Contribution to calculation and construction of cold-formed open cross sections

Pod nazivom hladno oblikovani profili (HOP) podrazumevaju se konstruktivni element! proizvedeni hladnim oblikovanjem iz čeličnih limova i traka valjanjem ili presovanjem . Hladno oblikovani profili imaju veoma široko polje primene u g rad jevinarstvu i poslednjih godina su u nekim područjima primene potpuno istisli vru će valjane profile zbog svojih nesumljivih prednosti. Rožnjače, kao element noseće konstrukcije zgrada, za koje se najčešće i primenjuju hiadno oblikovani ^profili otvorenog poprečnog preseka, su bitan element u funkcional- nom, statičkom pa i u ekonomskom pogledu s obzirom da njihov udeo u ceni koštanja hala doseže i do 25%. Pristup analizi u projektovanju masovnih eleme- nata ko nstrukcije, kao što su rožnjače, je bitno različit od pristupa pri pro­ jektovanju unikatnih elemenata. Kod masovne, serijske, proizvodnje neophodno je sve parametre od uticaja uzeti u što preciznijem obliku, što je jedino mogu- će ostvariti eksperimentom. U okviru ove disertacije razmatrana su dva bitna parametra na nosivost rožnjača i to: 1) uticaj tehnologije proizvodnje na me- haničke karakteristike čeiika i 2) odredjivanje optimalnog statičkog sistema (kontinualne rožnjače sa podvezicama i kontinualne rožnjače sa preklapanjem) i konstrukcijskog oblikovanja. U okviru ovih oblasti u tezi su date originalne podloge u obliku pojednostavljenih i za svakodnevnu inženjersku praksu lako p rihvatljivih analitičkih izraza i dijagrama na osnovu kojih se mogu projektova- ti ovakvi savremeni sistemi rožnjača. Svi analitički izrazi su verifikovani sop- stvenim eksperimentima sprovedenim uz primenu najsavremenije opreme i mer- nog instrum entarija. Takodje je sprovedena i detaljna tehno-ekonomska analiza više tipova rožnjača diferenciranih prema sistemima, oblicima i postupku proiz­ vodnje koja je pokazala značajno preimućstvo u pogledu utroška čelika i košta- nja predloženih Z preseka sistema rožnjača sa podvezicama i sa preklapanjem u odnosu na sve druge tipove primenjivane u dosadašnjoj p raksi

Design of class 4 cross section in axial compression according to EUROCODE 3

In this paper theoretic basis of design of class 4 cross section in axial compression according to EN1993-1-5 is given. Design procedure is given as an flow chart and ilustrated with an worked example. Plate buckling is treated localy and globaly through the concept of effective cross sections. Interaction between plate-like and column-like behaviour of panels is carried out thought buckling reduction factors and final effective area of cross section

Wind towers - design of flange ring connection

Today, wind power is second largest available renewable resource of energy, with 870 TW (terawatts). Large wind farms, with hundreds of wind towers are big opportunity for steel production industry. Designers and manufacturers of wind towers pay special attention on every single detail, always looking for some new solutions, trying to reduce price of wind towers. Some of the most interesting design and manufacturing details are connections used to assemble sections of tubular steel towers supporting wind turbins. There is traditional and actually more used flange ring connection and on the other side, as a new proposal which is used more and more, friction connection. In this paper theoretic basis of design of flange ring connection of wind towers is give

Design of class 4 cross section in axial compression according to EUROCODE 3

In this paper theoretic basis of design of class 4 cross section in axial compression according to EN1993-1-5 is given. Design procedure is given as an flow chart and ilustrated with an worked example. Plate buckling is treated localy and globaly through the concept of effective cross sections. Interaction between plate-like and column-like behaviour of panels is carried out thought buckling reduction factors and final effective area of cross section

Wind towers - design of flange ring connection

Today, wind power is second largest available renewable resource of energy, with 870 TW (terawatts). Large wind farms, with hundreds of wind towers are big opportunity for steel production industry. Designers and manufacturers of wind towers pay special attention on every single detail, always looking for some new solutions, trying to reduce price of wind towers. Some of the most interesting design and manufacturing details are connections used to assemble sections of tubular steel towers supporting wind turbins. There is traditional and actually more used flange ring connection and on the other side, as a new proposal which is used more and more, friction connection. In this paper theoretic basis of design of flange ring connection of wind towers is give

Čelična konstrukcija sinemapleksa ''STER'' u tržnom centru ''Delta City'' u Beogradu

This paper represents steel structure of the cinema »Ster« which is a part of the shopping mall Delta City in Belgrade. Cinema has six projection rooms with additional contents. There are three levels of structure: main bearing structure, structure of projection rooms and raised floors, gross weight approximately 600 t. All steel columns are free suported. Vertical and roof bracings and stiff composite floors provide stability of structure. Due to complex roof geometry and building particularity, special attentione had to be paid to designing of joints, production of workshop drawings (software for 3D modeling was used) and planning erection tehnology

Stainless steel cross-section resistance according to continuous strength method

Continuous strength method is a contemporary approach to calculation of resistance of stainless steel cross-sections which has been recently developed at the Imperial College of London. The basis of the method is the continuous relation between the slenderness and strain capacity of a cross-section, nonlinear relation between the stress and strain and the strengthening effects of cold forming. In the paper are presented the fundamental rules for calculation of cross-section resistance according to continuous strength method; the comparative analysis of design resistance of the compressed cross-section was conducted through a numerical example according to this method and EN 1993-1-4

Stainless steel cross-section resistance according to continuous strength method

Continuous strength method is a contemporary approach to calculation of resistance of stainless steel cross-sections which has been recently developed at the Imperial College of London. The basis of the method is the continuous relation between the slenderness and strain capacity of a cross-section, nonlinear relation between the stress and strain and the strengthening effects of cold forming. In the paper are presented the fundamental rules for calculation of cross-section resistance according to continuous strength method; the comparative analysis of design resistance of the compressed cross-section was conducted through a numerical example according to this method and EN 1993-1-4

Primer primene akustičke izolacije u čeličnoj konstrukciji sinemapleksa ''STER'' u Beogradu

Modern public buildings, such as multiplex cinemas, along with application of state of the art sound effects brings high acoustic isolation demands. Cinemas are often a part of building complexes such as shopping malls with subjects that produce serious level of noise and vibrations. Usage of modern materials, with specific dynamic characteristics, as a base for supports gives a wide range of possibilities in controlling the amount of noise and vibrations transferred to the structure. This paper gives an example of usage of acoustic pads in steel structure of “Ster” cinemaplex in Belgrade

Čelična konstrukcija sinemapleksa ''STER'' u tržnom centru ''Delta City'' u Beogradu

This paper represents steel structure of the cinema »Ster« which is a part of the shopping mall Delta City in Belgrade. Cinema has six projection rooms with additional contents. There are three levels of structure: main bearing structure, structure of projection rooms and raised floors, gross weight approximately 600 t. All steel columns are free suported. Vertical and roof bracings and stiff composite floors provide stability of structure. Due to complex roof geometry and building particularity, special attentione had to be paid to designing of joints, production of workshop drawings (software for 3D modeling was used) and planning erection tehnology