983 research outputs found
Estudio experimental del Sistema de AlbañilerÃa Integral en la construcción de viviendas sismorresistentes. Experimental study of the Integral Masonry System in the construction of earthquake resistant houses
This paper presents the application of the Integral
Masonry System (IMS) to the construction of earthquake
resistant houses and its experimental study. To verify the
security of this new type of building in seismic areas of
the third world two prototypes have been tested, one
with adobe and the other with hollow brick. In both
cases it’s a two-story 6x6x6 m3 house built to scale 1/2.
The tests are carried out at the Laboratory of Antiseismic
Structures of the Department of Engineering,
Pontifical Catholic University of Peru in Lima, in
collaboration with the UPM (Technical University of
Madrid).
This article shows the design process of the prototypes to
test, including the sizing of the reinforcements, the
characteristics of the tests and the results obtained. These
results show that the IMS with adobe or brick remains
stable with no significant cracks faced with a severe
earthquake, with an estimated acceleration of 1.8 g.
Este artÃculo presenta una aplicación del Sistema de
AlbañilerÃa Integral (SAI) a la construcción de viviendas
sismorresistentes y su estudio experimental. Para verificar
su seguridad para su construcción en zonas sÃsmicas
del tercer mundo se han ensayado dos prototipos, uno
con adobe, y otro con ladrillo hueco. Se trata de una
vivienda de 6x6x6 m3 y dos plantas que se construyen a
escala 1/2. Los ensayos se realizaron en el Laboratorio
de Estructuras AntisÃsmicas del Departamento de IngenierÃa
de la Pontificia Católica Universidad del Perú (PUCP)
de Lima en colaboración con la UPM (Universidad Politécnica
de Madrid).
Este artÃculo muestra el proceso de diseño de los prototipos
a ensayar, incluido el dimensionado de los refuerzos,
las caracterÃsticas de los ensayos y los resultados
obtenidos. Estos resultados muestran que el SAI con
adobe o ladrillo permanece estable sin grietas significativas ante un sismo severo, con una aceleración estimada
de 1,8 g
Formation of Epitaxial MnBi Layers on (Ga,Mn)As
The initial growth of MnBi on MnAs terminated (GaMn)As is studied by means of
synchrotron based photoelectron spectroscopy. From analysis of surface core
level shifts we conclude that a continued epitaxial MnBi layer is formed, in
which the MnAs/MnBi interface occurs between As and Bi atomic planes. The well
defined 1x2 surface reconstruction of the MnAs surface in preserved for up to 2
ML of MnBi before clear surface degradation occurs.Comment: 18 pages, 5 figure
Influence of annealing parameters on the ferromagnetic properties of optimally passivated (Ga,Mn)As epilayers
The influence of annealing parameters - temperature and time - on the
magnetic properties of As-capped (Ga,Mn)As epitaxial thin films have been
investigated. The dependence of the transition temperature (Tc) on annealing
time marks out two regions. The Tc peak behavior, characteristic of the first
region, is more pronounced for thick samples, while for the second
(`saturated') region the effect of the annealing time is more pronounced for
thin samples. A right choice of the passivation medium, growth conditions along
with optimal annealing parameters routinely yield Tc-values of ~ 150 K and
above, regardless of the thickness of the epilayers.Comment: 5 pages, 3 figure
Aproximación a la diferenciación social del espacio interior urbano en la ciudad de Murcia.
Sin resume
Post-growth annealing of GaMnAs under As capping - an alternative way to increase Tc
We demonstrate that in situ post-growth annealing of GaMnAs layers under As
capping is adequate for achieving high Curie temperatures (Tc) in a similar way
as ex situ annealing in air or in N2 atmosphere practiced earlier.Comment: 13 pages, 4 figure
Generalized Jacobi–Weierstrass operators and Jacobi expansions
We present a realization for some K-functionals associated with Jacobi expansions in terms of generalized Jacobi–Weierstrass operators. Fractional powers of the operators as well as results concerning simultaneous approximation and Nikolskii–Stechkin type inequalities are also considered
Sistema de autoconstrucción sismorresistente: caracterÃsticas resistentes y proceso constructivo
The dwelling construction with soil, adobe or brick without call for technical advice is very typical in countries in process of development that are in areas of high seismic risk. To give an answer to the problem of earthquake building using these materials, providing simplicity of construction, we have worked for years in the use of the Integral Masonry System (IMS).
The IMS is a system that, used combined with native materials, has earthquake resistant properties and its ease of implementation makes it suitable for self-build earthquake-resistant dwellings.
This article describes the IMS, develops the constructive process applied to a type of two storey houses, and shows the seismic behaviour by means of the results obtained in the three test campaigns. The originality of the system lies in the use of a single type of prefabricated trusses, intertwined in the three spatial directions allowing create a dimensional mesh.<br><br>La autoconstrucción con tierra, adobe o ladrillo es muy habitual en los paÃses en vÃas de desarrollo que están en zonas de alto riesgo sÃsmico. Ante la necesidad de dar respuesta al problema, aportando sencillez constructiva, hemos trabajado desde hace años en el empleo del Sistema de AlbañilerÃa Integral (SAI).
El SAI es un sistema que, combinado con materiales autóctonos, aporta resistencia sÃsmica y su facilidad de ejecución lo hace adecuado para la autoconstrucción de viviendas antisÃsmicas.
Este artÃculo describe el SAI, desarrolla el proceso constructivo aplicado a una vivienda tipo de dos alturas y muestra su comportamiento sismo-resistente mediante los resultados obtenidos en tres campañas de ensayos. La originalidad del sistema radica en el empleo de un solo tipo de armaduras prefabricadas en forma de cercha que se entrelazan entre si en las tres direcciones del espacio permitiendo crear una malla tridimensional
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