Abstract
Seismic rehabilitation of pre-code existing buildings requires the choice of the method of strengthening and the determination of the amount of materials to be used optimally. Accurate evaluation of the building response in terms of its capacity at the initial state and that obtained after application of some reinforcement should be performed. For regular buildings, the nonlinear static analysis procedure constitutes a powerful tool that is used to estimate seismic performance. This procedure is characterised by its high effectiveness to account for the non-linear characteristics of the materials involved and provides a direct mean to shape the capacity curve of the construction; enabling then to make the correct decision about rehabilitation task with regards to a desired performance state. In this work, the nonlinear static pushover analysis was performed by means of ZeusNL software. Use was made of the Moroccan seismic regulations RPS2000 version 2011to determine the targeted seismic demand. Considering a four floor reinforced concrete building which is undersized with regards to actual seismic regulation, jacketing with fiber reinforced composites at different reinforcement rates was analyzed. The obtained results were expressed in terms of the lateral resistance capacity and the building tip displacement. Optimal jacketing of columns was then determined.
Highlights
Seismic rehabilitation of existing reinforced concrete (RC) buildings can be performed by using various techniques [1]
Sheets made from Fiber Reinforced Plastic composites (FRP) can be used as external wrapping bonded on concrete members [2,3,4]
Empirical models that have been developed to predict the strength of uniformly FRP confined concrete relate failure, for a given plain concrete strength, to the concrete strength increase due to the lateral pressure provided by the FRP
Summary
Seismic rehabilitation of existing reinforced concrete (RC) buildings can be performed by using various techniques [1]. By analyzing 20 existing models to integrate the performance of strength resulting from carbon wraps, Rousakis et al [13] noticed many divergences The majority of these models focused on the monotonic axial behavior of FRP-confined concrete [14] Recently, a unified stress-strain model that enables to represent the axial behavior of circular and square/rectangular RC columns confined internally with transverse steel reinforcements (TSR) and externally with FRP or both TSR and FRP was proposed [15]. This modelling is used in this work where focus is on sizing of jacketing with the aim of realizing seismic rehabilitation of pre-code buildings through the nonlinear static pushover analysis (NSPA) approach.
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