Filetype
Syftet med detta examensarbete var att först kortfattat beskriva uppkomsten av egenspänningar i massiva betongkonstruktioner. Dessa spänningar är orsakade av bl a tvång, temperaturhöjningar samt efterföljande temperaturminskningar. Den huvudsakliga uppgiften var att beskriva en teoretisk modell för att beräkna spänningar i ung betong. Denna modell bygger på Hooke's lag, dvs ett linjärt samband
This paper deals with 3-pinned frames of laminated veneer lumber. The fixed knees are made of plywood- or steelgussets. The design proeecture in accordance with the Swedish building code, "Nybyggnadsregler" is described. A number of practical experiments have been performed to check the stiffness and strength off the knee. The economy for this type of construction campared with glued lam
Uppsatsen beskriver limförbands beteende i icke bärande väggar uppbyggda av gipsskivor som limmas på stålreglar.
We have searched for different possibilities to introduce Multimedia at a welding company in Argentina. We decided to create a training system. Our system should teach an unskilled user how to use a rather camplex expert system for welding. In this paper we discuss the design and implementation of a multimedia training system. We also include an evaluatlon of the software tools used in this projec
Longterm tests of two different adhesives have been performed. Three different test methods were used to determine the ageing performance of adhesive bands. One set of specimens was subjected to eyelic accelerated ageing and testedfor shear strength after different numbers of cycles. Another set has been exposed to the same ageing procedure, but with eonstantshear stress to determine creep deforma
A wooden frame system for non-bearing interior walls has been developed. The wall consists of studs, spaced at a regular interval of 900 mm, forming a frame together with the bottom and top p1ate. The framework is sheathed with gypsum plasterboards. The system is developed and adjusted for the purpose of fixing the gypsum plasterboards with glue. A special investigation of the mechanical behaviour
Board, made of wood based raw material, is used for structural purposes with increasing frequency in light construction techniques. Therefore, it is of great importance that both producers and users understand how the material behaves under longterm leading and elirnatic exposure. A comparative study is made of longterm load indurced detleetians of various board materials, such as fibre board, par
Denna uppsats behandlar genomstansningsbrott hos betongplattor och bygger till största delen på litteraturstudier. Den centrala delen av uppsatsen är en järnförande studie av sju europeiska byggnormer, däribland den svenska. Uppsatsen beskriver dokumenterade forskningsresultat och de brotteorier som dessa lett fram till. Vidare beskrivs de modeller som ligger till grund för de studerade normerna.
Use of glassfibercomposites as prestressed reinforcement in concrete railroad sleepers subjected to fatigue loading has been studied. Mechanical material parameters for a certain glassfibercomposite has been determined. Transferlength and anchorage problems have been analysed.
Examensarbetet innehåller en studie av bärande träregelväggar. Bärförmågan har optimerats för en given belastning. Väggen belastas med vertikala punktlaster, från takstolarna, i sin överkant.
The u se of fiber compos i tes in concrete structures is an alternative to conventional steel remforcement and several structures employing fiber composites have already been built in Japan, Europe and USA. Fiber composites offer high strength, high durability and low weight. Another property is high elastic elongation which is an advantage in structures acting under impact load. Part I of this re
The dynamic and static E-modulus of the concrete at very early ages (a few hours after casting) has been determined and the results has been compared. The dynamic modulus has been determined for 40x40x160 mm specimens with the resonance frequency method and the static E-modulus has been determined for cylinder specimens 0 l 00x200 mm with the stress strain method.
The report presents testresults from a research project conceming fatigue of reinforced normal and high strength concrete beams (0.3 x 0.4 x 6.0 m). The beams were designed to have the san1e flexural and shear capacity at a point 1.5 m from the support. Two beams of each sort were tested statically to failure, and four beams of each sort were tested with a fatigue load. The fatigue load varied bet
