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| 4. |
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| 5. |
- Gabrielsson, Henrik, et al.
(författare)
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Seghet i högpresterande betongkonstruktion
- 1996
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Ingår i: Byggforskning : Byggforskningsrådets tidning för en bättre byggd miljö. - 1102-3686. ; :3, s. 42-
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 6. |
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| 7. |
- Klisinski, Marek, et al.
(författare)
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Modelling of cracking of concrete with mixed mode inner softening band
- 1995
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Ingår i: Engineering mechanics. - : American Society of Civil Engineers (ASCE). ; , s. 1095-1098
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Konferensbidrag (refereegranskat)abstract
- The inner softening band approach is used to model the mixed mode (mode I and II) cracking of concrete. The softening behaviour is attributed to a displacement discontinuity within an element. The constitutive relation between tractions and relative displacements is based on the Mohr-Coulomb criterion with tension cut-off. Softening affects both the tensile strength and the cohesion of the material. The cracking pattern is controlled by an energy criterion leading to fairly unique results. Some numerical examples show that the results are objective and independent, to a certain degree, on finite element mesh
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| 10. |
- Noghabai, Keivan, et al.
(författare)
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Effect of tension softening of concrete on the tension stiffening of rebars in plain and fibrous concrete
- 1998
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Ingår i: Fracture mechanics of concrete structures. - : AEDIFICATIO Publishers. - 3931681246 ; , s. 1547-1556
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Konferensbidrag (refereegranskat)abstract
- Tension stiffening effect on rebars embedded in concrete prisms are investigated through computational as well as analytical methods and compared with experimental results. Both metallic (steel) and non-metallic (polyolefin and carbon) fibres of different dimensions are used in high-strength concrete. The softening behaviour of concrete determined by a uniaxial tensile procedure, was used in FEM and analytical models. The tension stiffening effect may be more dependent on the tensile behaviour of the concrete than on a relative slip between rebar and concrete
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| 11. |
- Noghabai, Keivan, et al.
(författare)
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Fibre reinforced high strength concrete beams in shear
- 1999
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Ingår i: High strength concrete : first international conference. - : American Society of Civil Engineers (ASCE). - 0784404194 ; , s. 480-193
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Konferensbidrag (refereegranskat)
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| 12. |
- Noghabai, Keivan, et al.
(författare)
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Fracture mechanics applied to bond
- 1997
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Ingår i: Advanced design of concrete structures. - Barcelona : International Center for Numerical Methods in Engineering (CIMNE). - 8487867944 ; , s. 57-64
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Konferensbidrag (refereegranskat)
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| 13. |
- Noghabai, Keivan, et al.
(författare)
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Load carrying capacity of beams using fibres as shear reinforcement
- 1998
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Ingår i: Fracture mechanics of concrete structures. - : AEDIFICATIO Publishers. - 3931681246 ; , s. 1491-1500
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Konferensbidrag (refereegranskat)abstract
- The load bearing capacity of reinforced beams of fibrous high- strength concrete is investigated, experimentally and computationally. Both metallic (steel) and non-metallic (polyolefin and carbon) fibres are used, keeping the volume fraction to 1%. A nonlinear truss model is outlined which incorporates most of the pertinent mechanisms in the experiments, including the rebar-to-concrete bond and crack widths. The law for evolution of stable growth of local cracks in the structure is based on the response of uniaxial tensile tes
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| 14. |
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| 15. |
- Ohlsson, Ulf, et al.
(författare)
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Influence of hydraulic pressure in fracture mechanics modelling of crack propagation in concrete
- 1998
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Ingår i: Materials and Structures. - 1359-5997 .- 1871-6873. ; 31:3, s. 203-208
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Tidskriftsartikel (refereegranskat)abstract
- This paper presents a nonlinear fracture mechanics analysis of a part of an offshore concrete structure. The analysis focuses on the risk of cracking between the prestressing ducts in the shaft of the submerged platform. The influences of water and grout pressure in prestressing ducts have been taken into consideration. The analysis has been performed using both discrete and smeared crack analysis.
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| 16. |
- Ohlsson, Ulf, et al.
(författare)
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Mixed-mode fracture and anchor bolts in concrete analysis with inner softening bands
- 1997
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Ingår i: Journal of engineering mechanics. - 0733-9399 .- 1943-7889. ; 123:10, s. 1027-1033
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Tidskriftsartikel (refereegranskat)abstract
- The paper presents a nonlinear fracture mechanics analysis of mixed-mode fracture and anchor pullout in concrete. The analysis is based on elements with inner softening bands (ISB). A major advantage of the ISB approach is that discrete cracks can be introduced anywhere and in any direction within the finite-element mesh. Calculated loads, deformations, and crack patterns are compared to experimental results. A good correspondence is achieved.
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| 17. |
- Olofsson, Thomas, 1968-, et al.
(författare)
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A method for predicting the annual building heating demand based on limited performance data
- 1998
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Ingår i: Energy and Buildings. - : Elsevier. - 0378-7788 .- 1872-6178. ; 28:1, s. 101-108
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we present an investigation of the possibility to use a neural network combined with a quasi-physical description in order to predict the annual supplied space heating demand (P) for a number of small single family buildings located in the North of Sweden. As a quasi-physical description for P, we used measured diurnal performance data from a similar building or simulated data from a steady state energy simulation software. We show that the required supplied space heating demand may be predicted with an average accuracy of 5%. The predictions were based on access to measured diurnal data of indoor and outdoor temperatures and the supplied heating demand from a limited time period, ranging from 10 to 35 days. The prediction accuracy was found to be almost independent of what time of the year the measurements were obtained from, except for periods when the supplied heating demand was very small. For models based on measurements from May and fo some buildings from April and September, the prediction was less accurate.
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| 18. |
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| 19. |
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| 20. |
- Olofsson, Thomas, et al.
(författare)
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Anchorage and bond properties in concrete
- 1995
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Ingår i: Fracture of brittle, disordered materials. - London : Taylor and Francis Group. - 0419190503 ; , s. 525-543
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Konferensbidrag (refereegranskat)
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| 21. |
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| 22. |
- Olofsson, Thomas, 1968-, et al.
(författare)
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Energy load predictions for buildings based on a total demand perspective
- 1998
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Ingår i: Energy and Buildings. - : Elsevier. - 0378-7788 .- 1872-6178. ; 28:1, s. 109-116
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Tidskriftsartikel (refereegranskat)abstract
- The outline of this work was to develop models for single family buildings, based on a total energy demand perspective, i.e., building-climate-inhabitants. The building-climate part was included by using a commercial dynamic energy simulation software. Whereas the influence from the inhabitants was implemented in terms of a predicted load for domestic equipment and hot water preparation, based on a reference building. The estimations were processed with neural network techniques. All models were based on access to measured diurnal data from a limited time period, ranging from 10 to 35 days. The annual energy predictions were found to be improved, compared to models based on only a building-climate perspective, when the domestic load was included. For periods with a small heating demand, i.e., May-September, the average accuracy was 7% and 4% for the heating and total energy load, respectively, whereas for the rest of the year the accuracy was on average 3% for both heating and total energy load.
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| 26. |
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| 27. |
- Påhlsson, Ingemar, et al.
(författare)
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Pollen och makrofossilanalys
- 1995
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Ingår i: Fagerlund, Dan; HAmilton, John: Arkeologi på väg - undersökningar för E18. Annelund - en hällkista och bebyggelse från senneolitikum och bronsålder. - : Riksantikvarieämbetet. - 9171929932 ; :13
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Annan publikation (övrigt vetenskapligt/konstnärligt)
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