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Precisering av vindlastens fördelning på en byggnad: Jämförelse av beräkningsmetodernas korrekthet
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
2016 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

The wind load represents the biggest of the horizontal loads when calculating the

stability of a building. It is important to design the building for this load so it does not

tip over. How the wind load is distributed on the stabilizing walls can be calculated in

different ways. In this report some of these methods are investigated. In those

different calculations the walls take different amount of loads depending on their

stiffness, placement or length etc. A reference house was used to appreciate which

calculation method gives the best result.

In method 1 the stiffness ratio between the floor and the walls decides how the

distribution should be made. If the floor is stiffer than the walls, case 1, the loads are

distributed to the walls depending on their stiffness. Stiffer wall means more loads.

But if the walls are stiffer than the floor, case 2, the load will distributed on the walls

like a beam on fixed supports. If the walls and the floor have relatively the same

stiffness, case 3, the load will be distributed proportionally to the section of the

facades carried by the walls.

Method 2 is a simplified method where only the length of the wall decides how much

load it will take. The longer the wall the more loads it will get.

The reference house is then put into a computer based program, FEM-Design, where

every floor in each direction is calculated one by one. This method is considered the

most correct method in this report, and therefore the results from the other

methods compared by this one to check their correctness.

The results from the reference house show that one of the ways to calculate is more

accurate than the others when compared to the model from FEM-Design. One of the

cases from method 1 seems to be the most correct way to calculate, but it is not the

same case as the one using the recommended method based on the stiffness ratio.

Furthermore, the report shows that none of these methods reflect the realistic

distribution fairly enough. They are all missing some aspect that should be into

consideration. In method 1, case 1, the distance between the point of application of

the force and the wall are not considered. And for case 2 and 3, method 1, the

properties of the walls are not taken into account in the calculation. The results show

that both the distance to the point of application of the force and the walls properties

have a big impact on the wind load distribution.

Keywords: Building stability, Wind load distribution, FEM, Stiffness ratio

Place, publisher, year, edition, pages
National Category
Building Technologies
URN: urn:nbn:se:uu:diva-297578ISRN: UTH-INGUTB-EX-B-2016/21-SEOAI: diva2:942342
Educational program
Bachelor Programme in Construction Engineering
Available from: 2016-07-01 Created: 2016-06-23 Last updated: 2016-07-01Bibliographically approved

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