In-plane strengthening of timber floors for the seismic improvement of masonry buildings

The use of improvement techniques for the structural rehabilitation of existing timber floors in masonry buildings is more and more recommended also in seismic areas, where a proper in-plane stiffness is required to assure a suitable “box” behaviour. In this context, the study of the influence of deformable floors on the seismic behaviour of existing masonry buildings has not been sufficiently investigated as confirmed by on-site inspections after recent earthquakes. An experimental program was planned at University of Padua in order to evaluate the in-plane behaviour of original and strengthened timber floors. A specific test set-up has been designed and realized on purpose to simulate the monotonic and cyclic shear behaviour. The preliminary experimental results and the comparison between unreinforced and strengthened floors under monotonic load are discussed.

[1]  Daniel P. Abrams,et al.  Structural evaluation of low-rise masonry buildings with flexible diaphragms subjected to earthquake , 1994 .

[2]  Liping Liu.  THEORY OF ELASTICITY , 2012 .

[3]  C. Modena,et al.  Modellazione del comportamento di edifici in muratura sotto azioni sismiche: l’esperienza Umbria –Marche , 2001 .

[4]  Donald W. White,et al.  Nonlinear analysis of a one-story low-rise masonry building with a flexible diaphragm subjected to seismic excitation , 2004 .

[5]  Miha Tomazevic,et al.  Earthquake-Resistant Design of Masonry Buildings , 1999 .

[6]  Roberto Tomasi,et al.  The refurbishment of existing timber floors: characterization of the in-plane behaviour , 2009 .

[7]  Mary Beth D. Hueste,et al.  Seismic Behavior of Wood Diaphragms in Pre-1950s Unreinforced Masonry Buildings , 2004 .

[8]  Maria Rosa Valluzzi,et al.  Experimental assessment and modelling of in-plane behaviour of timber floors , 2008 .

[9]  Claudio Modena,et al.  Edilizia storica monumentale - Salvaguardia degli edifici di interesse storico-artistico nell’emergenza post-sisma , 2012 .

[10]  Lorenzo Macorini,et al.  Strengthening and Stiffening Ancient Wooden Floors with Flat Steel Profiles , 2006 .

[11]  Gennaro Tampone,et al.  Il restauro delle strutture di legno : il legname da costruzione, le strutture lignee e il loro studio, restauro, tecniche di esecuzione del restauro , 1996 .

[12]  M. Corradi,et al.  In-plane shear reinforcement of wood beam floors with FRP , 2006 .

[13]  Lorenzo Macorini,et al.  High reversibility technique for in-plane stiffening of wooden floors , 2008 .

[14]  Dong-Guen Lee,et al.  Effects of inplane floor slab flexibility on the seismic behaviour of building structures , 1994 .

[15]  K. Gatto,et al.  Effects of Loading Protocol on the Cyclic Response of Woodframe Shearwalls , 2003 .

[16]  Hyun-Su Kim,et al.  Efficient seismic analysis of high-rise building structures with the effects of floor slabs , 2002 .

[17]  E. Giuriani,et al.  Experiences from the Northern Italy 2004 earthquake: vulnerability assessment and strengthening of historic churches , 2010 .

[18]  Antonella Saisi,et al.  VULNERABILITY ANALYSIS OF THE HISTORICAL BUILDINGS IN SEISMIC AREA BY A MULTILEVEL APPROACH , 2006 .

[19]  John R. Hayes,et al.  Seismic Response of Low-Rise Masonry Buildings With Flexible Roof Diaphragms , 2001 .