- Risk Management of Post-Earthquake Fire
Researchers: Behrouz Behnam, Hamid Reza Ronagh , Peter Dux, Jose Torero, and Martin Skitmore
Post-earthquake fire is a major threat in seismic areas which can lead to the collapse of buildings that are partially damaged in a prior earthquake. The majority of standards and codes for the design of structures against earthquake or fire ignore the possibility of post-earthquake fire and thus buildings designed according to those codes fail prematurely when subjected to fire after earthquake. A series of investigations are performed in this project in order to evaluate the level of vulnerability of buildings under PEF following by proposal for retrofitting these structures in order to upgrade their strength.
- Earthquake Performance of FRP-Retrofitted RC Structures
Researchers: Abolfazl Eslami, Hamid Reza Ronagh, and Mahmud Ashraf
Through an extensive experimental and numerical job, this study aims to investigate the efficiency of externally bonded FRP composites at beam-to-column connection in improving the seismic behaviours of RC structures subjected to both near-fault and far-fault ground motions. The experimental part consists of 12 external beam-column joint specimens retrofitted using different flange-bonded techniques which will be tested under both monotonic and cyclic loads. The strengthening and rehabilitation schemes aim to not only increasing the load carrying capacity, but also to relocate the plastic hinge away from the column face into the beam. The performance of a whole structure retrofitted using FRP sheets will also be investigated implementing nonlinear static and time history analysis.
- Repair of subsea pipelines with Composite overwrap system
Researchers: Nariman Saeed, Hamid Reza Ronagh, Amandeep Virk, and Mahmud Ashraf
Using composite overwrap system is a new method for pipeline repair and needs to be more investigated. This project aims to propose a reliability based method of design. Performing an extensive experimental job will provide a proper amount of information to find statistical distribution for FRP mechanical properties before and after degradation. Doing some numerical and analytical modelling is another part of this project.
- Seismic Evaluation annd Retrofitting of Beam-Column Joints in Non-Seismically Designed Buildings
Researchers: Pang Jen Lim, Saeed Mahini, and Hamid Reza Ronagh
The aim of this study is to evaluate the seismic performance levels and the response modification factors (R) of several actual non-seismically designed buildings that are located in seismic prone areas, and when they are found inadequate, to design suitable retrofit measures and to test for their effectiveness. This research will allow the collection of data on the seismic evaluation of actual buildings of 8 to 12 storeys tall, the design of suitable retrofitting techniques for them and the formation of a database for future seismic research into similar buildings.
- Evaluation of Damage in Reinforced Concrete Structures Subjected to Near-Fault Earthquakes
Researchers: Vui Van Cao, Hamid Reza Ronagh, and Faris Albermani
After recent earthquakes (Northridge 1994, Kobe 1995, Chi-Chi 1999), the consequences of damage and failure of existing structures in the near-fault region has revealed the vulnerability of existing reinforced concrete buildings against pulse-type ground motions. Utilization of damage indices (DIs) is one way of damage determination for buildings subjected to earthquakes. Advancements in the methods of structural analysis have increasingly made it possible for researchers to come up with more suitable damage indices. Currently available DIs have their own merits but they have some limitations and may not reflect the state of damage appropriately. In this research, a new damage index is proposed based on hysteretic energy. It satisfies all basic requirements for a DI and is expected to rationally predict the appropriate state of damage to a structure. The proposed damage index, together with Park and Ang DI, is used for damage assessment of structures under near-fault ground motions.