Effect of vertical prestressing on the punching failure

The phenomenon of the punching failure of circular reinforced concrete slabs, and the effect of the vertical prestressing on the failure mechanism has been investigated in this paper. The phenomenon was investigated using a finite element package and results were compared with existing experimental data. Results show that slab's ultimate behavior is governed by material behavior within the compressive force path. Vertical prestressing improves triaxial compressive stress state of the critical zone within the compressive force path, and thus results in significantly increased ultimate load and ductility of the slab.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/31053/1/0000730.pd

Compressive Behaviour of Concrete Confined by Aramid Fibre Spirals

The paper reports the experimental results of compressive tests on concrete cylinders wrapped by aramid fibre spirals. Both circular concrete cylinders with a single spiral and rectangular concrete specimens with two interlocking spirals are investigated. Concentric compression tests were carried out. It was found that the behaviour of confined concrete is influenced not only by the concrete strength, but also the spiral leg spacing and the degree of interlocking. Concrete cylinders with close spacing and a high degree of interlocking usually gave higher strength and ductility. Experimental results are compared with analytical data

Failure criteria for concrete under generalised stress states

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