Experimental study on shear-compression composite shear performance of fired common brick masonry after high temperature
In order to study the shear-compression composite mechanical properties of brick masonry structure after high temperature,84 masonry specimens were made,and the shear tests under different axial compression ratios after different high temperatures were carried out.The variation law between shear strength and axial compression ratio of masonry after high temperature was obtained,and the ductility of masonry specimens after high temperature under different axial compression ratios was analyzed.The results show that at the same temperature,with the increase of axial compression ratio,the shear strength of masonry increases.When the axial compression ratio is constant,the shear strength of masonry decreases with the increase of temperature.In the range of 0.1～0.5 axial compression ratio,the ductility of masonry increases with the increase of axial compression ratio at the same temperature.When the axial compression ratio is the same,with the increase of temperature,the ductility of masonry decreases gradually.Based on the same compressive stress at room temperature,within 200℃,when the axial compression ratio is 0.3,the shear compression failure occurs.Above 400℃,when the axial compression ratio is 0.2,the shear compression failure occurs.The high temperature leads to the advancement of the masonry shear section.Based on the shear friction theory of variable friction coefficient,the variable friction coefficient of the shear strength formula of ordinary brick masonry was calculated.Combined with the pure shear strength formula of brick masonry after high temperature,the calculation formula of shear-compression composite shear strength of brick masonry after high temperature with temperature as variable was obtained.
high temperaturefired common brickshear-compression composite mechanical performanceaxial compression ratioductility
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