高温后烧结普通砖砌体剪压复合抗剪性能试验研究  

Experimental study on shear⁃compression composite shear performance of fired common brick masonry after high temperature

作　　者：周浩南 高立堂[1] 李晓东[1] 赵长勇[1] 崔文松 ZHOU Haonan;GAO Litang;LI Xiaodong;ZHAO Changyong;CUI Wensong(School of Civil Engineering,Qingdao University of Technology,Qingdao 266520,China)

机构地区：[1]青岛理工大学土木工程学院,青岛266520

出　　处：《建筑结构》2024年第14期133-139,共7页Building Structure

摘　　要：为了研究砖砌体结构在高温后的剪压复合受力性能,制作了84个砌体试件,进行了在不同高温后不同轴压比下的抗剪试验,得出砌体在高温后的抗剪强度和轴压比之间的变化规律,对高温后砌体试件在不同轴压比情况下的延性进行了分析。结果表明:在相同温度下,随着轴压比增大,砌体抗剪强度增大;轴压比一定时,随着温度升高,砌体抗剪强度减小。在0.1~0.5轴压比范围内,同一温度下,随着轴压比增加,砌体的延性不断增大;轴压比相同时,随着温度的升高,砌体延性逐渐降低。以常温下相同压应力为基准,200℃以内,轴压比为0.3时试件出现剪压破坏;400℃以上,轴压比为0.2时试件出现剪压破坏,高温使砌体剪压段提前。基于变摩擦系数的剪摩理论,计算出普通砖砌体抗剪强度公式的变摩擦系数;结合高温后砖砌体纯剪强度公式,得到以温度为变量的高温后砖砌体剪压复合抗剪强度计算公式。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 01~05 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 03,the shear compression failure occurs.Above 400℃,when the axial compression ratio is 02,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.

关 键 词：高温 烧结普通砖 剪压复合受力性能 轴压比 延性 

分 类 号：TU362[建筑科学—结构工程]