Destructive Tests for the Determination of Masonry Performance

2009 ◽  
Vol 417-418 ◽  
pp. 753-756
Author(s):  
Lucio Nobile ◽  
Cristina Gentilini ◽  
Veronica Bartolomeo ◽  
Mario Bonagura
Keyword(s):  
Mechanical Properties ◽  
Experimental Research ◽  
State Of The Art ◽  
The State ◽  
Masonry Walls ◽  
Compression Tests ◽  
Diagonal Compression

Several masonry panels are studied by means of destructive tests such as compressive, diagonal compression and shear-compression tests. The experimental research allows to characterize the mechanical properties of masonry walls in order to assess the masonry performance. Moreover, a brief recall of the most important experimental progress is presented in order to understand the state of the art of the research in the field of destructive tests.

Problem of angular motion control of a non-cooperative on-orbit service object

2021 ◽  
Vol 2021 (1) ◽  
pp. 37-50
Author(s):  
A.A. Fokov ◽  
◽  
O.P. Savchuk ◽  
Keyword(s):  
Motion Control ◽  
State Of The Art ◽  
Object Motion ◽  
The State ◽  
Angular Motion ◽  
Motion Parameter ◽  
Rotary Motion ◽  
Parameter Determination ◽  
Service Object

The realization of existing projects of on-orbit servicing and the development of new ones is a steady trend in the development of space technology. In many cases, on-orbit service clients are objects that exhibit an undesired rotary motion, which renders their servicing difficult or impossible. The problem of on-orbit service object motion control determines the topicality of studies aimed not only at the refinement of methods and algorithms of controlling both the translational and the rotary motion of an object, but also at the development and refinement of methods of onboard determination of the object – service spacecraft relative motion parameters. This paper overviews the state of the art of the problem of object motion parameter determination in on-orbit servicing tasks and existing methods of object motion control and angular motion damping and specifies lines of further investigations into the angular motion control of non-cooperative service objects. Based on the analysis of publications on the subject, the applicability of onboard means for object motion parameter determination is characterized. The analysis of the applicability of methods of remote determination of the parameters of an unknown non-cooperative object from a service spacecraft shows that they are at the research stage. The input data for the verification of methods proposed in the literature were simulated or taken from ground experiments or previous missions. Contact and contactless methods of angular motion control of non-cooperative on-orbit service objects are considered. From the state of the art of investigations into the contactless motion control of on-orbit service objects it may be concluded that the most advanced contactless method of motion control of an on-orbit service object is a technology based on the use of an ion beam directed to the object from an electrojet engine onboard a service spacecraft. Lines of further investigations into non-cooperative object motion control are proposed.

scholarly journals The Effect of Transversal Connection in the in-Plane Response of Double-Leaf Brick Masonry Walls

2021 ◽  
Author(s):  
Lorenzo Scandolo ◽  
Stefano Podestà
Keyword(s):  
Structural Safety ◽  
Masonry Walls ◽  
Masonry Building ◽  
Mechanical Parameters ◽  
Compression Tests ◽  
Knowledge Process ◽  
Diagonal Compression ◽  
Set Up ◽  
Definition Of ◽  
Simplified Mechanical Model

Abstract The evaluation of structural safety derives from the knowledge of material properties. In case of existent masonry building, the definition of reliable mechanical parameters could be a very difficult task to be achieved. For this reason, an estimation of these values is useful, for example it is the first phase of the knowledge process, for simplified mechanical model or when NTD test is the only possibility.The transversal connection in masonry panels is a technological detail that affects the static and seismic behavior and could significantly increase the strength of the element.In this paper the effect of transversal connection in double-leaf brickwork masonry panels is evaluated by diagonal compression tests. To achieve this goal, a new set-up was designed to load each leaf independently.The results have shown an increment of about 20% in strength if transversal connection is present. If the leaves have very different mechanical parameters, the tests highlight an unexpected behavior.

FRCM Strengthened Masonry Panels: The Role of Mechanical Anchorages and Symmetric Layouts

2017 ◽  
Vol 747 ◽  
pp. 334-341 ◽  
Author(s):  
Francesca Ferretti ◽  
Andrea Incerti ◽  
Barbara Ferracuti ◽  
Claudio Mazzotti
Keyword(s):  
Masonry Walls ◽  
Fiber Reinforced ◽  
Compression Tests ◽  
Fiber Reinforced Composite ◽  
Single Leaf ◽  
Reinforced Composite ◽  
Experimental Campaign ◽  
Diagonal Compression ◽  
Strength And Ductility

The use of fiber reinforced composite materials for the retrofitting of existing masonry buildings is investigated in this paper. Indeed, they represent a great alternative to traditional strengthening techniques for the improvement of the seismic performance of masonry walls. Focusing on the in-plane behavior of masonry, an experimental campaign is here presented with the objective of studying the efficiency of different strengthening solutions. Diagonal compression tests were conducted on single-leaf masonry panels reinforced with Fiber Reinforced Cementitious Matrix (FRCM) using different fibers typologies and layouts. Glass or carbon fiber grids embedded in a lime-based mortar matrix were applied on one or both sides of masonry panels, with or without mechanical anchorages. The comparison of the different strengthening techniques is analyzed in terms of failure mode, strength and ductility. The results are then discussed considering the provisions and design formula proposed for FRP strengthening by the Italian CNR Guidelines.

Evaluation of Micro-Pillar Compression Tests for Accurate Determination of Elastic-Plastic Constitutive Relations

2012 ◽  
Vol 79 (6) ◽  
Author(s):  
Huiyang Fei ◽  
Amit Abraham ◽  
Nikhilesh Chawla ◽  
Hanqing Jiang
Keyword(s):  
Mechanical Properties ◽  
Finite Element Analysis ◽  
Compression Test ◽  
Constitutive Relations ◽  
Accurate Determination ◽  
Compression Tests ◽  
Element Analysis ◽  
Plastic Materials ◽  
Properties Of Materials

The micro-pillar compression test is emerging as a novel way to measure the mechanical properties of materials. In this paper, we systematically conducted finite element analysis to evaluate the capability of using a micro-compression test to probe the mechanical properties of both elastic and plastic materials. We found that this test can provide an alternative way to accurately and robustly measure strain, and to some extent, stress. Therefore, this test can be used to measure some strain related quantities, such as strain to failure, or the stress-strain relations for plastic materials.

The Analysis of Depth-Sensing Indentation Data: Review of the Special Discussion Session

1993 ◽  
Vol 308 ◽  
Author(s):  
Shefford P. Baker ◽  
T.P. Weihs
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
State Of The Art ◽  
The State ◽  
Discussion Session ◽  
Depth Sensing ◽  
Recent Advances

In light of recent advances in the analysis of depth-sensing indentation data and of the importance of this technique in the study of the mechanical properties of thin films, a special discussion session was held in order to explore the state of the art and to provide an informal forum for discussion. This is a brief review of that discussion. The discussion was focused by the four main sources of deviation from model behavior described in the previous paper.

scholarly journals Compilación y análisis de la Literatura Kogi

2012 ◽  
Vol 9 ◽  
pp. 9
Author(s):  
Zulma Martínez Preciado ◽  
Liliana Moreno Muñoz
Keyword(s):  
Key Words ◽  
Representative Sample ◽  
State Of The Art ◽  
The State ◽  
Literary Production ◽  
Indigenous Literature ◽  
Palabras Clave ◽  
Literature Anthologies ◽  
Myth Criticism

Resumen:El artículo, visibiliza el potencial simbólico de algunas formas compositivas Kogi, que se abren paso en el panorama de la literatura indígena colombiana. Para ello, se recopilaron textos teóricos, críticose investigativos; así como antologías de literatura kogi, y se hizo el análisis a partir de la mitocrítica. Las fases fundamentales del proyecto fueron: indagación acerca del estado del arte respecto a la literatura kogi; recopilación de producción literaria kogi y determinación de formas compositivas y funciones; y selección y análisis de una muestra representativa de la producción literaria kogi, en la que se tuvieron en cuenta algunos motivos arquetípicos recurrentes. Palabras clave: literatura indígena colombiana, kogis, literatura kogi, cultura kogi, mitocrítica, motivos arquetípicos.Resumo:O artigo faz visível o potencial simbólico de algumas formas compositivas Kogi que ganham espaço no panorama da literatura indígena colombiana. Para isso foram recopilados textos teóricos, críticos e investigativos, assim como antologias de literatura Kogi, e foi feita a análise partindo da microcrítica. As fases fundamentais do projeto foram: indagação sobre o estado da arte respeito à literaturaKogi, recopilação de produção literária Kogi e determinação de formas compositivas e funções; e seleção e análise de uma mostra representativa da produção literária Kogi, na qual foram tidos comconsideração alguns motivos arquetípicos. Palavras chave: literatura indígena colombiana, kogis, literatura kogi, cultura kogi, microcrítica, motivos arquetípicos.Abstract:The article, makes visible the symbolic potential of some Kogi compositional forms that make their way  into the landscape of the Colombian indigenous literature. To do this, we collected theoretical texts, critical and research as well as literature anthologies kogi, and the analysis was based on the myth criticism. The key stages of the project were: inquiry about the state of the art with respect to literature kogi; kogi literary collection and determination of compositional forms and functions; and selection and analysis ofa representative sample of kogi literary production, in wich took into account some recurring archetypal motifs. Key words: Colombian indigenous literature, kogis, kogi literature, kogi culture, myth criticism, archetypal motifs.

Relation Between Full-Scale and Model Data

2020 ◽  
Author(s):  
Horia Hangan ◽  
Maryam Refan ◽  
Djordje Romanic
Keyword(s):  
Numerical Simulations ◽  
State Of The Art ◽  
Full Scale ◽  
The State ◽  
Reduced Model ◽  
Model Data ◽  
Model Simulations ◽  
Velocity Scale ◽  
Scale Data

This chapter introduces recent results aiming to compare full-scale data and simulations of tornadoes and to establish a framework through which simulations of tornado-like vortices (both physical and numerical) can be compared to full-scale data. Physical and sometimes numerical simulations of non-synoptic winds such as tornadoes and downbursts are performed at a reduced (model) scale (Λl) compared to reality (prototype). That approach implies that there is also a timescale (Λt) and a velocity scale (Λv) involved, and the three of them are interlinked. The proper determination of these scales is critical in the process of translating results from model simulations to reality. This chapter discusses the state of the art of determining these scales for two types of non-synoptic winds—tornadoes and downbursts.

Comparison of In-Plane Mechanical Performances of Masonry Walls Strengthened with Different Mortar Coatings Reinforced with Glass or Carbon Fiber Composite Meshes

2017 ◽  
Vol 747 ◽  
pp. 289-297 ◽  
Author(s):  
Natalino Gattesco ◽  
Ingrid Boem
Keyword(s):  
Carbon Fibers ◽  
Coating Layer ◽  
Fiber Composite ◽  
Shear Stiffness ◽  
Masonry Walls ◽  
Compression Tests ◽  
Carbon Fiber Composite ◽  
Diagonal Compression ◽  
Mechanical Performances ◽  
Compression Resistance

The results of some diagonal compression tests performed on solid brick masonry samples (1160x1160x250 mm3) to evaluate and compare the effectiveness of different shear reinforcement techniques for existing masonry based of the application, on both sides of the wall, of a mortar coating layer reinforced with fiber composite meshes are presented and discussed in the paper. In particular, 30 mm and 10 mm thick mortar coatings, made of three different mortar types and reinforced by means of both glass and carbon-fibers composite meshes were considered. Significant resistance increases (about 110%) were attained in respect to plain masonry; moreover, it emerged that the meshes are able to prevent the masonry brittle collapse, absorbing tensile stresses in the cracked areas. By maintaining constant the coating thickness, better mortar characteristics determined an increase of the resistance increment ratio but a more rapid decrease of resistance after peak. Similar performances were attained by samples characterized by approximately constant values of shear stiffness and diagonal compression resistance. The differences attributable to the different type of meshes resulted minimal, due to the similar reinforcement percentage.

Experimental Determination of Mechanical Properties of Aluminium Foams Using Digital Image Correlation

2014 ◽  
Vol 601 ◽  
pp. 254-257 ◽  
Author(s):  
Tudor Voiconi ◽  
Emanoil Linul ◽  
Liviu Marsavina ◽  
Jaroslav Kováčik ◽  
Marcin Kneć
Keyword(s):  
Mechanical Properties ◽  
Digital Image Correlation ◽  
Yield Stress ◽  
Digital Image ◽  
Compressive Loading ◽  
Image Correlation ◽  
Compression Tests ◽  
Closed Cell

This paper presents an experimental characterization of three different types of closed-cell aluminium alloy foams (AlMg1Si0.6, AlSi12Mg0.6 and AlMg0.6Si0.3) under static compressive loading. This study was carried out on half-cylindrical specimens with skin. The influence of foam density on compressive behaviour was investigated for densities ranging from 430 kg/m3 to 935 kg/m3. The compression tests were performed at room temperature (23°C) with a constant crosshead speed of 0.5 mm/min. Strain distribution, yield stress and compressive modulus values were recorded using Digital Image Correlation. Experimental results show that the mechanical properties (Youngs Modulus, yield stress and plateau stress) increase with density.

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