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Strains on steel reinforcement of low-rise concrete walls during shake table tests
Deformaciones del acero de refuerzo, durante ensayos en mesa vibratoria con muros de concreto de baja altura
Keywords:
concrete wall, lowrise housing, shake table test, steel strain, welded-wire mesh, yielding (en)muro de concreto, vivienda de baja altura, ensayo en mesa vibratoria, deformación del acero, malla electrosoldada, fluencia (es)
During the last few decades, several advantages of concrete wall housing have been identified when compared with masonry houses located in high hazard seismic zones; for instance, higher lateral stiffness and strength, and higher ductility capacity. Therefore, construction of low-rise housing units using reinforced concrete shear walls has become a preferred choice and consequently, its use has increased considerably in many Latin American countries. The aim of this study is to experimentally assess the strains on steel reinforcement of concrete walls for low-rise housing when subjected to seismic actions. The experimental program was comprised of six concrete wall specimens tested under shake table excitations. An efficiency factor was used to reflect the amount of wall reinforcement at yielding. Trends of measured results were compared with the recommendations proposed by the ACI 318-11 Building Code. Results of this study can be used as a suitable tool to evaluate the contribution of reinforcement to the shear strength and displacement capacity of concrete walls for low-rise housing.
Durante las últimas décadas se han identificado varias ventajas de las viviendas con muros de concreto, cuando éstas se comparan con viviendas de mampostería localizadas en zonas de amenaza sísmica alta; por ejemplo, mayor rigidez lateral y resistencia y mayor capacidad de ductilidad. Por lo tanto, la construcción de viviendas de baja altura usando muros de cortante con concreto reforzado se ha convertido en una opción preferida y de esta manera, su uso se ha incrementado considerablemente en muchos países de América Latina. El objetivo de este estudio es evaluar experimentalmente las deformaciones del acero de refuerzo de muros de concreto para vivienda de baja altura sometidos a acciones sísmicas. El programa experimental comprendió seis especímenes de muros de concreto ensayados bajo excitaciones en mesa vibratoria. Se utilizó un factor de eficiencia para reflejar la cantidad de refuerzo del muro en fluencia. Las tendencias de los resultados medidos fueron comparadas con las recomendaciones propuestas por el Reglamento de Construcción ACI 318-11. Los resultados de este estudio pueden utilizarse como una herramienta adecuada para evaluar la contribución del refuerzo a la resistencia y al desplazamiento de muros de concreto reforzado para vivienda de baja altura.
References
ACI Committee 318., Building code requirements for structural concrete (ACI-318) and commentary (ACI-318R)., Farmington Hills, MI, American Concrete Institute, 2011.
Carrillo, J., Alcocer, S., Seismic performance of concrete walls for housing subjected to shaking table excitations., Journal of Engineering Structures, Vol. 41, 2012, pp. 98-107.
Carrillo, J., Guzmán, A., Jerez, S., Reinforcement contribution to the behaviour of low-rise concrete walls., Latin American Journal of Solids and Structures, In Press, 2014.
NSR-10. Colombian code for earthquake-resistant construction., Colombia, Colombian Association of Earthquake Engineering, AIS, 2010.
Sánchez, A., Seismic behavior of housing with concrete walls., Technical Report, Institute of Engineering, National University of Mexico, UNAM, 2010 (in Spanish).
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Copyright (c) 2014 Julián Carrillo, Martha Sánchez-Cruz, Alvaro Viviescas
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