Abstract
In Italy, most of the residential buildings (77%) were constructed before 1981, when only 25% of the national territory was classified as seismic. Further, the first provisions addressing thermal performance criteria were introduced in 1991, when about 88% of the existing Italian buildings had already been realized. Therefore, the Italian building stock is characterized by a large deficit in terms of both seismic capacity and thermal insulation. The large number of buildings having inadequate performance, both seismic and thermal, calls for rehabilitation interventions that are based on an integrated and sustainability-oriented approach. In the paper, the influence on seismic performance deriving from some retrofitting techniques, generally adopted to enhance the thermal performance of infill walls, has been evaluated. A common residential RC building representative of existing buildings designed only for vertical loads has been studied. The seismic performances have been evaluated through Incremental Dynamic Analyses (IDA). A first comparison is related to a thermal retrofitting intervention made by replacing the existing masonry infill walls with new elements that are able to ensure an adequate thermal protection. Further, a retrofitting intervention based on the “double skin” technique, where new infilled RC frames are added and connected to the existing ones, has been investigated in terms of seismic and thermal performance.
Highlights
Whereas in the past the choice to demolish and replace old constructions that did not meet both modern functional requirements and new safety standards was rather common, more attention is currently devoted to rehabilitating existing structures, extending their service life for as long as possible [1]
In order to increase the seismic performance of infill walls, some authors analysed retrofitting interventions based either on reinforcement meshes placed on one/both faces of walls effectively connected to frames [31,32] or innovative solutions adopting sliding joints to reduce the infill-frame interaction [33,34,35]
With an integrated approach, in the paper the influence on the seismic performance of some retrofitting techniques generally adopted to enhance the thermal performance of infill walls has been investigated
Summary
Whereas in the past the choice to demolish and replace old constructions that did not meet both modern functional requirements and new safety standards was rather common, more attention is currently devoted to rehabilitating existing structures, extending their service life for as long as possible [1]. In order to increase the seismic performance of infill walls, some authors analysed retrofitting interventions based either on reinforcement meshes placed on one/both faces of walls effectively connected to frames [31,32] or innovative solutions adopting sliding joints to reduce the infill-frame interaction [33,34,35] The former solution is able to influence the building performance as a whole [31,36], because seismic response could be similar to a frame-wall system with the related advantages and drawbacks. With an integrated approach, in the paper the influence on the seismic performance of some retrofitting techniques generally adopted to enhance the thermal performance of infill walls has been investigated To this end, Incremental Dynamic Analyses [37] on some existing RC building types have been carried out dealing with a case study structure analysed both as-built and after some possible rehabilitation interventions. The capability in both seismic and thermal rehabilitation through the double skin technique [38] has been analyzed by considering new infilled frames that are effectively connected to the existing ones
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