Resumen

DUENAS PUENTES, Diego Ernesto  y  MOLINA HERRERA, Maritzabel. Wobble friction coefficient in post-stressed concrete. Ing. Investig. [online]. 2007, vol.27, n.3, pp.16-23. ISSN 0120-5609.

This work was aimed at establishing a wobble friction coefficient (K) from records regarding some post-stressed bridges built in Colombia. Such records were arranged and analysed together with stress diagrams resulting from the corresponding plans, calculations and reports. Suitable records were produced from this review to make the analysis. Once the records had been selected, the probable wobble friction coefficient (K) was then calculated for each case and this coefficient was related to the length of the cable and the total area of the strands composing the cable. These records and their results were subsequently grouped according to the type of bridge to produce a wobble friction coefficient (K) for each specific structure. The study indicated that the wobble friction coefficient was lower than that indicated by the Colombian Seismic Bridge Design Code, Instituto Nacional De Vías, 1995]. The influence of tensioning equipment, materials and labour suggested a format for recording tensioning to reduce inaccuracy when readings are being taken. A reduction in the costs of tensioning would arise from taking the forgoing into account.

Palabras clave : wobble friction coefficient; strain; strand; cable; cantilever bridge; beam-slab bridge.

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