List of publications
Publication: Behaviour of masonry infills subjected to out of plane seismic actions. Part 2: Experimental testing (2016)
Brick and Block Masonry – Trends, Innovations and Challenges
Preparation and upload by:
Filip Anic, Faculty of Civil Engineering and Architecture Osijek, Josip Juraj Strossmayer University of Osijek
List of test setups
Publication abstract (click to enlarge):
Publication abstract (click to shrink):
This paper presents the results of experimental and numerical investigations focusing on the out of plane behaviour of masonry infill walls subjected to seismic actions and proposes several consolidation measures. The proposed strengthening measures have the advantage that they can be applied on existing buildings without affecting the ongoing activities inside. The experimental analysis reveal
This paper presents the results of experimental and numerical investigations focusing on the out of plane behaviour of masonry infill walls subjected to seismic actions and proposes several consolidation measures. The proposed strengthening measures have the advantage that they can be applied on existing buildings without affecting the ongoing activities inside. The experimental analysis revealed an increased bearing capacity of the infill specimens under cyclic loading, and by calibration with numerical modelling the effectiveness of the proposed consolidation solutions can be determined. Based on the results, a development of new cost-effective solutions which are easy to be implemented can be performed. In this article there are presented in comparison the results obtained by theoretical analysis with the experimental results and a few recommendations for designers are given.
Currently in Europe there is a research program that deals with Innovative Systems for Earthquake Resistant Masonry Enclosures in Reinforced Concrete Buildings which aims to improve the non-structural performance of infill walls while minimizing the effects caused by poor detailing and completing the lacking provisions of design codes.
AIM AND SCOPE
In this paper there is going to be studied the out-of-plane behaviour of masonry infills subjected to cyclic loading.
DESIGN AND CONSTRUCTION OF THE TEST SPECIMENS:
An experimental stand was constructed in order to investigate the seismic behaviour of scale 1:1 masonry infill walls subjected to out-of-plane loads. A solution was adopted, combining a reinforced concrete foundation beam with steel columns and beams which compose the frame structure around the infill panels. The configuration of the experimental stand permits the construction of two infill panels in the same time, having a width of 2.65 m and a height of 3.50 m. After the construction of the infill walls, a special anchoring system was provided to the walls in order to apply a cyclic loading procedure. This procedure has 3 cycles for each loading step applied, until a displacement of 45 mm.
A layer of rubber was specially placed between the anchoring system which consisted of steel angle profiles and metal rods which passed through the wall, in order to avoid local crushing of the ceramic blocks. Displacement transducers were provided in the points visible in order to measure the out-of-plane deflection. The wall specimens were constructed simply supported at the base and by means of wooden wedges and a mortar layer, a pinned connection is achieved at the superior part, at the interaction with the steel beam of the experimental stand.
Following the preliminary performed investigations on various types of masonry infill walls, some recommendations can be made:
i. the maximum horizontal force at which failure of a masonry infill wall occurs, can be evaluated by a simplified method, by comparing the maximum tension and compression values in the materials used with the maximum value of forces coming from the seismic bending moment;
ii. the presence of various types of modern mesh systems (glass fibre or aramid) can restore the initial bearing capacity of damaged masonry infill walls, having a drawback of low ductility;
iii. using a thermal insulation system with a reinforced plaster with glass fibre mesh can increase the bearing capacity of masonry infills with at least 5%;
iv. systems with consolidating materials placed on one side of the infill walls are advantageous, easy to install and cheap. They do not require skilled manpower, which is a valuable resource after seismic events.
A good correlation can be observed between the results obtained from the theoretical and experimental analysis. These results were also validated partially with the help of nonlinear computer software. Using consolidating materials placed only on one side of masonry infill walls can be considered a viable solution for increasing their bearing capacity to out-of-plane seismic solicitations. With the help of computer simulations, future parametric studies can be performed in order to determine degradations of rigidity, ductility, deformability and bearing capacity of these infill walls. Also, this approach can lead to the development of new construction methods and technologies for these types of masonry infill walls.
RECOMMENDATIONS FOR FUTURE RESEARCH
None were specified.
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The creation of these resources has been funded by the ERASMUS+ grant program of the European Union under grant no. 2016-1-DE01-KA203-002905. Neither the European Commission nor the project‘s national funding agency DAAD are responsible for the content or liable for any losses or damage resulting of the use of these resources.