Harmonising force-based and displacement-based design approaches for the next generation of Eurocode 8: Application to reinforced concrete moment resisting frames
(2022) Engineering Structures — Vol. 272 (2022) (2022)
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- Abstract
- One of the noteworthy developments for the next generation of Eurocode 8 is the inclusion of a complete displacement-based design approach using nonlinear static or dynamic analyses and a set of verifications at the global or local levels, depending on the structural typology. This work investigates the consistency between such approach and classical force-based design applying behaviour factors, for reinforced concrete moment resisting frames. A set of structures designed according to the rules of the three novel ductility classes are used as case studies. Nonlinear static analyses are performed according to a new bilinearisation procedure, and target displacements are computed for the limit states of damage limitation, significant damage, and near collapse. The resulting structural demand, determined globally and in terms of the maximum local deformations among the members, is compared with the recommended values for global and local displacement capacities. Two alternative methods are then used to compute the components of the behaviour factor, which are critically confronted with the currently suggested upper-bound values for design. Finally, a procedure to harmonise displacement-based and force-based approaches is outlined, aiming at deriving values for the design behaviour factor that depend not just on the ductility class but also on additional design parameters which this investigation shows to influence the response.
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Citations
Saraiva Esteves Pacheco De Almeida, J., De Visscher, S., Varum, H., & Correia, A. A. (2022). Harmonising force-based and displacement-based design approaches for the next generation of Eurocode 8: Application to reinforced concrete moment resisting frames. Engineering Structures, 272 (2022). https://doi.org/10.1016/j.engstruct.2022.114632 (Original work published 2022)