Abstract
This paper analyzes the behavior of masonry under variable loads during execution (construction stage). It specifies the creep coefficient for calcium silicate brick masonry, presenting the research data of masonry deformation under variable and constant long-term loads. The interaction of separate layers of composite material in masonry is introduced and the formulae for determining long-term deformations are offered. The research results of masonry’s compressive strength and deformation properties under variable and constant long-term loads are presented. These are then compared to calculated ones. According to the presented comparison, the calculated long-term deformations coincide quite well with those determined experimentally.
Highlights
One of the oldest materials used in construction is masonry
In order to determine the change of mortar and masonry mechanical properties over time, mortar and masonry samples were subjected to short-term static loads at different time
The results show that mortar shrinkage strains are significantly (2–2.5 times) bigger than masonry unit deformations (Figure 6)
Summary
One of the oldest materials used in construction is masonry. Masonry is a material made of masonry units and mortar. Masonry is made up of composite materials. Masonry is used in buildings with other materials, for example, with concrete. In such cases, the overall compatibility of structures is very important, i.e., compatibility of deformations, especially under long-term loads. Masonry structures are gradually loaded from the beginning. Self-weight loads of masonry and the weight of other constructions begins to act on the mortar of bed joints, reaching its designed strength [3,4]. When mortar hardens during the execution, masonry is affected by the variable long-term load. After the design strength is reached, masonry is affected by the constant long-term load (persistent design situation). The research done by us and other authors [1,5,6,7,8,9] show that mechanical characteristics of masonry-mortar bed joints are different to those in benchmark mortar samples
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