RESUMO
A mobile laboratory, provided with a knowledge based system, is presented whose objectives are to support the procedures leading to the seismic assessment of masonry buildings and the planning of precautionary operations on them The architecture of the laboratory and its functions are described with emphasis on the main parts of it: the hardware part, consisting of a vehicle, a special container, experimentl equipment and electronic devices; the software part with a knowledge - based system, in particular, implementing models of the structure and possible seismic behaviours of buildings. The testing of one model is also presented through the comparison of its results with the seismic behaviour of large scale masonry buildings prototypes tested on a shaking table (AU)