Masonry elements with chases: Behaviour under compression

Accommodating electrical wiring and similar installations in masonry construction often necessitates the cutting of chases in masonry. In order to investigate the influence of chases on masonry behaviour compression load tests were performed on three series of unreinforced masonry elements with chases. Three different types of chase (horizontal, vertical and inclined) were cut into the masonry elements. After placing the ducts several different types of infill were applied to fill the chases. The compressive load was applied in a deformation-controlled manner up to the failure of the specimen. A considerable reduction in the masonry compressive strength was observed. The test results are discussed in detail and recommendations for practical application are given. In addition, a simple analytical truss model for predictions of failure load is proposed and discussed.

Research highlights
► Testing of masonry elements with chases subjected to compressive loading.
► Chases can reduce the masonry compressive strength considerably.
► Influences of chase orientation, depth and infill type are discussed.
► The high-strength mending mortar could be recommended as suitable chase infill.
► Analytical truss model is introduced together with recommendations for practical application.