparison of the results obtained by European standards with the results obtained by Yugoslav standards

Analysis of the bearing capacity of the composite column as the function of the base material

The paper presents the results of the experimental-theoretical model research of the composite concrete-steel columns. Columns were formed from steel tubes with concrete core. Ultimate load bearing capacities were determined by applying Euro code 4 guidelines while varying mechanical properties of the basic materials

Restoration, adaptation and upgrading of the existing building in Belgrade, Tabanovacka street no. 3

Due to the change of object's purpose a project for rehabilitation, reconstruction of the existing building was made. Project also included additional new part of the building. Building have ground level, first floor and attic. The new function of building requires the removal of three central reinforced concrete pillars. The project analyzed several alternative methods of rehabilitation. Due to the increasing load on the existing pillars, it was necessary to strengthened them. In addition to the pillars, it was also necessary to strengthen the foundations. The project for a new part of the building included a laminated timber structure. The project also planned a construction of a gallery as a new functional area

Design steel spherical tank height H = 44m according to Eurocode

This paper presents the design of the steel water tower with spherical water tank height H = 44m. Spherical tank is located at the top of the steel tubular column, with diameter F = 128cm. The construction of the water tower was modeled using the ABAQUS software package, to give a realistic picture of the stress-strain states in all points of the tank shell and the tubular column. Analysis of the load of construction was carried out based on European standards, with special attention to the influence of the earthquake on the spherical tank