Prove sperimentali monotone e cicliche su pareti realizzate con un sistema costruttivo ibrido in legno - calcestruzzo

Proposition of this work is the investigation of the structural behavior of a newly developed timber construction system. It is a modular prefabricated system which combines a typical Platform Frame system with an external small thickness concrete slabs having the function of diaphragm against the horizontal actions and also thermal ad acoustic functions. Walls are formed by in situ connection of the single modules preassembled in the factory, with considerable advantages from the point of view of the site management. The structural design is similar to that of the Platform Frame, where the bracing stiffness and strength assured by nailing the OSB panels to the wooden structure cumulates with that given by the concrete slabs screwed to the vertical structure with large diameter connectors. The use of large diameter connectors assure to the investigated system a considerable stiffness and in the meantime a great capacity of energy dissipation in case of seismic events. In order to verify the real performance of the construction system under seismic actions several monotonic and cyclic tests on single panel modules and on an assembled walls was carried out. Such tests were carried out in accordance with the testing protocols specified in EN 12512. Various configurations of connection to the footing beam and between timber and concrete slab were tested. In this work the results of the experimental tests are reported and the good seismic performance of the structural system has been proved. The analytical expressions that best fit the experimental monotonic load displacement curve are reported and the comparison of the measured results with that calculated according with the national and international codes are given.