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401.
Cost estimation, optimization and competitiveness of different composite floor systems
Uroš Klanšek, Stojan Kravanja, 2006, izvirni znanstveni članek

Opis: Part 2 presents the cost optimization, comparison and competitiveness between three different composite floor systems: composite beams produced from duo-symmetrical welded I sections, composite trusses formed from rolled channel sections and composite trusses made from cold formed hollow sections. In order to carry out a precise comparison between the mentioned composite systems, we applied the structural optimization method rather than classical structural analysis. The optimization was performed by the non-linear programming approach, NLP. The parametric optimization was made for simply supported beams of different spans, loads, steel costs (prices) and different hourly labour costs. An accurate cost objective function of the self-manufacturing material, power and labour costs, described in Part 1, we redefined for the optimization and subjected to the design, stress and deflection (in)equality constraints in order to satisfy the requirements of both the ultimate and the serviceability limit state. The composite structures were designed in accordance with Eurocode 4. The aim of the comparison was to define the spans and loads, at which each of the presented composite structures shows its advantages. Comparative diagrams, displayed at the end of the paper, can be usefully applied for choosing the optimal type of structure.
Objavljeno: 30.05.2012; Ogledov: 635; Prenosov: 10
URL Celotno besedilo (0,00 KB)

402.
Cost estimation, optimization and competitiveness of different composite floor systems
Uroš Klanšek, Stojan Kravanja, 2006, izvirni znanstveni članek

Opis: This paper presents self-manufacturing cost estimation, cost optimization and competitiveness of different composite floor systems: composite I beams, composite trusses produced from rolled channel sections and composite trusses made from cold formed hollow sections. Part 1 of this two-part series of papers presents the estimation of the self-manufacturing (direct production) costs for composite and steel structures. The self-manufacturing costs are proposed to be defined as the sum of the material, the power consumption and the labour costs. The material costs of the structural steel, concrete, reinforcement, the shear connectors, electrodes, the anti-corrosion, fire protection and top coat painting, the formwork floor-slab panels and gas consumption are presented in detail. The power consumption costs comprise costs of sawing the steel sections, edge grinding, drilling, welding, stud welding and vibrating the concrete. The labour costs (times) presented define the costs of metal cutting, edge grinding, preparation, assembling and tacking, welding, welding of shear connectors, steel surface preparation and protection, drilling, cutting, placing and connecting the reinforcement, concreting, consolidating and curing the concrete. New approximation functions are proposed for the calculation of some manufacturing times and material consumptions. As the discussed costs vary significantly around the world, the proposed cost expressions are given in the open form to be used for cost estimation in different economic conditions. A numerical example of the estimation of the self-manufacturing costs for a composite I beam floor system shows the suitability of the proposed approach. On the basis of the defined self-manufacturing costs, introduced in Part 1, the cost optimization and the competitiveness of different composite floor systems are discussed in Part 2.
Ključne besede: cost estimation, self-manufacturing costs, material costs, power consumption costs, labour costs, steel structures, composite structures, welded structures
Objavljeno: 30.05.2012; Ogledov: 1033; Prenosov: 9
URL Celotno besedilo (0,00 KB)

403.
Tehnični vidiki varnosti v cestnem prometu : skripta za predavanja na študijskem programu Prometno inženirstvo VS (modul Cestni promet)
Stanko Laković, 2011, učbenik za višje in visoke šole

Opis:
Objavljeno: 29.02.2012; Ogledov: 1815; Prenosov: 315
URL Celotno besedilo (0,00 KB)
Gradivo ima več datotek! Več...

404.
Gradbena mehanika III : zapiski predavanj 2010-2011
Boris Lutar, 2011, učbenik za višje in visoke šole

Ključne besede: gradbna mehanika, zapiski predavanj
Objavljeno: 22.12.2011; Ogledov: 2202; Prenosov: 268
URL Celotno besedilo (34,67 MB)

405.
Praktikum iz numeričnih metod z Mathematico
Dean Korošak, 2011, učbenik za višje in visoke šole

Ključne besede: numerične metode, univerzitetni učbeniki
Objavljeno: 06.05.2011; Ogledov: 2077; Prenosov: 85
.pdf Celotno besedilo (747,26 KB)

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