剪压复合作用下块体-砂浆界面力学性能试验研究

Experimental Study on Mechanical Properties of Block-Mortar Interface under Shear-compression Loading

该文通过烧结粘土实心砖设计了24组72个三砖砌体标准试件进行双剪粘结滑移试验,进行了不同轴压比、砂浆等级对砖-砂浆界面剪切应力及剪切应变的影响试验,分别得到了砖砌体标准件界面的粘结破坏形态、粘结强度及粘结强度-滑移曲线,给出了砌体粘结强度计算式及块体与砂浆界面抗剪粘结滑移本构模型。基于ABAQUS有限元分析软件建立砖砌体精细化有限元分析模型,分析不同轴压比和砂浆等级对砌块、砂浆界面受剪性能的影响,通过对比分析有限元分析结果与试验实测结果,论证了材料本构模型的适用性及精细化数值分析模型的有效性及合理性。通过不同轴压比和砂浆等级对块体、砂浆界面剪压粘结-滑移试验性能展开数值分析,模拟结果表明,有限元粘结滑移模拟曲线与试验曲线比较吻合。

Seventy-two three-brick masonry specimens in 24 groups were designed for double shear bond-slip tests using sintered clay solid bricks,to study the effects of different axial compression ratios and mortar grades on shear stress and shear strain at the brick-mortar interface,yielding the bond failure form,bond strength and bond strength-slip curve of the interface of standard brick masonry,and obtaining the calculation equation of masonry bond strength and the shear bond-slip constitutive model of the interface between block and mortar.Based on ABAQUS finite element analysis software,a refined finite element analysis model of brick masonry was established to analyze the influence of different axial compression ratios and mortar grades on the shear performance of the block and mortar interface.Through analytic comparison between the finite element analysis results and the experimental results,the applicability of the material constitutive model and the validity and rationality of the refined numerical analysis model were demonstrated.Numerical analysis was conducted on the shear-compression bond-slip test performance of the block and mortar interface,with different axial compression ratios and mortar grades.The simulation results showed that the finite element bond-slip simulation curve is in good agreement with the experimental curve.