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La gran prioridad del ingeniero civil es brindar seguridad al ciudadano en cualquiera de las edificaciones y/o construcciones que este esta seguridad siempre debe estar ligada a obtener la infraestructura adecuada a un costo razonable. En nuestro país los proyectos de construcción, en particular las edificaciones que son nuestro caso en estudio, podrían durante un sismo, presentar diversos motivos de fallas, entre ellos, y en el que nos vamos a enfocar es en la falla producida por el contacto entre estructuras vecinas durante un movimiento sísmico. Consideramos que el rápido aumento de las edificaciones para uso residencial y la todavía existente informalidad en la construcción, han sido algunas de las razones que han generado que en el Perú existan edificaciones contiguas construidas sin una adecuada junta de separación sísmica, a pesar de que en el reglamento de construcción este indicado. Tomando en cuenta que el país se encuentra ubicado en una zona altamente sísmica, dichas edificaciones podrían ser severamente dañadas durante el evento de un movimiento sísmico. Es por tal motivo, que se busca conocer y analizar el efecto en las estructuras adyacentes de concreto armado de juntas de separación sísmicas inferiores a lo reglamentado, determinando la fuerza de impacto producida por el fenómeno de golpeo entre estructuras (pounding). Se considera que la información a obtenerse será de gran importancia, debido a la falta de investigaciones en idioma español en nuestro país sobre dicho fenómeno. Una vez determinada la fuerza de impacto entre las estructuras se esbozarán posibles soluciones que consideremos que podrían ayudar a mitigar el problema. / The main priority for a civil engineer is to provide security to citizens in any buildings and/or constructions he makes, this security always has to be linked to obtain the appropriate infrastructure at reasonable cost. In our country, construction projects specially buildings that are our case of study, could have many causes of failures during an earthquake, among them —and the one we will focus on— is the failure occurred by the contact between neighbor structures during a seismic activity. We consider the rapid increase of buildings for residential use and the yet existing informality in construction have been one of the reasons for generating constructed adjoining buildings without an appropriate seismic separation joints in Peru, in spite of the indications in the building code. Considering that the country is situated in a highly seismically unstable area, these buildings might be severely damaged during a seismic activity. For that reason, we want to discover and analyse the effect in the adjoining reinforced concrete structures of seismic separation joints below regulation, determining the impact force produced by the beating phenomenon between structures (pounding). The information that is going to be obtained is considered to be relevant, due to the lack of researches about this phenomenon in Spanish in our country. Once determined the impact force between structures, possible solutions that we consider might help attenuate the problem will be outlined. / Tesis

As the cost of land in cities increases, the need to build multistory buildings in close proximity to each other also increases. Sometimes, construction materials, other objects and any projections from a building may also decrease the spacing provided between the buildings. This leads to the problem of pounding of these closely placed buildings when responding to earthquake ground motion. The recent advent of base isolation systems and their use as an efficient earthquake force resisting mechanism has led to their increased use in civil engineering structures. At the same time, building codes that reflect best design practice are also evolving. The movement of these base isolated buildings can also result in building pounding. Since base isolation is itself a relatively new technique, pounding phenomenon in base isolated buildings have not been adequately investigated to date. This study looks at the base isolated response of a single two story building and adjacent two story building systems. Four earthquakes with increasing intensity were used in this study. It was found that it is difficult to anticipate the response of the adjacent buildings due to non- linear behavior of pounding and base isolation. The worst case for pounding was found to occur when a fixed base and base isolated buildings were adjacent to each other.

As the cost of land in cities increases, the need to build multistory buildings in close proximity to each other also increases. Sometimes, construction materials, other objects and any projections from a building may also decrease the spacing provided between the buildings. This leads to the problem of pounding of these closely placed buildings when responding to earthquake ground motion. The recent advent of base isolation systems and their use as an efficient earthquake force resisting mechanism has led to their increased use in civil engineering structures. At the same time, building codes that reflect best design practice are also evolving. The movement of these base isolated buildings can also result in building pounding. Since base isolation is itself a relatively new technique, pounding phenomenon in base isolated buildings have not been adequately investigated to date. This study looks at the base isolated response of a single two story building and adjacent two story building systems. Four earthquakes with increasing intensity were used in this study. It was found that it is difficult to anticipate the response of the adjacent buildings due to non- linear behavior of pounding and base isolation. The worst case for pounding was found to occur when a fixed base and base isolated buildings were adjacent to each other.