Numerical analysis of RC wall with opening and strengthened with CFRP

Abstract

The present work simulates and analyzes numerically two one-way walls (OW) with a central unforeseen cut-out-opening, which were previously tested experimentally. The models are based in the Finite Element Method and consider nonlinear behavior of the concrete material, such as hardening/softening and fracture. The first wall model was analyzed without any type of strengthening whereas the second one was strengthened using externally bonded CFRP along the opening edges. The strengthening modeling process was discussed through three different approaches suitable for unidirectional CFRP wrap. Load results were presented with load-displacement and load-strain curves that evidenced the flexural behavior of these structures. The crack pattern and failure mode observed showed good agreement with reported literature. The CFRP strengthening presented a small influence in the load capacity for big opening size.

Aspects of finite element modeling of strengthened RC walls with opening

“…There are several approaches to simulate CFRP fabric in finite element analysis. Some of them are discussed in detail by Silva et al (2021). In the present study, 2D membrane elements working in a plane-stress state were used.…”