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Post-tensioned masonry walls use high-strength steel rods or flexible tendons to enhance the strength and efficiency of masonry structures. These elements are securely anchored to the foundation and extend vertically either within the cores of the masonry units or between the masonry wythes. The construction process involves building the wall with these tensioning elements in place and allowing the mortar to fully cure.
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Study on Retrofitted Masonry Elements under Shear Using Digital Image Correlation.

Benjamín Torres1, Francisco B Varona1, F Javier Baeza1

  • 1Department of Civil Engineering, University of Alicante, 03080 Alicante, Spain.

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|April 15, 2020
PubMed
Summary

Fabric-Reinforced Cementitious Matrix (FRCM) enhances masonry shear behavior. Digital Image Correlation (DIC) accurately monitors FRCM-reinforced masonry, detecting cracks early and improving structural evaluation.

Keywords:
digital image correlation (DIC)fiber-reinforced cementitious matrix (FRCM)masonryshear behaviortextile-reinforced mortar (TRM)

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Engineering

Background:

  • Masonry structures in architectural heritage face challenges with lateral loads like earthquakes.
  • Fabric-Reinforced Cementitious Matrix (FRCM) offers improved shear behavior and substrate compatibility for masonry.
  • Characterizing the mechanical behavior of FRCM-reinforced masonry is crucial for structural assessment.

Purpose of the Study:

  • To evaluate the shear behavior of masonry strengthened with FRCM using Digital Image Correlation (DIC).
  • To characterize the mechanical properties of FRCM materials under tensile stress.
  • To validate DIC measurements against traditional methods like LVDT.

Main Methods:

  • Diagonal tension tests were performed on small masonry specimens (71x71 cm) reinforced with FRCM layers.
  • A Digital Image Correlation (DIC) system monitored displacements and crack patterns during shear loading.
  • Uniaxial tensile tests on FRCM coupons were also monitored using DIC.

Main Results:

  • DIC successfully controlled displacements and captured cracking patterns in FRCM-reinforced masonry specimens.
  • DIC measurements of displacement were validated against Linear Variable Differential Transformer (LVDT) data.
  • DIC enabled early detection of crack initiation in masonry, surpassing visual inspection capabilities.

Conclusions:

  • DIC is a valuable tool for monitoring the shear behavior and crack propagation in FRCM-strengthened masonry.
  • The study provides essential data for numerical modeling and structural evaluation of reinforced masonry.
  • FRCM shows promise for enhancing the seismic performance of existing masonry structures.