Research

Current Research

An early design decision support system for resilient and sustainable built environment (RSB)

Previous Research

The sensitivity analysis of Tall RC frames seismic performance to design drift limit of ASCE 7 building code

DriftHazard
Seismic demand hazard curves of 20-,25- and 30-story dual tall buildings designed using three drift limit ratios of 1.5% (above code), 2% (code-based) and 3% (lower than code)

  Since 2004, PEER research center started “Tall Building Initiative” to revisit the structural design of high-rise structures using a performance-based approach (more information on TBI project here). While the new approach has gained wide attention, it has also shown the importance of assessing the conventional design, i.e based on current prescriptive codes such as ASCE 7.

  Since design drift limit is the governing factor in the structural design of the code-based tall building, this project evaluated the suitability of design drift limit of ASCE 7 building for high-rise RC frames with shear-wall.  The results of this project established a relationship between drift limit and annualized collapse risk of tall RC structures which can lead to safer and more economical designs.

The project log and published results can be found here : [Project Log]


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

The numerical technique proposed to model AFRP-retrofitted non-ductile RC frames

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.

The published results can be found here : Retrofitting with AFRP paper