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Out-of-plane behaviour of unreinforced masonry strengthened using ferrocement overlay

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Abstract

Given the low tensile strength of unreinforced masonry (URM) walls, they are prone to out-of-plane failure, leading to eventual collapse of masonry buildings. In India and several other countries, seismic strengthening of URM buildings often utilizes ferrocement (welded wire mesh with micro-concrete or cement mortar). This study aims to investigate the efficacy of this technique in enhancing flexural capacity of URM walls in out-of-plane action. Six URM panels and 12 strengthened panels are subjected to flexural strength test, parallel and perpendicular to bed-joints. The effect of strengthening on common parameters, pertaining to out-of-plane flexural behaviour of ferrocement–URM composite walls, including failure modes, flexural strength, and modulus of rupture, is investigated. The experimental results are compared with analytical results obtained using ordinary beam theory. The results show that the URM panels exhibit sudden brittle failure whilst strengthened panels failed in a ductile fashion and exhibited a significant increase in the flexural strength. Further, the ordinary beam theory is able to predict the experimental results with reasonable accuracy.

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Acknowledgments

The authors would like to acknowledge the financial support received from the Temasek Foundation, Singapore, through Nanyang Technological University (NTU), Singapore.

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Authors and Affiliations

  1. Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Sachin B. Kadam & Yogendra Singh

  2. Natural Hazard Research Centre, Nanyang Technological University, Singapore, 639798, Singapore

    Bing Li

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  1. Sachin B. Kadam
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  2. Yogendra Singh
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  3. Bing Li
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Correspondence to Yogendra Singh.

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Kadam, S.B., Singh, Y. & Li, B. Out-of-plane behaviour of unreinforced masonry strengthened using ferrocement overlay. Mater Struct 48, 3187–3203 (2015). https://doi.org/10.1617/s11527-014-0390-8

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  • DOI: https://doi.org/10.1617/s11527-014-0390-8

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