Performance-based evaluation of novel solutions for structural resiliency

The repository of this research thrust can be found here.

Seismic performance of steel eccentrically braced frame equipped with butterfly-shaped fuse

Shear fuses are structural elements that protects other critical members by dissipating seismic energy through extreme yielding. This research investigates the application of a novel type of fuses, butterfly-shaped shear fuses, for multi-story braced steel frames. Butterfly-shaped fuse is fabricated by leaving diamond-shaped cutouts in a steel plate and exhibits a more uniform yielding due to links’ tapered geometry. The results suggest that such fuses can reduce drift demands at severe damage states and prevent weak story formation.

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

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.

Seismic performance assessment of tall dual RC frame-wall buildings designed for different level of allowable 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 buildings.
Two-dimensional numerical models of the prototype building are developed in OpenSees framework and incremental dynamic analysis was performed to obtain the seismic demand model. While the results indicate the sensitivity of collapse capacity to drift criteria, lower drift criterion exhibited similar collapse probability as the code-based design for taller frames.