Improving the Seismic Performance of Steel Frames under Mainshock–Aftershock Using Post-Tensioned Connections

Author:

Torres José R.1,Bojórquez Edén1,Bojórquez Juan1ORCID,Leyva Herian2ORCID,Ruiz Sonia E.3ORCID,Reyes-Salazar Alfredo1,Palemón-Arcos Leonardo4,Rivera J. Luz1,Carvajal Joel1,Reyes Henry E.1

Affiliation:

1. Facultad de Ingeniería Culiacán, Universidad Autónoma de Sinaloa, Culiacán de Rosales 80040, Mexico

2. Facultad de Ingeniería, Arquitectura y Diseño (FIAD), Universidad Autónoma de Baja California, Ensenada 22860, Mexico

3. Instituto de Ingeniería, Universidad Nacional Autónoma de México, CU, Coyoacán, Cuidad de México 04510, Mexico

4. Departamento de Ingeniería Civil, Universidad Autónoma del Carmen, Cd. del Carmen, Campeche 24180, Mexico

Abstract

In this study, the seismic responses of moment-resisting steel frames (MRSFs) with welded and post-tensioned connections under 28 artificial seismic sequences (mainshock–aftershock) are compared. For this aim, the mainshock are scaled at different ground motion intensity levels as a function of the spectral pseudo-acceleration corresponding to the fundamental period of vibration of the structure Sa(T1), whereas different intensity levels of the aftershocks are used for a percentage of the peak maximum acceleration of the mainshock. The seismic performance comparison of both structural systems is computed for the maximum, residual inter-story drift and hysteretic energy demands. The results show that post-tensioned frames significantly reduce the structural demands, especially in the case of residual inter-story drifts and hysteretic energy in comparison with moment-resisting steel frames with welded connections. The reductions in the structural response tend to be larger as the intensity of the aftershock tends to increase. Therefore, it is concluded that the use of post-tensioned connections is a great alternative to mitigate the seismic response of buildings subjected to seismic sequences.

Funder

Consejo Nacional de Ciencia y Tecnología

Autonomous University of Sinaloa

National Autonomous University of Mexico

Publisher

MDPI AG

Subject

Building and Construction,Civil and Structural Engineering,Architecture

Reference52 articles.

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2. Posttensioned seismic-resistant connections for steel frames;Ricles;Posttensioned Seism. Resist. Connect. Steel Fram.,2001

3. Garlock, M. (2002). Design, analysis and experimental behavior of seimic resistant post-tensioned steel moment resisting frames. [Ph. D. Thesis, Lehigh University].

4. Seismic Performance of Post-tensioned Steel Moment Resisting Frames with Friction Devices;Rojas;ASCE J. Struct. Eng.,2005

5. Seismic response of self-centering hysteretic SDOF systems;Christopoulos;Earthq. Eng. Struct. Dyn.,2002

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