Tesis de Postgrado Acceso Abierto
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Thesis AMPLIFICACIÓN EN SUELO BLANDO EN CONCEPCIÓN(2017) Bonilla Álvarez, Karolay Alejandra; Departamento de Obras Civiles; Bonelli C., PatricioReinforced concrete buildings structured with walls and founded on firm soilhada good performance in the 2010 Maule earthquake in Chile, however, some buildingslocated in places like Concepcion and Viña del Mar, where the bedrock is deeperthan 100 meters suffered damage in their walls.Assessments of damaged buildings in Concepcion have concluded that the damageobserved must have occurred at lateral displacements of 0:5% to 1:0% of theheight of the building, with brittle behavior, with the possible demand for displacementclose to 1:2% a 1:5% of the height, being required supply ductility to resistthe earthquake in a satisfactory way.The 2010 Maule earthquake was recorded by the acelerometers network of theUniversity of Chile (Renadic) and by the National Seismological Center of the Universityof Chile (CSN),the records obtained are mainly on landfi lls, with few recordson rock.Due to the absence of sufficient earthquake records in areas with soft soils andwhere there was greater damage, the equivalent linear method is evaluated in thecity of Concepcion, where there is a registry in these conditions, comparing the resultsobtained with this one-dimensional theory with what was recorded during theearthquake.The equivalent linear method is used by several authors because of the ease andspeed of its application. In this report, this method is used to obtain soil movementon the surface of a soft soil stratum by comparing the results using dierent rockoutcropping motion. The Rapel and Valparaiso records were used, which were obtainedon rock outcrops, both distant records to the city of Concepcion.It was determined that the choice of the movement considered in the bedrockstrongly aects the movement generated on the surface, with greater dierences inthe ordinates around the soil period. Therefore, for future ampli cation studies, it isnecessary to have rock stations close to soft soils areas.On the other hand, the Concepcion registry has been useful to interpret the damageoccurred in buildings of reinforced concrete of medium height constructed inthat area. This work evaluates the ampli cation of the soil and the variation of thefrequency content during the earthquake. In order to compare the ampli cation thatoccurs in the soft soil of Concepcion, the record of San Pedro de la Paz is used,where the bedrock is located at a depth between 25 to 40 meters, and the registryof Valparaso UTFSM which corresponds to a rock outcrop. The displacement anddisplacement spectra are compared for each record.The obtained results can be extrapolated to places where the rock is at a similardepth, the record obtained in San Pedro represents areas where the basal rock islocated at a depth between 25 and 40 meters, with ceiling shifts of the order of 0:7%of height. The results obtained with Concepcion can be extrapolated to areas wherethe bedrock is more than 100 meters deep. Precautions should be taken to limitlateral displacements and provide ductility in structures built on this type of soilconditions.
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