Dimenzioniranje sestavljenih lesenih stebrov

diplomska naloga

Alja Puš (Author), Jože Lopatič (Mentor), Drago Saje (Co-mentor), Drago Saje (Co-mentor)

Abstract

Analiziramo napetostno stanje sestavljenih lesenih stebrov po standardu za projektiranje lesenih konstrukcij SIST EN 1995-1-1. Stebri so členkasto podprti na obeh koncih, posamezni elementi stebra pa potekajo neprekinjeno po vsej dolžini. Prerezi v centrično tlačenih stebrih morajo biti simetrični, zato se tlačne napetosti po celotnem prerezu ne spreminjajo. Program, izdelan v orodju Microsoft Excel, omogoča izbiro škatlastega in »I« prereza, ki sta pri dimenzioniranju sestavljenih stebrov najbolj pogosta in učinkovita. Nosilnost stebra je odvisna predvsem od njegove relativne vitkosti in togosti povezave med lesenimi elementi, ki jo zagotavljajo vezna sredstva. Lastnosti sestavljenega stebra zajamemo z nadomestno upogibno togostjo prereza in modulom pomika veznega sredstva. Strižni priključki so tipa les – les in imajo eno strižno ravnino v kateri se pri obremenitvi pojavijo strižne napetosti, katere prevzamejo žeblji prek svoje strižne odpornosti. Vezna sredstva si izberemo na podlagi vrste lesa, dimenzij prereza in velikosti obremenitve, ki jo morajo vezna sredstva prevzeti. Na podlagi podane geometrije elementa, izbrane vrste lesa, trajanja in velikosti obtežbe ter vrste veznih sredstev preverjamo nosilnost elementov glede uklona stebra in nosilnosti veznih sredstev. Program poda rezultate analize izbranega stebra ločeno za oba pogoja nosilnosti, tako da lahko uporabnik popravi samo tiste parametre, ki ne izpolnjujejo določene kontrole.

Keywords

gradbeništvo;diplomska dela;UNI;B-GR;lesene konstrukcije;napetostno stanje;

Data

Language:	Slovenian
Year of publishing:	2015
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[A. Puš]
UDC:	624.011.1:624.07(043.2)
COBISS:	7256417
Views:	2394
Downloads:	598
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Design of built - up timber columns
Secondary abstract:	We analyse the stress state of built – up timber columns by the standard for the design of timber structures SIST EN 1995-1-1. Columns are pin jointed at both ends. The cross - sections in a centrically compressed columns should be symmetrical so that the compressive stress over the entire section does not change. The computer program, created with the tool Microsoft Excel, allows the selection of the “boxed” and "I" section, which are the most common and effective for dimensioning built - up columns. The load capacity of a column mainly depends on its relative slenderness and rigidity of the connection between wooden elements, provided by the mechanical fasteners. Properties of the built -up column are captured by the effective bending stiffness and the slip modulus of mechanical fasteners. Shear connectors are wood - wood type and have one shear plane in which, when load is applied, the shear stress occurs. This shear stress is taken by the nails through their shear resistance. Fasteners are selected based on the type of wood, the cross - section dimensions and size of the load that fasteners have to bear. Based on the given geometry of the element, selected wood species, the applied time and size of load, the carrying capacity of elements, regarding column buckling and fasteners carrying capacity is checked. The program gives the results of the analysis of the selected column, separately for both load conditions, so that the user can correct only those parameters that do not meet certain conditions of the controls.
Secondary keywords:	graduation thesis;civil engineering;composite timber columns;buckling resistance;
File type:	application/pdf
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	X, 21 str.
ID:	9057141