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Both authors are innovators of the prefabrication of concrete structures an important advance towards industrialization of the building process. The detailing of connections between the factory produced elements is crucial, and the "strut and tie" models presented here can be directly applied in str
Issue for Mar. 1981 contains index for Jan.-Mar. 1981 in microfiche form.
"This is a Ph.D. dissertation. Hollow core (HC) slabs are made of precast concrete with pretensioned strands. These slabs are popular as floor structures in offices and housing. At ambient conditions, the load bearing capacity can be dominated by four diff"
A design method is proposed for hollow-core slabs with or without structural in-situ concrete topping. The failure mechanisms considered are flexural tensile failure, flexural compression failure, flexural cracking failure, anchorage failure, shear tension failure and failure at the interface of precast and in-situ concrete. Prediction of the cracking moment and deflections are also considered. A computer program, including the design method, was developed and used to simulate 348 full-scale loading tests. Comparing predicted cracking cpacities with those observed showed the flexural tensile strength of concrete to be independent of the slab thickness. At an assumed flexural tensile strength of 1.1 times the tensile strength (5 % fractile), roughly 80 % of the predicted cracking capacities were smaller than those observed. The prediction of shear capacity was very accurate for 265 mm slabs and fairly accurate for thinner slabs, but the tensile strength of concrete had to be reduced by 30 % in order to make the prediction for 400 m slabs conservative enough. No problems arose with the bending capacity, when the 0.2 % yield strength was used for the strands. In composite slabs, the observed deflections and cracking capacities agreed well with those predicted when the effective differential shrinkage was taken to be 35 % of the differential shrinkage calculated according to the CEB-FIP Model Code. A design method is proposed for hollow-core slabs with or without structural in-situ concrete topping. The failure mechanisms considered are flexural tensile failure, flexural compression failure, flexural cracking failure, anchorage failure, shear tension failure and failure at the interface of precast and in-situ concrete. Prediction of the cracking moment and deflections are also considered. A computer program, including the design method, was developed and used to simulate 348 full-scale loading tests. Comparing predicted cracking cpacities with those observed showed the flexural tensile strength of concrete to be independent of the slab thickness. At an assumed flexural tensile strength of 1.1 times the tensile strength (5 % fractile), roughly 80 % of the predicted cracking capacities were smaller than those observed. The prediction of shear capacity was very accurate for 265 mm slabs and fairly accurate for thinner slabs, but the tensile strength of concrete had to be reduced by 30 % in order to make the prediction for 400 m slabs conservative enough. No problems arose with the bending capacity, when the 0.2 % yield strength was used for the strands. In composite slabs, the observed deflections and cracking capacities agreed well with those predicted when the effective differential shrinkage was taken to be 35 % of the differential shrinkage calculated according to the CEB-FIP Model Code.