Comparación de las normas ASCE 7-10 y nNEC-2015 en el diseño sísmico con aplicación a pórticos especiales con y sin muros estructurales

Abstract

Ecuador is a country that has suffered from earthquakes during its history, and due to that it has developed its own standard for the design of seismic-resistant buildings based on different international standards, being the American ASCE7-10 one of its main sources. The importance of a standard that meets the requirements to safeguard life without overestimating seismic effects, is essential for safe and economically viable structures. In order to establish the rigor of the Ecuadorian standard, in this study its compared with the US standard in the design of a regular building of 12 levels of reinforced concrete by the static method of equivalent lateral forces. This comparison was carried out using the moment resisting frame system and the structural wall system, in addition a variation of the moment resisting frame system was analyzed, where only the perimeter frames resist side loads and the interior frames only withstand gravity loads. It was possible to verify for the two systems that the US standard is more rigorous in the limb resistance design while the forces used in the drift control are considerably smaller, these differences do not produce a considerable impact on the gantry system, while for the walls the difference is more marked. The system of perimeter frames did not present benefits by saving concrete, nevertheless the internal sections to gravity are considerably smaller, that being an advantage from the architectonic point of view