Influence of Ageing and Deterioration of Masonry on Load Bearing Capacity of Historical Building

Numerous heritage buildings in the former Eastern Europe that were neglected in the past are severely deteriorated due to ageing and moisture problems. The paper summarizes experimental and numerical work carried out on 150 yrs. old Kolizej Palace in Ljubljana (Slovenia) which has recently been demolished, despite the overall opinion among conservators that it should be preserved. Experimental tests proved almost completely saturated conditions in the ground level of the building, while all the stories above were in almost dry condition. The results of tests on masonry revealed that moisture content and state of deterioration affected both strength and stiffness properties of built masonry in that extend so that the previous estimations and calculations regarding the state of the structure and its static load bearing capacity were too optimistic. Both storey and global response non-linear seismic analysis have proved that building in its current condition is far below the current seismic code requirements

Testing and analysis of walls strengthened with FRP

U radu je opisana usporedba laboratorijskih i terenskih ispitivanja na posmik zidova ojačanih karbonskim (C) trakama i staklenim (G) mrežicama u polimerima s rezultatima proračunskih modela za zidove s FRP-om. Rezultati ispitivanja na zidovima od nove i stare pune opeke pokazali su povećanje posmične nosivosti i graničnog pomaka - najviše za horizontalne i horizontalno-vertikalne epoksidom zalijepljene trake te mrežice u modificiranom cementnom mortu, a najmanje za dijagonalne trake zbog odstupanja sa zida. ACI i CNR računski modeli pokazali su najbolje podudaranje s eksperimentima.Laboratory and in-situ shear tests of walls strengthened with Carbon FRP (Fiber Reinforced Polymer) strips and Glass FRP grid were compared to the results of different calculation models for masonry with FRP. Tests on new and old solid brick specimens showed an increase in shear strength and ultimate displacement. The best results were obtained with horizontally and horizontally-vertically epoxy-bonded strips and modified cement mortar grid configurations, worse with diagonal strips due to peeling failure. ACI and CNR calculation approaches showed the best agreement with experimental results

Influence of Ageing and Deterioration of Masonry on Load Bearing Capacity of Historical Building

Numerous heritage buildings in the former Eastern Europe that were neglected in the past are severely deteriorated due to ageing and moisture problems. Thepaper summarizes experimental and numerical work carried out on 150 yrs. old Kolizej Palace in Ljubljana (Slovenia) which has recently been demolished,despite the overall opinion among conservators that it should be preserved. Experimental tests proved almost completely saturated conditions inthe ground level of the building, while all the stories above were in almostdry condition. The results of tests on masonry revealed that moisture content and state of deterioration affected both strength and stiffness properties of built masonry in that extend so that the previous estimations and calculations regarding the state of the structure and its static load bearing capacity were too optimistic. Both storey and global response non-linear seismic analysis have proved that building in its current conditionis far below the current seismic code requirements