ENERGY FACTOR BASED SEISMIC DESIGN AND EVALUATION METHOD FOR TENSION-ONLY BRACED BEAM-THROUGH STEEL FRAMES

In order to realize the damage-control behavior of tension-only concentrically braced beam-through steel structural systems, the energy factor seismic demand index probability model of the structural system in the damage control stage is firstly established, and then the seismic design and evaluation method is proposed based on the energy factor incorporating the probability model of the seismic demand. A typical three-story tension-only concentrically braced beam-through steel structural system is selected to demonstrate the proposed design and evaluation process. The analysis results show that the structure designed through the seismic design and evaluation process proposed in this paper can achieve damage-control performance, that is, the damage is concentrated in the tension-only braces which can be easily replaced and the main frame remains elastic, thus no obvious residual deformation after earthquakes. Furthermore, the rationality of the method is verified by time history analysis.