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Mixed-Mode Fracture of Concrete: An Experimental Approach
An experimental investigation into the behavior of concrete under mixed-mode loading was undertaken in the light of fracture mechanics. For this purpose the biaxial machine built at the Stevin Laboratory was used. Three different double edged notched (DEN) specimen sizes with the thickness of 50 mm were adopted. Three types of materials, namely normal concrete of 2 and 16 mm maximum aggregate size and Lytag lightweight concrete of 12 mm maximum aggregate size were used. In summary, five failure modes can be identified from the present experimental observations. They are: (1) tensile diagonal failure, (2) sliding failure, (3) formation of compressive struts, (4) formation of overlapping curved cracks, and (5) a transition between overlapping straight cracks to inclined distributed cracks. The size effect law of Bazant was compared for biaxial tests with proportional load-paths and shows an opposite trend. This might be attributed to the difference in failure modes. From the various load-path investigated, it is concluded that behavior of the specimen under biaxial loading is path dependent.
Mixed-Mode Fracture of Concrete: An Experimental Approach
An experimental investigation into the behavior of concrete under mixed-mode loading was undertaken in the light of fracture mechanics. For this purpose the biaxial machine built at the Stevin Laboratory was used. Three different double edged notched (DEN) specimen sizes with the thickness of 50 mm were adopted. Three types of materials, namely normal concrete of 2 and 16 mm maximum aggregate size and Lytag lightweight concrete of 12 mm maximum aggregate size were used. In summary, five failure modes can be identified from the present experimental observations. They are: (1) tensile diagonal failure, (2) sliding failure, (3) formation of compressive struts, (4) formation of overlapping curved cracks, and (5) a transition between overlapping straight cracks to inclined distributed cracks. The size effect law of Bazant was compared for biaxial tests with proportional load-paths and shows an opposite trend. This might be attributed to the difference in failure modes. From the various load-path investigated, it is concluded that behavior of the specimen under biaxial loading is path dependent.
Mixed-Mode Fracture of Concrete: An Experimental Approach
M. B. Nooru-Mohamed (author)
1992
166 pages
Report
No indication
English
Construction Equipment, Materials, & Supplies , Construction Materials, Components, & Equipment , Concretes , Cracking(Fracturing) , Mechanical properties , Stress analysis , Loads(Forces) , Stiffness , Theses , Test facilities , Mathematical models , Structural members , Crack propagation , Failure , Mechanical tests , Foreign technology
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