Experimental study on shear performance of fired common brick masonry after high temperature
After a fire in an existing brick masonry buildings,both the strength of mortar and the bond performance between bricks and mortar exhibit noticeable decreases,subsequently affecting the shear resistance and seismic performance of the masonry.In order to understand the degradation pattern of shear resistance in fired common brick masonry after high temperatures,36 fired common brick masonry specimens were fabricated and subjected to shear tests at room temperature,200,400℃ and 500℃ respectively.The temperature face-fields of the specimens under different temperature were measured,and the shear load-displacement curves of the masonry specimens after room temperature,200,400℃ and 500℃ were plotted.The results indicate that compared with the shear strength of fired common brick masonry at room temperature,the shear strength of specimens decreases as the temperature increases.When shear failure occurs in the fired common brick masonry,deformation is within 2mm,indicating typical brittle failure.Under the same temperature conditions,as the strength of cement mortar in fired common brick masonry increases,the shear strength and peak displacement of the specimens also increase.Using cement mortar with same strength,as the temperature increases,the shear strength of the specimens decreases while the peak displacement slightly increases.Residual shear strength of fired common brick masonry after high temperatures was fitted,and a calculation method for shear strength of fired common brick masonry after high temperatures was proposed,the calculated shear strength values are in good agreement with experimental values.
high temperaturefired common brickshear strengthcoefficient of variation
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