Modelling Strain Penetration Effects in Rc Walls with Smooth Steel Bars

• Main Author: Caruso, Claudia
• Publication Date: 2017
• Other Authors: Bento, Rita, Correia, António A., Sousa, Romain
• Language: eng
• Source: Repositórios Científicos de Acesso Aberto de Portugal (RCAAP)
• Download full: http://hdl.handle.net/10400.8/4692
• topic: Numerical modelling; Smooth reinforcing bars; Concrete–steel bond

Reinforced concrete (RC) framed and dual wall-frame structures represent an important fraction of the building stock in some European cities. Many of these were constructed without seismic provisions. Therefore, it is important to assess their ability to withstand seismic events and to define strategies to reduce their potential vulnerability. This work focuses on the numerical simulation of the seismic behaviour of RC walls making use of fibre-based nonlinear beam-column elements. Even though it is common to assume a perfect bond between the reinforcing bars and concrete, the relative bond-slip deformations between the two materials can contribute up to 40% of the total lateral deformation of columns when ribbed rebars are used and up to 90% when in the presence of smooth rebars. This paper intends to be a contribution to understand the importance of these effects in old RC walls, namely through the consideration of both ribbed and smooth rebars with different anchorage lengths and provide indications regarding the use of a simplified bond-slip model.