The performance-based evaluation of tall wall-frame RC buildings considering the impact of design drift criteria

Drift criteria governs the code-based design of tall buildings. In this study we used probabilistic methods to compare the seismic performance of code-based and beyond- code design of high-rise shear wall-frame RC structures in respect to drift criteria. Three different design alternatives (code-based, beyond-code, lower than code) are investigated for 20-,25- and 30-story building. Two-dimensional numerical models of the prototype building are developed in OpenSees framework and incremental dynamic analysis was performed to obtain seismic demand model. While the results indicate sensitivity of collapse capacity to drift criteira, lower drift criterion exhibited similar collapse probability as the code-based design for taller frames.

Seismic retrofitting of non-ductile RC frames with pre-tensioned AFRP belts

A large stock of non-ductile RC structures poses a great risk to communities. As shown by Liel et al., a non-ductile RC frame structure at a high-seismic site in California is 40 times more likely to collapse than a code-complying ductile one (link). This research investigates how a novel emergency retrofitting technique using pre-tensioned aramid fiber reinforced polymer (AFRP) belts can upgrade the seismic response of such buildings through active and passive confinement. The results indicate that the proposed technique can reduce the collapse probability up to one-fifth of the original probability.