Seismic energy demands on steel framed structures with rigid and, alternatively, with post-tensioned semi-rigid connections

摘要

The distribution of the dissipated hysteretic energy along the height of regular steel frames with rigid, and, alternatively, with semi-rigid post-tensioned connections, is evaluated. For this aim, non-linear time history analyses are performed for both types of structural systems in order to obtain distribution factors of the normalized dissipating energy along the frames height. Thirty long duration ground motion records obtained in the soft soil of Mexico City are used. Simplified mathematical expressions are proposed for the distribution factors. The expressions, which are lognormal type, are function of the inter-story drift and of the frames height. It is observed that, for the frames analyzed, the amount of hysteretic energy is larger in the elements located around 0.4 of the frames height.