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Earthquakes and Structures Volume 11, Number 2, August 2016 , pages 217-243 DOI: https://doi.org/10.12989/eas.2016.11.2.217 |
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Seismic response of complex 3D steel buildings with welded and post-tensioned connections |
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Alfredo Reyes-Salazar, Sonia E. Ruiz, Eden Bojorquez, Juan Bojorquez and Mario D. Llanes-Tizoc
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| Abstract | ||
| The linear and nonlinear seismic responses of steel buildings with perimeter moment resisting frames and welded connections (WC) are estimated and compared with those of buildings with posttensioned connections (PC). Two-dimensional (2D) and three-dimensional (3D) structural representations of the buildings as well as global and local response parameters are considered. The seismic responses and structural damage of steel buildings with PC may be significantly smaller than those of the buildings with typical WC. The reasons for this are that the PC buildings dissipate more hysteretic energy and attract smaller inertia forces. The response reduction is larger for global than for local response parameters. The reduction may significantly vary from one structural representation to another. One of the main reasons for this is that the energy dissipation characteristics are quite different for the 2D and 3D models. In addition, in the case of the 3D models, the contribution of each horizontal component to the axial load on an specific column may be in phase each other during some intervals of time, but for some others they may be out of phase. It is not possible to observe this effect on the 2D structural formulation. The implication of this is that 3D structural representation should be used while estimating the effect of the PC on the structural response. Thus, steel frames with post-tensioned bolted connections are a viable option in high seismicity areas due to the fact that brittle failure is prevented and also because of their reduced response and self-centering capacity. | ||
| Key Words | ||
| steel buildings; welded and post-tensioned connections; nonlinear analysis; seismic loading; 2D and 3D structural representation | ||
| Address | ||
| Alfredo Reyes-Salazar, Eden Bojorquez, Juan Bojorquez and Mario D. Llanes-Tizoc: Facultad de Ingenieria, Universidad Autonoma de Sinaloa, Ciudad Universitaria, Culiacan Sinaloa, Mexico Sonia E. Ruiz: Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico, Ciudad Universitaria, Mexico D.F., Mexico | ||