Análisis costo -beneficio del uso de hormigón de alta resistencia (f’c=45 MPa) versus hormigón de normal (f’c=28 MPa), en un edificio de 15 pisos ,en la ciudad de Quito

Abstract

The objective of this study was to carry out a cost-benefit analysis of the use of high-strength concrete (f’c = 45 [MPa]) versus normal concrete (f’c = 28 [MPa]), in a medium-rise building (15 floors) for apartments. The structural configuration that was used corresponds to the system of special earthquake-resistant frame, with dropped beams structural walls (Dual System) of reinforced concrete. Additionally, a lower-rise building (8 floors) was analyzed for offices made up of a structural configuration of special earthquake resistant frames formed by columns and dropped beams.

For the study, a typical architectural design was proposed for departments and offices, representative for the construction of buildings in the city of Quito. The apartment building is made up of 3 basements, a ground floor and 15 floors above ground level, while the office building has 2 basements, a ground floor and 8 floors above ground level.

Each structure was made with normal concrete (HN) and high resistance concrete (HAR), so that 4 structural models were used. With the help of the Etabs® computer software, a linear (DBF) and a non-linear (Pushover) analysis was performed, which allowed to verify the behavior of each structure. To later carry out its structural design based on the provisions of ACI 318S-14 (Regulation for Structural Concrete), and NEC-15 (Ecuadorian Construction Norm-15), so that the structures present a favorable earthquake resistant behavior against seismic forces throughout its useful life. Finally, the structural plans were prepared, to carry out the cost analysis of reinforcing steel and concrete, being the most relevant materials.