Effective stiffness of non-rectangular reinforced concrete walls for seismic design and assessment
(2024) 18th World Conference on Earthquake Engineering (WCEE2024) — Location: Milano, Italy (30.June.2024)
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- Abstract
- The familiar force-based (FB) method of seismic design and analysis of structures is employed worldwide. However, a growing number of codes and standards, including the next-generation Eurocode 8, now include alternative and more accurate displacement-based (DB) approaches. Recent studies have shown that an unsatisfactory determination of the effective stiffness of vertical members is at the heart of significant discrepancies between FB and DB formulations. Therefore, in order to harmonise them, and more generally to enhance the quality of the FB approach, it becomes essential to improve the estimation of the effective stiffness. The latter is estimated, for structural reinforced concrete walls in most design codes, via proposed reduction factors applied to the uncracked wall stiffness. Such reduction factors were based on studies for rectangular cross-section walls, although many walls are in reality non-rectangular. Using the experimental results of a series of walls with different cross-section shapes, the present investigation shows that the reduction factors proposed by design codes are not applicable to non-rectangular cross-section walls, and assesses the ability of nonlinear beam-truss models to determine the effective stiffness according to different procedures to estimate the effective stiffness ratio.
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Citations
Saraiva Esteves Pacheco De Almeida, J., Hoult, R., Payen, B., & Correia, A. (2024). Effective stiffness of non-rectangular reinforced concrete walls for seismic design and assessment. 18th World Conference on Earthquake Engineering (WCEE2024), Milano, Italy. https://hdl.handle.net/2078.5/266346