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A platform for research: civil engineering, architecture and urbanism
Bearing Capacity of Partially Loaded Concrete Elements
Abstract There are numerous situations where compressive loads are introduced into members over small areas. The stress distribution in these zones, which are depicted D for disturbed, is non-uniform. The flow of compressive stresses into the surrounding member induces transverse tensile stresses which can cause premature splitting failures. D regions are typically designed using the strut-and-tie method (STM). The STM design recommendations provided by ACI 318 (2014), fib Model Code (2010) (2013) and Eurocode 2 (2004), limit bearing stresses to admissible values which depend on a strut efficiency factor (β s ). This paper uses a database with 162 tests on partially loaded concrete prisms without and with crack-control reinforcement to evaluate these provisions and to discuss the influence of parameters like the concrete strength (f c ), the crack-control reinforcement ratio (ρ), concentration ratio (b/a) and aspect ratio (h/b). It also presents results of four tests on diamond-shaped concrete prisms carried out to evaluate the effect on resistance of increasing ρ. Experimental results show that crack-control reinforcement increases both ductility and resistance. Existing design provisions are shown to be conservative.
Bearing Capacity of Partially Loaded Concrete Elements
Abstract There are numerous situations where compressive loads are introduced into members over small areas. The stress distribution in these zones, which are depicted D for disturbed, is non-uniform. The flow of compressive stresses into the surrounding member induces transverse tensile stresses which can cause premature splitting failures. D regions are typically designed using the strut-and-tie method (STM). The STM design recommendations provided by ACI 318 (2014), fib Model Code (2010) (2013) and Eurocode 2 (2004), limit bearing stresses to admissible values which depend on a strut efficiency factor (β s ). This paper uses a database with 162 tests on partially loaded concrete prisms without and with crack-control reinforcement to evaluate these provisions and to discuss the influence of parameters like the concrete strength (f c ), the crack-control reinforcement ratio (ρ), concentration ratio (b/a) and aspect ratio (h/b). It also presents results of four tests on diamond-shaped concrete prisms carried out to evaluate the effect on resistance of increasing ρ. Experimental results show that crack-control reinforcement increases both ductility and resistance. Existing design provisions are shown to be conservative.
Bearing Capacity of Partially Loaded Concrete Elements
Pamplona, Matheus K. Y. (author) / Ferreira, Maurício P. (author) / Vollum, Robert L. (author)
2017-08-06
8 pages
Article/Chapter (Book)
Electronic Resource
English
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