Displacement Profile for Displacement Based Seismic Design of Concentric Braced Frames

Abstract eng:
The direct displacement based design (DDBD) procedure is well developed and used for designing reinforced concrete and steel moment resisting frame structures, wall structures and bridges. However, limited number of studies is available on designing steel concentric braced frame (CBF) structures using DDBD approach and also those studies used the displacement profile developed for the reinforced concrete moment resisting frame structures by Priestley et al. (2007) as the design displacement profile for CBFs. Therefore, an appropriate design displacement profile for CBFs is required to enhance the seismic design and performance of CBFs. On this regards, an attempt is made to develop a design displacement profile based on the median maximum storey displacements obtained from the nonlinear time history analyses for a set of real ground accelerations. For this purpose, pre-determined four different steel CBF structures with varying brace configuration and storey height are selected. The nonlinear time history analyses are performed for the 3-D nonlinear finite element models of the selected frames using OpenSEES software. The developed models are capable of simulating the outof-plane buckling and low cycle fatigue failure of braces. The models are subjected to a set of 30 real ground motion records with varying levels of spectral acceleration at the first model period of the structures. The maximum storey displacement at each storey levels is recorded for all the ground motion records. On the basis of the observed storey displacement and interstroey drift, the appropriate design displacement profile for CBFs is proposed.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket