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Masonry Walls (masonry + wall)

Distribution by Scientific Domains
Engineering100%
Distribution within Engineering
General & Introductory Civil Engineering & Construction42%
Numerical Methods & Algorithms28%

Selected Abstracts

Reserved Strength of Reinforced Concrete Buildings with Masonry Walls

COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING, Issue 3 2005
Nasreddin S. El Mezaini
In this building, damage was limited to some cracks in the walls near the targeted zone. Other parts of the building remained intact. The building was analyzed using two different models. In one model, masonry walls were treated as nonstructural elements represented by applied loads. In the other model, walls were represented by membrane elements connected to concrete frames by link elements. Analysis was carried out for two cases, before and after damage. The study revealed that such buildings possess potential reserved strength. They have the ability to change their designated load path. The role of masonry walls is emphasized. In this case, masonry walls worked as a backup system that prevented major collapse of the building. It is estimated that, under normal conditions, masonry walls increase the building strength by 48%. [source]

2D modelling of a dry joint masonry wall retaining a pulverulent backfill

INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, Issue 12 2010
A. S. Colas
Abstract This work focuses on an analysis of dry joint retaining structures based on yield design theory: the stability of the masonry is assessed using rigid block and shear failure mechanisms in the wall and its backfill. An application of this simulation on 2D scale-down brick and wood models is then addressed, showing close agreement between theoretical predictions and experimental results. Further development on this work, including application of this theory on dry-stone retaining walls, is discussed as a conclusion. Copyright © 2009 John Wiley & Sons, Ltd. [source]

Combining interface damage and friction in a cohesive-zone model

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 5 2006
Giulio Alfano
Abstract A new method to combine interface damage and friction in a cohesive-zone model is proposed. Starting from the mesomechanical assumption, typically made in a damage-mechanics approach, whereby a representative elementary area of the interface can be additively decomposed into an undamaged and a fully damaged part, the main idea consists of assuming that friction occurs only on the fully damaged part. The gradual increase of the friction effect is then a natural outcome of the gradual increase of the interface damage from the initial undamaged state to the complete decohesion. Suitable kinematic and static hypotheses are made in order to develop the interface model whereas no special assumptions are required on the damage evolution equations and on the friction law. Here, the Crisfield's interface model is used for the damage evolution and a simple Coulomb friction relationship is adopted. Numerical and analytical results for two types of constitutive problem show the effectiveness of the model to capture all the main features of the combined effect of interface damage and friction. A finite-step interface law has then been derived and implemented in a finite-element code via interface elements. The results of the simulations made for a fibre push-out test and a masonry wall loaded in compression and shear are then presented and compared with available experimental results. They show the effectiveness of the proposed model to predict the failure mechanisms and the overall structural response for the analysed problems. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Reserved Strength of Reinforced Concrete Buildings with Masonry Walls

COMPUTER-AIDED CIVIL AND INFRASTRUCTURE ENGINEERING, Issue 3 2005
Nasreddin S. El Mezaini
In this building, damage was limited to some cracks in the walls near the targeted zone. Other parts of the building remained intact. The building was analyzed using two different models. In one model, masonry walls were treated as nonstructural elements represented by applied loads. In the other model, walls were represented by membrane elements connected to concrete frames by link elements. Analysis was carried out for two cases, before and after damage. The study revealed that such buildings possess potential reserved strength. They have the ability to change their designated load path. The role of masonry walls is emphasized. In this case, masonry walls worked as a backup system that prevented major collapse of the building. It is estimated that, under normal conditions, masonry walls increase the building strength by 48%. [source]

Determination of mechanical properties of traditional masonry walls in dwellings of Faial Island, Azores

EARTHQUAKE ENGINEERING AND STRUCTURAL DYNAMICS, Issue 7 2002
Aníbal Costa
Abstract The determination of mechanical properties of masonry walls is a fundamental pre-requisite for the characterization of the seismic response of traditional buildings, which helps on the definition of adequate rehabilitation and strengthening procedures. This paper presents a testing campaign carried out in the Cedros region of Faial Island, Azores, hit by the July 98 earthquake, aiming at the determination of physical and mechanical properties of stone masonry walls, namely the mass density and Young's modulus. The paper describes the developed testing techniques as a contribution to the study and the preservation of traditional masonry buildings. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Hygrothermische Beanspruchung und Lebensdauer von Wärmedämm-Verbundsystemen

BAUPHYSIK, Issue 3 2006
Leiter Abt.
Das Alterungsverhalten und die Lebensdauer von Fassadensystemen wird stark von der hygrothermischen Beanspruchung beeinflußt. Neben den Witterungsbedingungen Temperatur, Strahlung und Luftfeuchte wirken häufig auch noch äußere oder innere Feuchtequellen, z. B. Schlagregen, Baufeuchte oder Oberflächenbetauung auf Außenwände ein. Wegen ihrer geringen Masse sind Wärmedämm-Verbundsysteme (WDVS) davon z. T. besonders betroffen. Dennoch zeigt die Langzeitstudie an Objekten mit WDVS, daß damit keine erhöhte Schadensanfälligkeit verbunden ist. Abgesehen von einigen optischen Mängeln ist das Langzeitverhalten von WDVS als sehr positiv zu bewerten. Bei regelmäßiger Wartung entspricht die Lebensdauer von WDVS der von herkömmlich verputzten Außenwänden. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) Hygrothermal loads and service life of external wall insulation systems. Service life and aging behaviour of external wall systems depend on their hygrothermal loads. Apart from the fluctuating climatic conditions temperature, solar radiation and humidity there are often additional exterior or interior sources of moisture, e.g. driving rain, construction moisture or surface condensation acting on facades. External wall insulation systems (ETICS = E xternal T hermal I nsulation C omposite S ystems) are especially affected due to their low mass. However, the long-term observation by repeated inspections of the same objects over a period of 30 years proves that ETICS show not more damage than traditional facades. Apart from minor esthetical problems due to soiling or microbial growth their long-term behaviour is very encouraging. Maintained at normal intervals ETICS are as durable as traditionally rendered masonry walls. [source]