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Armerade Balkar av Hoegpresterande Betong Belastade med Luftstoetvag (Reinforced High Strength Concrete Beams Subjected to Shock Waves)
Tests on 14 reinforced concrete beams, of which 11 were subjected to shock waves from explosions, are reported. Three different concrete grades were used. The compressive cube strengths of the concretes were 50, 120, and 215 Mpa. The dynamic tests were performed in a shock wave tube. The dynamic tests were divided into three series-one series per concrete grade. The weight of the charge was varied within each test series and ranged from 1.1 kg to 4.0 kg. One beam of each concrete grade was tested statically. In the static tests, the beams were loaded with four point loads by hydraulic jacks. In the static tests, all three beams failed in flexure. The load capacity increased slightly with increasing concrete strength. In the dynamic tests, the beams of the two lower concrete grades without fibers failed in shear when subjected to explosions from charges weighing 2.0 kg and 3.5 kg, respectively. The beams of the highest concrete grade with fibers did not fail even when submitted to the largest charge of 4.0 kg, and no shear cracks were observed. Hence, the tests indicate a major improvement of the impulsive load capacity of reinforced concrete structures by using steel-fibre reinforced ultra-high strength concrete.
Armerade Balkar av Hoegpresterande Betong Belastade med Luftstoetvag (Reinforced High Strength Concrete Beams Subjected to Shock Waves)
Tests on 14 reinforced concrete beams, of which 11 were subjected to shock waves from explosions, are reported. Three different concrete grades were used. The compressive cube strengths of the concretes were 50, 120, and 215 Mpa. The dynamic tests were performed in a shock wave tube. The dynamic tests were divided into three series-one series per concrete grade. The weight of the charge was varied within each test series and ranged from 1.1 kg to 4.0 kg. One beam of each concrete grade was tested statically. In the static tests, the beams were loaded with four point loads by hydraulic jacks. In the static tests, all three beams failed in flexure. The load capacity increased slightly with increasing concrete strength. In the dynamic tests, the beams of the two lower concrete grades without fibers failed in shear when subjected to explosions from charges weighing 2.0 kg and 3.5 kg, respectively. The beams of the highest concrete grade with fibers did not fail even when submitted to the largest charge of 4.0 kg, and no shear cracks were observed. Hence, the tests indicate a major improvement of the impulsive load capacity of reinforced concrete structures by using steel-fibre reinforced ultra-high strength concrete.
Armerade Balkar av Hoegpresterande Betong Belastade med Luftstoetvag (Reinforced High Strength Concrete Beams Subjected to Shock Waves)
M. Hallgren (author) / P. Balazs (author)
1999
56 pages
Report
No indication
English
Construction Materials, Components, & Equipment , Construction Equipment, Materials, & Supplies , Ceramics, Refractories, & Glass , Detonations, Explosion Effects, & Ballistics , Reinforced concretes , High strength concretes , Shock waves , Explosion effects , Concrete beams , Air blast , Blast waves , Blast effects , Compressive strength , Load bearing capacity , Flexural strength , Mechanical properties , Load tests , Dynamic tests , Static tests , Foreign technology
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