diplomska naloga
Povzetek
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.
Ključne besede
gradbeništvo;diplomska dela;UNI;B-GR;lesene konstrukcije;napetostno stanje;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2015 |
Tipologija: |
2.11 - Diplomsko delo |
Organizacija: |
UL FGG - Fakulteta za gradbeništvo in geodezijo |
Založnik: |
[A. Puš] |
UDK: |
624.011.1:624.07(043.2) |
COBISS: |
7256417
|
Št. ogledov: |
2394 |
Št. prenosov: |
598 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Design of built - up timber columns |
Sekundarni povzetek: |
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. |
Sekundarne ključne besede: |
graduation thesis;civil engineering;composite timber columns;buckling resistance; |
Vrsta datoteke: |
application/pdf |
Vrsta dela (COBISS): |
Diplomsko delo/naloga |
Komentar na gradivo: |
Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo |
Strani: |
X, 21 str. |
ID: |
9057141 |