GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.2 GNGTS 2023 Figure 1. An example of MAP building realized in Sassa (AQ) The aim of this project was to build definitive and not "temporary" buildings, able to either become a permanent residence or to be adapted to new uses (e.g. a reconversion of the building into a university residence), by using virtuous materials and architecture, and resulting into an energetically efficient and environmentally sustainable construction (De Agostini, 2010). These one or two-floor buildings are small flats having a surface from 40 to 70 m 2 realized by employing two of the most common wood-based earthquake-resistant structural systems, the light frame or the cross-laminated timber (CLT) system. In the light frame system, the load-bearing elements are frames made of glue-laminated (or even glued solid timber or solid timber) studs and plates, generally made of spruce and fir, sheathed with nailed-on plywood or OSB panels. The sheathing has the function of stiffening and stabilization of the frame against horizontal forces (Terzi, 2010). In the CLT construction, the lightframe wall panels are replaced by solid wood panels made of CLT (cross-laminated timber), which are also used for the floors. CLT is a bi-dimensional (plate-like) member, and the adjacent layers of boards are arranged at a right angle. In this way, the effects of a board defect, such as a knot, on the strength of the panel are markedly reduced and therefore a significant improvement in the panel strength with respect to the board strength can be attained (Negri et al., 2012). The connection to the concrete foundation is usually made by means of hold-down at wall ends and at opening ends as uplift restraint connections, and anchor bolts, steel plates or angle brackets uniformly distributed along the length of the wall as sliding restraint connections. The CLT panels are connected to each other using self-drilling screws.