Damage detection of concrete masonry structures by enhancing deformation measurement using DIC

2016 ◽  
Author(s):  
Mohammad Bolhassani ◽  
Satish Rajaram ◽  
Ahmad A. Hamid ◽  
Antonios Kontsos ◽  
Ivan Bartoli
Keyword(s):  
Damage Detection ◽  
Deformation Measurement ◽  
Masonry Structures ◽  
Concrete Masonry

scholarly journals Proposal for improved mixes to produce concrete masonry units with commonly used aggregates available in the Valley of Mexico

2017 ◽  
Vol 7 (1) ◽  
pp. 36-56
Author(s):  
A. Tena ◽  
A. Liga ◽  
A. Pérez ◽  
F. González
Keyword(s):  
Mexico City ◽  
Raw Materials ◽  
Federal District ◽  
Masonry Structures ◽  
Construction Site ◽  
Test Results ◽  
Concrete Masonry ◽  
Distrito Federal ◽  
Design Value ◽  
Masonry Units

Proposal for improved mixes to produce concrete masonry units with commonly used aggregates available in the Valley of MexicoABSTRACTIn this paper, a proposal is done to update the masonry index compressive strength design value f*m for solid concrete masonry units for the masonry guidelines of Mexico´s Federal District Code (NTCM-2004). Solid units were made by taking into account the characteristics of the most commonly used raw materials available in the Valley of Mexico to fabricate such units in the Metropolitan Area of Mexico City. Different tests were conducted for both raw materials and the obtained concrete units. Based upon test results, it is illustrated why it is much better to design masonry structures based upon the experimental data of the units to be used at the construction site rather than using index values proposed in building codes.Keywords: masonry; concrete masonry units; compressive strength.Propuesta de mejora de mezclas para producir piezas de mampostería de concreto empleando materiales comúnmente disponibles en el Valle de MéxicoRESUMENSe presenta un estudio donde se hace una propuesta para actualizar los valores índices de la resistencia a la compresión de mamposterías (f*m) elaboradas con piezas de concreto especificados en las normas de mampostería vigentes en el Distrito Federal. Se realizó un estudio de mercado, donde se tomaron en cuenta las características de los materiales comúnmente utilizados en la actualidad en el Valle de México para la fabricación de piezas de concreto sólidas, incluyendo los resultados de distintas pruebas de laboratorio realizadas a la materia prima. Con base en estos resultados, se ilustran las ventajas de diseñar a la mampostería con base experimental en lugar de utilizar los valores indicativos que se ofrecen en las normas de mampostería.Palabras clave: mampostería; piezas de concreto; resistencia a la compresión. Proposta de melhoria de traços para produzir blocos de alvenaria de concreto utilizando materiais comumente disponíveis no Vale do México RESUMOApresenta-se um estudo onde se propõe uma atualização dos valores do índice de resistência à compressão da alvenaria (f*m) elaborados com blocos de concreto especificados nas normas de alvenaria em vigor no Distrito Federal. Foi realizado um estudo de mercado, que levou em conta as características dos materiais comumente utilizados atualmente no Vale do México para a fabricação de blocos de concreto sólidos, incluindo os resultados de vários testes de laboratório nas matérias-primas disponíveis. Com base nestes resultados, são apresentadas as vantagens de projetar a alvenaria com base experimental em lugar de usar os valores indicativos oferecidos nas normas de alvenaria.Palavras chave: alvenaria; blocos de concreto; resistência à compressão.

scholarly journals Failure analysis and damage detection of partially grouted masonry walls by enhancing deformation measurement using DIC

2017 ◽  
Vol 134 ◽  
pp. 262-275 ◽  
Author(s):  
M. Bolhassani ◽  
A.A. Hamid ◽  
S. Rajaram ◽  
P.A. Vanniamparambil ◽  
I. Bartoli ◽  
...  
Keyword(s):  
Failure Analysis ◽  
Damage Detection ◽  
Deformation Measurement ◽  
Masonry Walls

Modeling and experimental implementation of infrared thermography on concrete masonry structures

2015 ◽  
Vol 69 ◽  
pp. 228-237 ◽  
Author(s):  
Fuad Khan ◽  
Mohammad Bolhassani ◽  
Antonios Kontsos ◽  
Ahmad Hamid ◽  
Ivan Bartoli
Keyword(s):  
Infrared Thermography ◽  
Masonry Structures ◽  
Concrete Masonry ◽  
Experimental Implementation

Design and Construction of Hybrid Concrete-Masonry Structures Informed by Cyclic Tests

2016 ◽  
Vol 32 (4) ◽  
pp. 2337-2355 ◽  
Author(s):  
Laura Redmond ◽  
Lawrence Kahn ◽  
Reginald DesRoches
Keyword(s):  
Reinforced Concrete ◽  
Seismic Performance ◽  
Masonry Structures ◽  
Cyclic Tests ◽  
Reinforced Concrete Frame ◽  
Masonry Infill ◽  
Concrete Frame ◽  
Concrete Masonry ◽  
Dowel Connections ◽  
Design And Construction

Reinforced concrete buildings with masonry infill are vulnerable in earthquakes primarily because the masonry walls often fail due to out-of-plane forces and can trigger soft-story collapses. In order to prevent these failures, many engineers in the Caribbean have partially reinforced the infill walls and connected them to the reinforced concrete frame. This forms a hybrid concrete-masonry structure. Hybrid concrete-masonry structures have the potential to improve the seismic performance of many structures across the globe, as they are an easy adaptation from traditional unreinforced masonry infill. However, there is little codified guidance for this type of structure, and the influence of the masonry infill and dowel connections on the in-plane behavior of the frame is often neglected. This paper summarizes the current design and construction practices for hybrid concrete-masonry structures and assesses their seismic performance via cyclic tests on full scale test specimens. Based on the results of the experiment, a method is proposed to account for the dowel connections and the partially reinforced infill when designing hybrid concrete-masonry structures in earthquake zones.

scholarly journals Damage Identification of Unreinforced Masonry Panels Using Vibration-Based Techniques

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Claudio Oyarzo-Vera ◽  
Nawawi Chouw
Keyword(s):  
Spatial Distribution ◽  
Damage Detection ◽  
Numerical Simulations ◽  
Damage Identification ◽  
Unreinforced Masonry ◽  
Masonry Structures ◽  
Damage Distribution ◽  
Modal Response ◽  
Damage States ◽  
Damage Indicators

Several damage indicators based on changes in modal properties validated for homogeneous materials were applied to detect damage in an unreinforced masonry cantilever panel. Damage was created by a “clean diagonal cut” at the center of the specimen which length was progressively extended towards the specimen’s corners. Numerical simulations were employed to determine the modal response at several damage states and this data was used to calculate the damage indicators. Those indicators presenting a good performance were then applied to identify damage on a physical specimen tested in the laboratory. The outcomes of this study demonstrated that vibration-based damage detection in unreinforced masonry structures can be satisfactorily performed. However, the identification of the damage spatial distribution using vibration-based methods in unreinforced masonry structures is still difficult. To improve the prediction of damage distribution, a large number of measurement points need to be considered to obtain an acceptable level of resolution.

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