Many recently-constructed unreinforced masonry (URM) buildings in Italy performed poorly in the recent earthquakes. Cracks opened in the shear walls and slippage between wall panels occurred. These buildings were made of tile hollow load-bearing blocks, also known as Porotherm block masonry. As part of a program of research to study and experiment reinforcement methods for upgrading such recent building, this paper reports first results of an experimental investigation carried out in the laboratory. Based on on-site survey of damaged buildings after 2016 Central Italy earthquake, full-scale wall panels (160x90x25 cm in nominal dimensions) were constructed and testing was conducted to investigate their structural behavior. Typical defects were added during construction in order to assess their contribution on the structural behavior of wall panels subjected to in-plane lateral loading. It was found that Hollow Load-Bearing Block Walls often require preventive reinforcement. The effects of construction defects reduced the resisting capacity of the in-plane loaded wall, and also changed the failure mode from shear cracking to horizontal sliding.
Reinforcement of historic wall panels with thermoinsulating fiber-reinforced plaster
Antonio Borri;Marco Corradi;Romina Sisti;Giulio Castori
2019
Abstract
Many recently-constructed unreinforced masonry (URM) buildings in Italy performed poorly in the recent earthquakes. Cracks opened in the shear walls and slippage between wall panels occurred. These buildings were made of tile hollow load-bearing blocks, also known as Porotherm block masonry. As part of a program of research to study and experiment reinforcement methods for upgrading such recent building, this paper reports first results of an experimental investigation carried out in the laboratory. Based on on-site survey of damaged buildings after 2016 Central Italy earthquake, full-scale wall panels (160x90x25 cm in nominal dimensions) were constructed and testing was conducted to investigate their structural behavior. Typical defects were added during construction in order to assess their contribution on the structural behavior of wall panels subjected to in-plane lateral loading. It was found that Hollow Load-Bearing Block Walls often require preventive reinforcement. The effects of construction defects reduced the resisting capacity of the in-plane loaded wall, and also changed the failure mode from shear cracking to horizontal sliding.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
