ANIDIS - L'ingegneria Sismica in Italia, ANIDIS XIX & ASSISi XVII - 2022

Dimensione del carattere:  Piccola  Media  Grande

Numerical simulation of a timber retrofit solution for unreinforced masonry buildings

Gabriele Guerrini, Nicolò Damiani, Marco Miglietta, Francesco Graziotti

Ultima modifica: 2022-08-29


This paper presents the results of a numerical study about the performance of a new timber retrofit solution for unreinforced masonry buildings in seismic regions. The proposed retrofit consists of timber frames fastened to the internal surface of masonry piers, with oriented-strand boards nailed to the frames. This technique aims at improving both the in-plane and out-of-plane capacities of masonry piers as well as wall-to-diaphragm connections. Quasi-static cyclic shear-compression tests were first conducted on two isolated piers to assess the in-plane response improvement. Dynamic shake-table tests were then performed on two full-scale building specimens representing the end-unit of a cavity-wall terraced house, in bare and retrofitted conditions, where also the timber diaphragms were stiffened. Numerical models were built and calibrated against the experimental data adopting an equivalent-frame approach, where masonry members were discretized into multiple nonlinear macroelements while timber components were represented by equivalent elasto-plastic truss elements. Results in terms of hysteretic lateral force-displacement responses from nonlinear dynamic analyses are discussed to validate the proposed modeling strategy.

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