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Vid nybyggnation av betongkonstruktioner ställs höga krav på livslängd och kvalitet. En starkt bidragande faktor till ökad livslängd för etongkonstruktioner är täckskiktets tjocklek. Ett stort täckskikt skyddar armeringen då det hindrar att karbonatiseringen når in till armeringen. Användandet av större täckskikt resulterar dock i svårigheter att klara dagens krav på maximalt tillåtna sprickvidder
Danogips has introduced tongued and grooved gypsum boards which can be used regardless of the distance between the studs in the framework. The goal of this thesis is to evaluate the material properties of the new gypsum product and compare it to conventional gypsum walls. Literature studies and three different experiments are carried out. The stiffness of the construction is measured by applying a
Fastighetsbeståndet byggt mellan 1940-70, med tegelfasader av skalmurstyp, har omfattande skador på grund av rostande armering och kramlor. Anledningen är att de stålsorter som användes för armering och infästning inte var korrosionsbeständiga fram till 1980-talet. Initialt uppträder problemen över öppningar där armering finns i det understa tegelskiftet. Då täckskiktet är otillräckligt börjar stå
Peab har utvecklat vägbyggnadskonceptet SwePave för att optimera olika överbyggnadskonstruktioner med bland annat stabiliserat packat material. Denna metod går även att använda för att stabilisera jorden förgrundläggning av nya byggnader. Där stabiliserat material använts för att förstärka jorden behövs även en metod för att förstärka för de punktlaster som nedförs av stomkonstruktioner. För att f
A progressive collapse implies a structural failure initiated by a local damage which subsequently develops, as a chain reaction, into a failure of either the entire structural system, or only a part of it. The collapse of the Ronan Point building in London 1968 prompted numerous efforts to develop structural design criteria to prevent progressive collapse. Improved design procedures with the inte
There are many ways to construct a building. The designing team, structural engineers and architects, works together to find the best possible solution that will fulfill the owner’s whishes. In this process a structural system needs to be chosen. There are many factors that affect the selection of the structural system, but generally the most economical system is chosen. The factors that need to
In the 1940-ies curtain walls were introduced, i.e. brick walls that do not have any bearing function but served as a front material. Horizontal reinforcement was used in this kind of walls, partly over and under openings or, in undisturbed wall fields, every 5-6th bed joint. In this work the tensile bond strength of mortar joints repaired with an injection tool and a manual method respectively is
In this master’s thesis automatic generation of reinforcement distribution in the structural engineering program FEM-Design Plate was investigated. The reinforcement distribution proposed was to be as accurate as possible, both from a theoretical and a practical point of view. For this purpose, calculation routines considering current national codes and engineering practice have been developed. Th
In this master thesis, the properties of shell bedded autoclaved aerated concrete (AAC) are investigated. There are reasons to believe that the values for flexural, compressive and shear strength in the Swedish regulations are on the low side. The work within this master thesis consists of determining the characteristic values based on experimental tests. The test results indicate that the values
Modulenthus bygger småhus enligt principen volymhus, det vill säga att så mycket som möjligt färdigställs på fabrik så att huset kan levereras direkt till byggplatsen som ett antal volymer med golv, väggar och tak. Husen ställs på en krypgrund, en typ av grund som alltid blivit kraftigt ifrågasatt och på senare år uppmärksammad i media på grund av den stora andelen fuktskadade grunder. För att lig
Modulenthus bygger sina hus enligt volymprincipen, vilket innebär att de olika elementen till stommen byggs på olika linjer inne i en husfabrik. Dessa element sammanfogas sedan till större volymer. När volymerna står färdiga kan fönster och dörrar börja monteras och det invändiga arbetet såsom kakling av badrum och iordningställande av kök påbörjas. De inplastade volymerna transporteras sedan ut t
Sustainable Bridges is an EU-project. The objective of the project is to demonstrate that it is possible to enhance the load capacity of a bridge with refined analytical methods. This thesis will be a small part of the project. My objective in this thesis is to examine the dynamic loads generated in a bridge when trafficked. Since there are uncertainties concerning the dynamic effect this variable
This Masters Thesis’ purpose is to evaluate a number of methods used for dimensioning in order to avoid unwanted sway and vibrations in a light weight steel floor structure. The design methods studied in this report are done by Ohlsson, Hu, Onysko, Talja and ISO (no calculations or measurments are made for ISO). The study shows that there is no big difference in the longest span allowed by the stu
In the period between 1940s and 1970s the widespread practice in Sweden was to use non-stainless steel reinforcement in masonry walls. In many cases cracks started to appear in joints above openings in these walls because of corrosion of the reinforcement. The largest problem is that the appearance of damaged buildings deteriorates and there is a risk of bricks falling down and rain water penetrat
This Master’s Thesis investigates whether expansion joints should be placed between fields of ceramic tiles, which are recommended by distributors today. This thesis concludes that expansion joints do not relieve in-plane stresses in ceramic tile coverings attached with the thin-set method. As shear stresses in the adhesive layer in the vicinity of expansion joints can reach critical levels, using
When designing concrete structures, there are great demands made on quality and service life of the construction, and for this the size of concrete cover is crucial. The concrete cover protects the reinforcement bars from carburization and from infiltration of chlorides, which make them corrode. When using today’s codes while designing, a thick concrete cover will yield a large crack width, which
Analysis and design of a frame can be done in two principally different ways. The first method, calculation according to first order elastic theory, is based on buckling lengthsand interaction relations. The advantage with this method is its simplicity. The difficulty lies in the determination of buckling lengths. The second method, calculation according to second order elastic theory, results in
This report shows how an non-insulated sheet metal roof behaves when it is exposed to varying temperatures. What happens is that the sheet metal expands and contracts which can lead to damages in the sheet metal fasteners. This causes problems when the roof is ment to stabilize for horisontal forces on the building. This report focuses on a specific construction type that is the most commun in the
The wind effects on high rise buildings were studied by finding and reading books, articles and studying equations. This was done to calculate the first natural frequency of high rise buildings, wind induced acceleration on high rise buildings and how the comfort criteria of acceleration performing on high rise buildings acts on human bodies living in the building. The buildings that were studied
