ブックタイトル「煉瓦造建造物の保存と修復」英語版

概要

「煉瓦造建造物の保存と修復」英語版

improving the resistance of an arched bridge. A newmasonry layer was added to increase wall thickness forimproving seismic performance. Also, fiber reinforcementwas adopted to further assure safety. This is an example inwhich traditional methods were developed to secure therequired level of safety.(slide 58) This is another example that I took interest in.Reinforced concrete slabs were employed to confine the infillof stone and gravel within walls for reinforcement. Higherrigidity was achieved without the addition of fibers, resultingin the same effect as that of fiber reinforcement. The topconcrete layer can be removed.Reinforcement of Floor Structures(slides 59-62) Experiments have been undertakenon measures to improve seismic performance of floorstructures. In the past, it was considered best for floorstructures to be stronger. For the plane of the floor tobe rigid, wood frame floor structures were replaced withreinforced concrete structures. However, today, after havingobserved the consequences of these alterations, I can warnpeople to“be careful.”Increased rigidity means increase instructural response and therefore, for example, a differentmethod of placing and binding together another layer offloor boards (instead of replacing) on top of the extant floorboards can be considered. The effectiveness of this methodis now being confirmed. Also, in an example from thepast, bracing was introduced, which can take the place ofreinforcing with boards or plywood.Prof. Eng. Claudio ModenaInterventions - RESEARCHInterventions to reduce excessive floor deformability? Different strenghetning systems(plankings, diagonals, nets, ..) and materials(wood, earth, FRP, Natural fibres) applied atthe extrados, for a total of 35 laboratorytests? High performance obtained for woodenplanking (45°, single or double) both forstrength and deformation capacity? The shear stiffness of the joist ceiling isprincipally influenced by the plankingthickness? The shear capacity of the floors is linearlyrelated with the strength of the fasteners? Proper double planking provides stiffnesscapable to redistribute horizontal loads tobearing walls, comparable to the effect ofmore modern floorsslide 60SM IngegneriaProf. Eng. Claudio ModenaDepartment of Civil, Environmental and Architectural EngineeringUniversity of Padova, ItalyGresal bridge?retrofit interventionCORINGARCH CROWN STRATIGRAPHYThe structural investigation consisted in a geometrical survey and three core samples, one taken from the vault atthe crown, the second taken from the pier and the third one drilled in the abutment, on an inclined plane. Theseinvestigations have allowed to determine the thickness of the brick stone, the layering of the material between thepavement and the masonry vault and to characterize the mechanical property of the infill material. The infill has verygood mechanical characteristics and is made by stones and pebbles.slide 58Prof. Eng. Claudio ModenaInterventions - RESEARCHInterventions to reduce excessive floor deformability? Different strenghetning systems(plankings, diagonals, nets, ..) and materials(wood, earth, FRP, Natural fibres) applied atthe extrados, for a total of 35 laboratorytests? High performance obtained for woodenplanking (45°, single or double) both forstrength and deformation capacity? The shear stiffness of the joist ceiling isprincipally influenced by the plankingthickness? The shear capacity of the floors is linearlyrelated with the strength of the fasteners? Proper double planking provides stiffnesscapable to redistribute horizontal loads tobearing walls, comparable to the effect ofmore modern floorsslide 61SM IngegneriaProf. Eng. Claudio ModenaProf. Eng. Claudio ModenaInterventions - APPLICATIONSSM IngegneriaInterventions - APPLICATIONSSM IngegneriaInterventions to reduce excessive floor deformabilityInterventions to reduce excessive floor deformabilityInterventions aimed at the in-plane stiffening of existing floors must be carefullyevaluated since the horizontal seismic action is transferred to the different masonrywalls in function of the floor plane action, depending on its stiffness.Ca’Duodo, Padova, XV c.In plane and flexural floors stiffening with‘dry’techniques is obtained by providing, atthe extrados of the existing floor, a further layer composed by wooden planks, withorthogonal direction respect the existing.AxonometricviewThe use of metallicbelts or FRP strips,disposed in a crossedpattern and fixed at theextrados of the woodenfloor or the use ofmetallic tie-beamsbracings, may improvethe stiffening effect.A. Borrislide 59slide 6259