Seismic answer of special steel porches considering the system of gravity and flexibility of the base of the columns

High ductility and architectural versatility makes special steel (PEA) porches be one of the most used resistant earthquake systems in buildings. In the investigative world in the structural area, the evaluation of the collapses of these structures is typically made without considering two important characteristics: 1) Service system and 2) The real flexibility of the base of the columns which are normally considered recessed or articulated. This study evaluates the seismic behavior of PEA of buildings of 2, 4, and 8 floors, which will be analyzed considering the effects of the flexibility of the columns base and the incorporation of the system of gravity. The flexibility of the base of the columns is included using models that add the deformations of different components of the base. On the other hand, gravity system is included modeling the continuity of the columns and the resistance of the connections. The evaluation of the systems is carried out using the P-695 FEMA methodology which, through static and dynamic non-linear analysis, establishes the collapse probability of each building. Non-linear dynamic analyzes are carried out by subjecting each structure to an estimated analysis number that is around 500 and the duration of each earthquake is estimated in 5 hours. The main objective of the study is to establish whether the harmful effects that the bases of the flexible columns have can be counteracted by the gravity system.

XVII UNIVERSITY COMPETITION FOR RESEARCH PROJECTS