The assessment of the effectiveness of strengthening interventions against the out-of-plane failure mechanisms of masonry walls requires developing a proper modelling approach. In this paper, the attention is focused on strengthening systems based on injected anchors made of carbon fibre reinforced polymer (CFRP) tubes. The resistance to corrosion and the possibility of using traditional grouts make such systems a promising alternative to steel bars in interventions on masonry structures aimed at improving poor connections between orthogonal walls. The paper introduces a modelling approach to assess the anchors contribution in the out-of-plane response of T-shaped masonry walls under horizontal actions. The approach adopts a rigid macro-block model of masonry based on the kinematic method of limit analysis. The contribution of the anchors is evaluated at the onset of the out-of-plane response of the strengthened system, defining its horizontal capacity and the crack inclination of the expected mechanism. The results obtained with the proposed model are firstly validated through the comparison with literature experimental findings. Then, parametric analyses are developed accounting for geometric and loading parameters characterizing T-shaped wall connections, and the performance of different layouts of anchors is assessed. Preliminary design indications are also provided to address the optimal balance between effectiveness, low invasiveness, and costs of such strengthening interventions.

Out-of-plane response of T-shaped masonry walls strengthened with CFRP injected anchors: Modelling and design provisions

Ceroni F.;
2021-01-01

Abstract

The assessment of the effectiveness of strengthening interventions against the out-of-plane failure mechanisms of masonry walls requires developing a proper modelling approach. In this paper, the attention is focused on strengthening systems based on injected anchors made of carbon fibre reinforced polymer (CFRP) tubes. The resistance to corrosion and the possibility of using traditional grouts make such systems a promising alternative to steel bars in interventions on masonry structures aimed at improving poor connections between orthogonal walls. The paper introduces a modelling approach to assess the anchors contribution in the out-of-plane response of T-shaped masonry walls under horizontal actions. The approach adopts a rigid macro-block model of masonry based on the kinematic method of limit analysis. The contribution of the anchors is evaluated at the onset of the out-of-plane response of the strengthened system, defining its horizontal capacity and the crack inclination of the expected mechanism. The results obtained with the proposed model are firstly validated through the comparison with literature experimental findings. Then, parametric analyses are developed accounting for geometric and loading parameters characterizing T-shaped wall connections, and the performance of different layouts of anchors is assessed. Preliminary design indications are also provided to address the optimal balance between effectiveness, low invasiveness, and costs of such strengthening interventions.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11367/100594
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