Análisis porticos del hormigón armado para uso en programas de vivienda

Abstract

The high demand for housing today generates a large number of housing projects where low and medium height buildings are built, but the economic resources are limited so that the institution or the construction and design contractor needs to make the Costs. The finishes are those that predominate in the total cost of a building, but an important factor in this type of constructions is to optimize the structural system. This paper analyzes only the structural system of reinforced concrete porticos, in order to determine the most economical and at the same time that its behavior in response to a seismic demand is efficient. The sample for the research is composed of 7 flat porches of 4, 7 and 10 floors, each one of them will have different number of columns to cover a same light (L = 50m). 21 flat porticos are obtained from 6 columns to porticos with 17 columns, and their lights vary from 3m to 10m, which allowed us to determine the optimal spacing between columns. The design of the structural elements is done according to ACI 318-02 and the seismic demand is obtained using the direct design based on displacement (DDBD) method. The performance of the frames was determined by a sample of 6 portals, which was verified by non-linear history analysis at time "ANHT" using eight accelerograms compatible with the design spectrum. In the end, it was verified that the porticos with the largest number of columns or smaller lights are more economical and behave quite satisfactorily in the same seismic demand. The details of the analyzes carried out and a summary of the results obtained are presented.