Location
Cork Institute of Technology, Cork, Ireland
Event Website
https://event.ceri2020.exordo.com/
Start Date
27-8-2020 11:45 AM
End Date
27-8-2020 1:00 PM
Description
Some types of structures can suffer from vertical irregularities due to aesthetic, functional, or economic reasons. A possible lateral force resisting solution for this type of structures is to use Concentrically Braced Frame (CBF) systems. CBFs are gaining a lot of popularity as their design and fabrication are straight forward with low cost. Moreover, they are overcoming many limitations exist in other lateral force resisting systems. In this paper, a direct displacement-based design (DDBD) procedure is developed for irregular multi-storey CBF structures. In this procedure, design displacements considered are decided upon the code and material drift limits, then the strength required to achieve this displacement is calculated and finally all structural elements are designed. A case study of twelve-storey CBFs with vertical irregularity is designed using the developed DDBD procedure. The configuration of the vertical irregularity assessed is in the form of setbacks up the vertical axis of the building where the frames have more bays at base of the building than at the top. Non-linear time history analysis (NLTHA) using 7 different earthquakes with displacement response spectra matching the design displacement spectrum are used to validate the behaviour of the irregular CBF structure. The case study of twelve-story CBFs with vertical irregularity is used to check the performance of the new design methodology. It is found that the design displacements, storey drifts from the DDBD procedure for the case study with vertical irregularity matched relatively well with the displacements and storey drifts recorded through the NLTHA analyses and a new DDBD procedure for CBFs with vertical irregularity is validated.
Recommended Citation
Salawdeh, Suhaib, "Direct Displacement Based Seismic Design of Irregular CBFs" (2020). Civil Engineering Research in Ireland 2020. 2.
https://sword.cit.ie/ceri/2020/7/2
Included in
Civil Engineering Commons, Construction Engineering and Management Commons, Environmental Engineering Commons, Geotechnical Engineering Commons, Hydraulic Engineering Commons, Structural Engineering Commons, Transportation Engineering Commons
Direct Displacement Based Seismic Design of Irregular CBFs
Cork Institute of Technology, Cork, Ireland
Some types of structures can suffer from vertical irregularities due to aesthetic, functional, or economic reasons. A possible lateral force resisting solution for this type of structures is to use Concentrically Braced Frame (CBF) systems. CBFs are gaining a lot of popularity as their design and fabrication are straight forward with low cost. Moreover, they are overcoming many limitations exist in other lateral force resisting systems. In this paper, a direct displacement-based design (DDBD) procedure is developed for irregular multi-storey CBF structures. In this procedure, design displacements considered are decided upon the code and material drift limits, then the strength required to achieve this displacement is calculated and finally all structural elements are designed. A case study of twelve-storey CBFs with vertical irregularity is designed using the developed DDBD procedure. The configuration of the vertical irregularity assessed is in the form of setbacks up the vertical axis of the building where the frames have more bays at base of the building than at the top. Non-linear time history analysis (NLTHA) using 7 different earthquakes with displacement response spectra matching the design displacement spectrum are used to validate the behaviour of the irregular CBF structure. The case study of twelve-story CBFs with vertical irregularity is used to check the performance of the new design methodology. It is found that the design displacements, storey drifts from the DDBD procedure for the case study with vertical irregularity matched relatively well with the displacements and storey drifts recorded through the NLTHA analyses and a new DDBD procedure for CBFs with vertical irregularity is validated.
https://sword.cit.ie/ceri/2020/7/2
