The mechanical behaviour of the roof structure in masonry building concerns the safety of the whole masonry organism when subjected to dynamic loading. Wood roofs, despite their lightness, cannot guarantee a good behaviour against the effects of horizontal forces acting on the structure under a seismic loading. In order to improve the mechanical behaviour of the connection between the roof and the masonry walls, reinforced concrete (RC) ring – beams have been widely used in these last decades. This technique allows giving a sensible improvement of seismic response of the building. However, the different material properties of concrete and masonry require the necessity to connect the concrete ring beam to the underlying masonry. Nevertheless the additional mass added on the top of the building has negative effects when the building is subjected to seismic loading. In order to avoid these problems a possible solution could be the use of reinforced masonry ring – beams. This solution, thanks to the use of innovative materials as FRP (Fiber Reinforced Polymer) and SRG (Steel Reinforced Grout), can be today a good substitute, either under a technical and economical perspective, of concrete ring – beams. The masonry ring beam provides the same structural benefits of the RC solution without increasing the weight and avoiding the necessity (for SRG solution) to realize connections with the masonry walls below. This paper will illustrate a first application of an SRG masonry ring – beam on an ancient tower in the city of Trevi (Italy). After a first analysis of the behaviour of this new structural solutions, the results of a first set of tests on reinforced masonry beams will be presented and discussed. Finally, the site installation of the masonry ring beam will be illustrated.
Performance of reinforced masonry bond beams
BORRI, Antonio;CASTORI, GIULIO;
2007
Abstract
The mechanical behaviour of the roof structure in masonry building concerns the safety of the whole masonry organism when subjected to dynamic loading. Wood roofs, despite their lightness, cannot guarantee a good behaviour against the effects of horizontal forces acting on the structure under a seismic loading. In order to improve the mechanical behaviour of the connection between the roof and the masonry walls, reinforced concrete (RC) ring – beams have been widely used in these last decades. This technique allows giving a sensible improvement of seismic response of the building. However, the different material properties of concrete and masonry require the necessity to connect the concrete ring beam to the underlying masonry. Nevertheless the additional mass added on the top of the building has negative effects when the building is subjected to seismic loading. In order to avoid these problems a possible solution could be the use of reinforced masonry ring – beams. This solution, thanks to the use of innovative materials as FRP (Fiber Reinforced Polymer) and SRG (Steel Reinforced Grout), can be today a good substitute, either under a technical and economical perspective, of concrete ring – beams. The masonry ring beam provides the same structural benefits of the RC solution without increasing the weight and avoiding the necessity (for SRG solution) to realize connections with the masonry walls below. This paper will illustrate a first application of an SRG masonry ring – beam on an ancient tower in the city of Trevi (Italy). After a first analysis of the behaviour of this new structural solutions, the results of a first set of tests on reinforced masonry beams will be presented and discussed. Finally, the site installation of the masonry ring beam will be illustrated.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
