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Forming openings in load-bearing brickwork is a very frequent operation when reforming old buildings. A correct solution requires the supporting structure, usually a steel portal frame, to be loaded by means of hydraulic jacks or some similar system. This step is normally omitted which gives rise to two different problems. Fistly, a delayed loosening of the unsupported area occurs and alarming cracks appear. Secondly and much more dangerous though not so apparent, is the overloading of certain areas of brickwork which can result in collapse due to bearing failure. This article considers the loading sequence for correctly opening up the brickwork. It a/so provides an original in situ method for estimating brickwork strengths as a complement to a visual inspection.

Reforma de edificios antiguos. El rasgado de huecos en muros de carga