Concrete and Earthquake Engineering Research Group

Department of Civil & Structural Engineering

Dr Neda Nabid

PhD Student

Contact

nnabid1@sheffield.ac.uk

Department of Civil and Structural Engineering
Sir Frederick Mappin Building
Mappin Street,
Sheffield,
S1 3JD

Profile

Neda obtained her Bachelor of Science (BSc) in Civil Engineering from the University of Science and Culture in 2008 in Tehran, Iran. She completed her Master of Science (MSc) in Structural Engineering with distinction at the same University in 2011. After working in industry for three years, she moved to the University of Sheffield in 2014 to pursue a PhD in earthquake engineering and finished it successfully in 2019. Neda's expertise is on seismic strengthening of multi-storey RC frames using innovative passive and semi-active control systems to improve their seismic performance under earthquake excitations. Her research interests also include earthquake engineering, passive and semi-active control systems, and optimisation. 

Recent activities and achievements

Project title: Performance-based optimisation of multi-storey RC frames using passive and semi-active control of friction-based dampers 

Objectives: The main aim of this project is to develop a novel optimisation framework for performance-based design of passive and semi-active friction wall dampers to improve the seismic performance of substandard RC buildings in seismic regions. This will be achieved by fulfilling following objectives:  

  • Developing a simple performance-based design methodology to obtain the best slip load distribution patterns for seismic design and strengthening of RC frames using friction-based passive control dampers.
  • Examining the effects of different earthquake ground motions (with a wide range of frequency contents), and damper properties on dynamic behaviour of frames with passive and semi-active friction-based dampers.
  • Studying different semi active control algorithms to find the most efficient feedback control algorithm to adjust the characteristics of the supplemental dampers based on the structural response.
  • Developing more efficient semi-active control algorithms, compensating the limitations of passive and existing semi-active controllers, and assessing their performance. 

Tasks and methodology: To achieve the specified objectives, following methodology is adopted: 

  • Performing non-linear dynamic analyses on low-to-high rise RC frames with and without friction-based passive control system. 
  • Investing the effects of different slip load distribution patterns on seismic performance of the controlled frames under different earthquake records. 
  • Studying parameters affecting the friction damper and the frame behaviour. 
  • Developing suitable semi-active control strategies regarding the relationship between variation of damper characteristics and structural response. 
  • Investigating the efficiency of the developed control algorithms.

Expected results: 

  • A practical performance-based design methodology for optimum seismic design of passive friction-based dampers.
  • Developing a new semi-active control algorithm to adjust the characteristics of the proposed friction damper based on the structural response

Supervisor: Dr Iman Hajirasouliha