机锯条石砌筑灰缝的抗剪性能试验  

Experimental Investigation of Shear Capacity of Sawn Stone Masonry Joint

作　　者：庄思思[1] 郭子雄[1] 柴振岭[1] ZHUANG Sisi;GUO Zixiong;CHAI Zhenling(College of Civil Engineering,Huaqiao University,Xiamen 361021,China)

机构地区：[1]华侨大学土木工程学院

出　　处：《华侨大学学报（自然科学版）》2019年第4期489-493,共5页Journal of Huaqiao University(Natural Science)

基　　金：福建省科技计划重大项目(015Y4007);福建省自然科学基金资助项目(2015J01212)

摘　　要：以砂浆强度和压应力为主要参数,对12片水泥砂浆砌筑机锯条石石墙进行单调双剪静力加载试验,研究石墙灰缝的破坏过程和抗剪机理.试验结果表明:试件灰缝都呈现显著的剪切脆性破坏,破坏过程可分为为弹性、开裂和摩擦滑移3个阶段;在弹性阶段,切应力-位移曲线近似线性关系,开裂后应力仍增加,直至灰缝形成通缝,应力明显下降并稳定在一定范围,承载力仅由砂浆与石材间的摩擦强度承担;灰缝抗剪强度随着压应力或砂浆强度的增加而增加,压应力的效应更显著;对试验数据进行回归分析,得到水泥砂浆砌机锯条石砌筑灰缝抗剪强度计算公式.Taking the mortar strength and compressive stress as the main parameters,12 sawn stone walls with mortar joint were tested under monotonic static loading,to investigate the failure process and shear mechanism.The results indicate that the failure mode of all walls is brittle,including 3 stages,the elastic,the cracking and the friction-sliding stages;in the elastic stage,the shear stress-displacement curve is nearly linear,in the cracking stage,the shear stress still increases,after the penetrating crack is formed,the shear stress decreases obviously,then stabilizes at a certain range,the load-carrying capacity is only provided by the friction strength between mortar and stone;as the compressive stress and mortar strength increase,the shear strength of mortar joint increases,but the effect of compressive stress is more significant;the formula for the shear strength between mortar strength and compressive stress is presented based on the regression analysis of the test results.

关 键 词：石砌体 机锯条石 抗剪强度 破坏模式 

分 类 号：TU363[建筑科学—结构工程]