THE CALCULATION ANALYSIS OF DIFFERENT MORTAR MATERIALS ON THE MECHANICAL PROPERTIES OF THE GROUTING STRENGTHENING MASONRY STRUCTUREG

摘要

The reduced mortar strength of the existed masonry structures is the main reason for deterioration of their seismic performance. The use of the grouting strengthening method is by improving the performance of masonry mortar to enhance the integrity and strength of the masonry structures. It opens one of new ways for strengthening the existed masonry structures. The compressive strength and shear mechanical properties of the grouting strengthening masonry structures were calculated and analyzed by using the discrete mechanical model in finite element method and compared with the experimental results. Because of the old and new alternating mortar layers in masonry structures after grouting strengthening, the uniformity of mortar layers is exacerbated, leading to cracks in these regions to carry out more likely. Mortar layer consists of two quite different mechanical material compositions, which induce stress redistribution in mortar layer. The bond strength between new mortar and bricks made the masonry structure have overall higher integrity and improve the shear and compressive bearing capacity. The calculating results show that the shear strength after grouting can be improved by 118%, the compression capacity can be improved by 42%.