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Curved members, such as arches, vaults and domes are well-recognized both architectural beauty and primary structural portions in a masonry building, especially when dealing with historical heritage. Nonetheless, they are mostly related to existing constructions and often least to new ones. One of the main reasons depends on the building methodology which is time-consuming and cost expensive. In fact, scaffoldings should be built before the erection of curved members, which need later to be removed at the end of the procedure. In this area of interest, the present paper aims to demonstrate the validity of an alternative construction technique, which led to a recent patent obtained by the authors. It consists in the extrados strengthening by means of a particular application of Fiber-Reinforced Polymer (FRP) when the arch-needed blocks are all aligned on the ground and properly designed for erection by simple lifting. The lifting operations of the so-made linked body provides the final shape of the arch according to the designed span and load bearing capacity, as same as it is done for traditional arches. At this scope, a full-scale stone made arch—250 mm and 6500 mm for thickness and span, respectively—Was prototyped in laboratory to make evidence of both the reliability of the proposal and the structural improved performance with respect to the vertical loading across the middle-line. In such a way, the manpower is reduced considerably, as well as the time needed for the building itself. At the same time, the tensile strain that may occur on the extrados for the arch are absorbed by the FRP. The paper provides the detailed description of the technology, which has been previously experienced in low-scale dimensions, and herein for the first time in full scale. The experimental results related to strain monitoring under the applied load are shown and discussed. The result highlighted the new opportunity to build curved members, not only made by masonry blocks, even if under extreme conditions of high weight and large span.

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A Full-Scale Prototype of A FRP-Strengthened Stone Arch Built Without Scaffold due to a Patented Method

  • 会议论文

  • 发表日期：

    2025年

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  • Alessio Cascardi,
  • Roberto Lamuraglia,
  • Francesco Micelli,
  • Maria Antonietta Aiello

摘要

Curved members, such as arches, vaults and domes are well-recognized both architectural beauty and primary structural portions in a masonry building, especially when dealing with historical heritage. Nonetheless, they are mostly related to existing constructions and often least to new ones. One of the main reasons depends on the building methodology which is time-consuming and cost expensive. In fact, scaffoldings should be built before the erection of curved members, which need later to be removed at the end of the procedure. In this area of interest, the present paper aims to demonstrate the validity of an alternative construction technique, which led to a recent patent obtained by the authors. It consists in the extrados strengthening by means of a particular application of Fiber-Reinforced Polymer (FRP) when the arch-needed blocks are all aligned on the ground and properly designed for erection by simple lifting. The lifting operations of the so-made linked body provides the final shape of the arch according to the designed span and load bearing capacity, as same as it is done for traditional arches. At this scope, a full-scale stone made arch—250 mm and 6500 mm for thickness and span, respectively—Was prototyped in laboratory to make evidence of both the reliability of the proposal and the structural improved performance with respect to the vertical loading across the middle-line. In such a way, the manpower is reduced considerably, as well as the time needed for the building itself. At the same time, the tensile strain that may occur on the extrados for the arch are absorbed by the FRP. The paper provides the detailed description of the technology, which has been previously experienced in low-scale dimensions, and herein for the first time in full scale. The experimental results related to strain monitoring under the applied load are shown and discussed. The result highlighted the new opportunity to build curved members, not only made by masonry blocks, even if under extreme conditions of high weight and large span.