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- Cederwall, Krister
(författare)
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Behavior of a reinforced ice-cover with regard to creep
- 1981
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Ingår i: POAC 81. - : Universite Laval. ; , s. 562-570
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Konferensbidrag (refereegranskat)abstract
- Different kinds of reinforcing materials have been tested in order to find out the possible increase in the bearing capacity and ductility of an ice-cover. A number of fifty ice-beams have been tested both in the field and in the laboratory. It has been shown that by rather simple means, for instance by wooden reinforcement, it is possible to increase the bearing capacity about three times and the ductility up to twenty times. The ice-cover can be supplied with reinforcement both in the upper surface and in the lower surface. It has moreover been shown that rather high tensile stresses in the reinforcement can be utilized when the ice-cover is loaded above the cracking stage. At ultimate load, tensile stresses in steel-reinforcement are found to be in the vicinity of 400 MPa. Shear or heavy bond slip can be the cause of failure when too large amount of reinforcement is used. In order to get more accurate design recommendations, a number of ice-beams have been studied in the laboratory. The stress-distribution in the compressive zone and its change with the loading time have been studied in some creep-tests. A bending theory that includes the effect of creep in the compression zone has been derived. The agreement between theory and experiment is sufficiently good
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- Elfgren, Lennart, et al.
(författare)
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Fatigue of anchor bolts in reinforced concrete foundations
- 1982
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Ingår i: Fatigue of Steel and Concrete Structures. - Zürich : International Association for Bridge and Structural Engineering. - 3857480300 ; , s. 463-470
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Konferensbidrag (refereegranskat)
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| 13. |
- Elfgren, Lennart, 1942-
(författare)
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Injekteringsförankrade kohesionsstag : Belastningsförsök med dragstag i lera
- 1971
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- Sedan tekniken att förankra provisoriska sponter med dragstag injekterade i berg eller friktionsjörd introducerades har tanken på att förankra sponter i lera av Göteborgskaraktär ständigt förekommit hos dem som brottas med problemet att få dessa sponter stabila. För att undersöka möjligheterna gjordes år 1966-1967 en serie belastningsförsök med tre stag injekterade i lera. Härvid studerades stagens last-deformationsegenskaper vid korttids- och långtidsförsök. Dessutom bestämdes stagens brottlaster (200, 240 och 260 kN). Försöksresultaten presenteras i denna rapport jämte en diskussion om stagens lastupptagande förmåga.
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- Emborg, Mats, et al.
(författare)
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Fatigue strength of cable couplers in prestressed concrete beams
- 1982
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Ingår i: Nordic Concrete Research. - 0800-6377. ; 1, s. 5.1-5.14
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Tidskriftsartikel (refereegranskat)abstract
- Fatigue tests have been carried out on ten prestressed concrete beams. Six of the beams were furnished with a cable coupler in the mid-span and four beams had no cable coupler. The uncoupled beams could in some cases sustain 9 times as many load cycles as the coupled beams. Some probable causes to the coupled beams lower fatigue strength are discussed in the paper.
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- Vännman, Kerstin, et al.
(författare)
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A statistical approach to composite beams
- 1982
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Ingår i: Nordic Concrete Research, Publication No 1. - : The Nordic Concrete Federation.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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