Med den rådande befolkningsökningen tyder prognosen över bostadsförsörjningen att de behövs byggas fler bostäder för att uppfylla bostadsbehovet. Byggnadsbranschen står idag för cirka 20 % utav det totala koldioxidutsläppen i Sverige. Av detta skäl finns det ett behov att utveckla mer miljövänligare och hållbara tekniker för att uppfylla de ställda kraven gällande hållbart byggande. Trä och konstruerade träprodukter anses vara ett miljövänligt material och bör användas som stommaterial i byggnader i större utsträckning än det görs idag.    Detta arbete innefattar att jämföra de strukturella prestanda hos limträbalkar och armerade betongbalkar i flervåningsbyggnad. Som startpunkt modelleras en befintlig byggnad utifrån de dokument som tillhandhålls av ritningar och andra anvisningar för den avsedda referensbyggnaden. Bärverksanalysen utfördes i FEM-design till syfte att kontrollera limträbalkar beteende i nedböjning, spänning, tvärsnittsmått och bärighet. Arbetet genomfördes i två steg, referens byggnadens betongkonstruktion modelleras noggrant i första steget. I det andra steget ersätts armerade betongbalkar av limträbalkar i syfte att jämföra deras strukturella prestanda.     Det erhållna visar att limträets lätta vikt medför en minskning på ca 24 % på byggnadens totalvikt. Styvhetsegenskaper är limträbalkar största nackdel jämfört med armerad betongbalk, eftersom ett utbytte av balkarna med liknande dimension i 8 m spännvidd gav upphov till ca 65 % ökning på deformationer. Vid användning av limträbalkar ska spännvidden på 8 m halveras, samt större limträtvärsnitt och pelare placeras ut för att uppfylla det ställda kraven gällande bruks-och brottgränstillståndet. / With the prevailing population increase, the forecast of housing supply indicates that more housing needs to be built to meet the housing need. The construction industry today accounts for about 20% of the total carbon dioxide emissions in Sweden. For this reason, there is a need to develop more environmentally friendly and sustainable technologies to meet the set requirements regarding sustainable construction. Wood and constructed wood products are considered an environmentally friendly material and should be used as frame materials for buildings to a greater extent than is done today.   This work includes comparing the structural performance of glulam beams and reinforced concrete beams in multi-story building. As a starting point, an existing building is modeled on the basis of the documents provided by drawings and other instructions for the intended reference building. The structural analysis was performed in FEM design for the purpose of checking the behavior of glulam beams in deflection, stress, cross-sectional dimensions and load-bearing capacity. The work was carried out in two stages, the reference building's reinforced concrete structure is carefully modeled in the first stage. In the second stage, reinforced concrete beams are replaced by glulam beams in order to compare their structural performance.   The results show that the light weight of glulam leads to a reduction of about 24% in the total weight of the building. Rigidity properties are the biggest disadvantages of glulam beams compared to reinforced concrete beams, since a replacement of the beams with a similar dimension in 8 m span gave rise to about 65% increase in deformations. When using glulam beams, the span of 8 m must be halved, and larger glulam cross-sections and columns must be placed to meet the set requirements regarding serviceability and ultimate limit states.

<p>The present study examines a new production line of glue-laminated wood (glulam). </p><p>The glulam is produced from non-planed boards of spruce, which also is convex, that is pressed together with high pressure during the gluing. According to a economic calculation, the material has a economical potential mainly on account of the absent planning. </p><p>The study mainly found out that the shear strength of the material tolerated the demanded values in standard SS-EN 386, but the delaminating values did not. Since there are more areas to be studied around the material, the prospect to achieve the right delamination values is seen as positive.</p>

The present study examines a new production line of glue-laminated wood (glulam). The glulam is produced from non-planed boards of spruce, which also is convex, that is pressed together with high pressure during the gluing. According to a economic calculation, the material has a economical potential mainly on account of the absent planning. The study mainly found out that the shear strength of the material tolerated the demanded values in standard SS-EN 386, but the delaminating values did not. Since there are more areas to be studied around the material, the prospect to achieve the right delamination values is seen as positive.

Approximately one fifth of Sweden’s total emissions of greenhouse gases originate from the construction and real estate sector. In order to minimize the climate footprint in the construction industries, the endeavor is to use as environmentally friendly and sustainable processes and materials as possible. Thus has wooden structures had a recent upsurge where generally more buildings are constructed by wooden materials.  Glulam is often used where the requirements regarding a materials strength is high. Glulam beams are a suitable option as loadbearing constructions in framing of joists. Piercing is frequently required in framing of joists as a result of needed space for ventilation ducts and drain pipes. There is no formally accepted method in Eurocode where piercing is treated. Thus WSP has an interest in what extent piercing of glulam beams is possible.   The purpose of this study is to increase the knowledge regarding the impact that piercing has on a beams load bearing capacity. To examine the impact, three beams of different dimensions are considered where piercing is made in three different placements on the respective beams.  Firstly manual calculations are made by the standards in the Glulam handbook. The results from the method are then checked regarding bending and shear stress. The purpose of the calculations is to determine the maximum hole size and the holes impact on the load bearing capacity for each beam. The methods follows several geometric requirements presented in the Glulam handbook. Similar calculations was also made in Statcon Post&amp;Beams. Statcon is a dimension tool for constructors. A verification of the results from the calculations made by hand was also made.  Lastly the results are presented and analysis is made. Some of the conclusions made were that both calculation methods indicated that piercing should be made as centered as possibly on the beam. The geometrical requirements are a limiting factor since the maximum hole size were restricted on 22 of the 29 beams, even though the calculations proved that bigger holes were possible.

The point with this exam-essay is to study how the strength in glulam beams reinforced with carbon fiber will differentiate with an increased relative humidity (RH). The literature study brings up older work and science in the field that focuses on different reinforcement that can improve the strength in glulam beams.Glulam has higher strength than regular wood, this is due to how glulam is being constructed. When the usage limit condition is being determined the length of the beam will be a factor in deciding highest allowed bending on the beam. Carbon fiber, that has a greater strength than glulam can be used as a reinforcement on the glulam to give it higher strength. When the relative humidity is increased the glulam’s strength will decrease, the goal was to study how great the strength of the reinforced glulam beams would be when the relative humidity in the beams was being increased.In this essay a total of 26 glulam-samples was bent until they reached breaking point, out of these 26 samples half of them will be reinforced with carbon fiber underneath the beam. Half of the samples will be submerged in water, both reinforced and regular beams, where they will stay in two weeks until they are brought up again for bending-tests.The reinforced beams did not show an increase in torque capacity when compared to the non-reinforced beams when analyzing the average force. When analyzing the calculated 95 % -fractile the reinforced beams did show an increase in torque capacity. The dry reinforced glulam-beams showed an increase with 4,8 % and the wet reinforced glulam-beams showed an increase with 13,3 %.