scholarly journals A Fundamental Study on Mechanical Characteristics of Mortar Used for Historical Masonry Structures

1999 ◽  
Vol 10 (1) ◽  
pp. 41-50
Author(s):  
Takayoshi Aoki ◽  
Norio Ito ◽  
Terunori Kadoya ◽  
Atsunori Miyamura
Keyword(s):  
Mechanical Characteristics ◽  
Masonry Structures ◽  
Fundamental Study ◽  
Historical Masonry

THE EFFECT OF MOISTURE ON SIGNIFICANT MECHANICAL CHARACTERISTICS OF MASONRY

2010 ◽  
Vol 2 (3) ◽  
pp. 79-85 ◽  
Author(s):  
Jiri Witzany ◽  
Tomas Cejka ◽  
Radek Zigler
Keyword(s):  
Building Materials ◽  
Mechanical Characteristics ◽  
Laboratory Research ◽  
Masonry Structures ◽  
Historical Structures ◽  
Historical Masonry ◽  
Effect Of Moisture ◽  
Masonry Units ◽  
Physical And Mechanical Characteristics

Experimental and laboratory research into residual physical and mechanical characteristics of historical masonry structures (GAČR 2008; Witzany 2008), in particular the determination of residual strength and modulus of elasticity in compression, included research oriented towards the effect of moisture and porosity on the respective characteristics of masonry units – bricks, sandstone and arenaceous marl. Partial results published in (Witzany et al. 2008) and in this paper testify to the need for further research into the effects of porosity, moisture and chemism on the development of characteristics of building materials applied on historical structures.

scholarly journals The Impact of Timber Roof Framework Over Historical Masonry Structures

2019 ◽  
Vol 603 ◽  
pp. 042030
Author(s):  
Eugen Onescu ◽  
Iasmina Onescu ◽  
Marius Mosoarca
Keyword(s):  
Masonry Structures ◽  
Historical Masonry ◽  
The Impact

scholarly journals Acoustic Emission Health Monitoring of Historical Masonry to Evaluate Structural Integrity under Incremental Cyclic Loading

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 508 ◽  
Author(s):  
Georgios Livitsanos ◽  
Naveen Shetty ◽  
Els Verstrynge ◽  
Martine Wevers ◽  
Danny Van Hemelrijck ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Velocity Distribution ◽  
Health Monitoring ◽  
Source Location ◽  
Pulse Velocity ◽  
In Situ Monitoring ◽  
Masonry Walls ◽  
Masonry Structures ◽  
Velocity Measurements ◽  
Historical Masonry

Historical masonry structures during the decades, were composed with a variety of brick and mortar types according to materials availability of each region and the desirable mechanical properties in each specific case. Different composition of mortars leads to another masonry behavior, and each one is suited for different structural purposes. A crucial aspect in damage evaluation of masonry structures is the analysis of long-term behavior which has a great influence on safety assessment of these structures. In this study, cement, hybrid lime cement, hydraulic lime and lime hydrate mortars were assembled with solid red clay bricks to compose four masonry walls of dimensions 515 × 376 × 90 mm. They were tested under cyclic compression loading. Acoustic Emission (AE) allowed in situ monitoring of damage progression. AE is a powerful non-destructive technique applied to identify micro and macro-defects and their temporal evolution in several materials. This technique permits to estimate a variety of characteristics during fracture propagation to obtain information on the criticality of the ongoing process. Specifically, analyzing and comparing AE parameters among the loading cycles of each wall specimen and among the different masonry compositions, an integrity assessment can be achieved. Furthermore, in each loading and unloading step, pulse velocity measurements were conducted using the AE apparatus in order to gain a velocity distribution mapping among the sensors. Each sensor was pulsed in turn, with all other sensors acting as receivers, generating a velocity matrix from one sensor to another. This provided an insight into the damage severity of masonry walls with the increasing number of loading cycles. This measurement was also necessary for refining AE source location accuracy by using either the horizontal or the vertical velocity. Two different cases were investigated. The use of one uniform velocity for the whole masonry wall and the assumption that the velocity differs in the two vertical directions due to the heterogeneity of the structure. These two cases result in differences in the quantity and the position of the localized events. Furthermore, applying direct ultrasonic pulse velocity measurements, in the direction of the width of masonry walls, another integrity investigation was feasible. The presented results further demonstrate the relationships between AE parameter-based analysis, velocity distribution and source location during cyclic compressive loading in masonry specimens. The identification of the nature of damage through the entire dataset of all sensor arrays provides a promising example for structural health monitoring applications on larger scale masonry specimens. As a conclusion, AE activity analysis proved to be a very efficient approach to evaluate fracture progress in masonry.

scholarly journals Tunnelling-induced deformation and damage on historical masonry structures

Géotechnique ◽  
2014 ◽  
Vol 64 (2) ◽  
pp. 118-130 ◽  
Author(s):  
A. AMOROSI ◽  
D. BOLDINI ◽  
G. DE FELICE ◽  
M. MALENA ◽  
M. SEBASTIANELLI
Keyword(s):  
Masonry Structures ◽  
Historical Masonry
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