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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
Arbetet har omfattat ett studium av hur Cad-komponenter på NICK-format lätt skall kunna hanteras och sändas till ett Cad-system (Autocad). Första delen av rapporten är en beskrivning av NICK-formatet. Sedan följer beskrivning av Cad-komponentfilema och rekommendationer för dessa. ·Kapitel 5 handlar om tillgängliga elektroniska varuinformationssystem och innehåller en kort beskrivning av dessa. I s
The project has airned to formulate and develop a graphical experience base, the GraphCase system. The system helps the user in capturing, storing and retrieving information about building structures. Results from student work in a yearly design course were used in the Master Thesis work. Drawings were seanned and project data were input to the hypertext based system. The search routines were desi
Abstract: The report shows a possible way to determine a REI 90 wall. This is done by studies of fire safety theories, the u se of four different calculation methods, small scale tests of different wall types and finallya full scale ISO 834 test of a 3x3 metre large wall. suggestions of so me fairly possible REI 90 walls are al so included. ( Swedish )
As multi-storey buildings with wooden framework are being build, constructors are faced with problems like, for instance, deformation of the wood, that is barely noticeable in a smaller house, but significant in larger buildings. Largest deformations of the wood occur w hen wood with a high original moisture content is loaded perpendicular to the grain and simultaneous allo w ed to dry, for instan
This work is a Master' s Thesis in Civil Engineering. It has been performed in ca-operation between BODAB and the Depmtment of Civil Engineering at Lund Institute of Technology. The aim of my work has been to develop a computer based system for reaJ-estate information management that mainly utilises the drawings and documents produced during the design. The system developed uses drawings produ
The Slab-on-grade, which include Industrial floors, can be defined, according to ACI Committee 360,1 as a slab continuously supported by ground with an area of more than twice the area required to support the imposed loads. The slab may be plain or reinforced and may include stiffening elements such as ribs and hidden beams. The reinforcement may be provided for structural purpose or for the contr
This essay is a part of an extensive research project concerning multi-storey timber framed constructions in Sweden, initiated by Södra T im ber and the Department of Structural Engineering at Lund Institute ofTeclmology. The major part ofthe report is dealing with deformations in timber frames due to load and varying moisture content from an experimental point of view. It also includes a field-st
Målet med examensarbetet var att prova en samarbetsform mellan civilingenjörsutbildningen och arkitektutbildningen som innebär att engagera examensarbetare från V -sektionen i de arkitektstuderandes arbete i ritsalarna. Kontinuerligt under hösten har jag närvarat i ritsalarna och då arbetat med att försöka ge dem en bättre förståelse för byggnadens uppbyggnad och konstruktion. En förhoppning är at
The fatigue behavior of laminated veneer lumber (Douglas-fir) subjected to shearstress has been studied. The static shear strength of specimens, 37 by 102 by 406 mm was established through a three point bending test over a span of 305 mm. Four series of specimens were subjected to a cyclic load history with peak loads ranging from 95 to 80 percent of the static strength. The duration of each load
Acoustic emission is the response to the application of stress. Two sensors were attached to the setup to measure acoustic emission as a voltage. The beams were loaded until rupture in four point bending. Lab VIEW® continuously took readings of load, deflection, acoustic emission, date and time and saved all data on a hard drive.
The report includes a study where stress-laminated and nail-laminated wood decks are compared, with respect to deflection, static and dynamic springiness. The deck is built up of 22 pieces 45 mm wide, 170 mm high and 7000 mm long wood joists. (Swedish).
