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Updated: Jan 13, 2026

Determination of the Mechanical Properties of Flexible Connectors for Use in Insulated Concrete Wall Panels

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Published on: October 19, 2022

Shear Tests on Polyurethane Flexible Joints.

Łukasz Hojdys¹, Piotr Krajewski¹, Arkadiusz Kwiecień²

¹Faculty of Civil Engineering, Cracow University of Technology, Warszawska 24, 31-155 Krakow, Poland.

Materials (Basel, Switzerland)

|January 10, 2026

Summary

This study examined polyurethane flexible joints under shear stress. Higher precompression increased shear load capacity, with failure occurring at the unit-flexible joint interface.

Keywords:

concrete block flexible joint flexible polyurethane initial shear strength masonry

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Area of Science:

Civil Engineering
Materials Science

Background:

Flexible polyurethanes offer energy dissipation and large deformation capacity, beneficial for seismic applications.
Limited research exists on the shear performance of PM-type polyurethane flexible joints.

Purpose of the Study:

Characterize PM-type polyurethane flexible joints under varying normal stress.
Identify failure modes and estimate mechanical parameters for these joints.
Evaluate joint performance under shear loading conditions.

Main Methods:

Masonry triplet specimens with PM-type polyurethane joints were tested in shear.
Tests were conducted under three precompression levels (0.2, 0.6, 1.0 N/mm²).
Tensile tests were performed for material model calibration, following EN 1052-3.

Main Results:

Ultimate shear loads increased with higher precompression levels.
All specimens exhibited shear failure at the unit-flexible joint interface.
Initial shear strength was 0.729 N/mm², with a friction coefficient of 0.14.

Conclusions:

Precompression significantly enhances the shear load capacity of polyurethane flexible joints.
The unit-flexible joint interface is the critical failure point.
The findings provide essential data for seismic design using these flexible joints.