In this work, the development of a design proposal regarding the application of a new strengthening technique of flat slabs, consisting of post-tensioning with anchorages by bonding is presented. This design proposal is based in experimental tests results, namely, pull-out and push-in bond tests of prestress strands and slab punching tests, whose main results are presented. Taking into account the experimental results of the bond tests, it was possible to determine a bond stress/slip law for both, the transmition and pull-out stages, that enabled to draw simple design rules for the allowable transmition and maximum pull-out loads. Afterwards, and based in the previously determined bond stress/slip laws, a design proposal is presented that is able to predict the strand forces evolution, taking into account its free and bonded lengths, as the slab is loaded up to punching failure, turning possible the computation of the increase of the prestress deviation forces, reducing the effective punching loads, thus increasing the punching capacity.
|Title of host publication||fib Symposium: Engineering a concrete structure: Technology, modelling and construction|
|Publication status||Published - 1 Jan 2013|
|Event||fib Symposium - |
Duration: 1 Jan 2013 → …
|Period||1/01/13 → …|