【摘要】 通过试验,系统研究了混凝土多孔砖的抗剪性能,提出了混凝土多孔砖砌体材料抗剪强度的计算方法,给出了灰缝的剪应力-剪应变本构关系计算模型,为制定《混凝土砖建筑技术规范》(CECS257:2009)提供了支持.结果表明:混凝土多孔砖砌体的抗剪强度大于同等级下普通砖砌体;抗剪强度随块型的不同而有少许差别;有初始压应力混凝土多孔砖砌体的抗剪强度较无初始压应力的小;有加载历史砖砌体的抗剪强度较无加载历史的大;压-剪复合作用下混凝土多孔砖砌体抗剪强度在一定范围内符合Mohr-Coulomb准则;灰缝剪应力-剪应变曲线的初始斜率较大,当接近破坏应力时,应变迅速增大,曲线接近水平.更多还原

【Abstract】 Based on shear tests,the shear behavior of perforated concrete brick masonry materials was systematically studied,a calculation equation for the shear strength of the material was deduced,a constitutive model for the mortar joint in perforated concrete brick masonry under shear was proposed,which provided the basic references for the development of "Technical Specifications for Concrete Perforated Brick Masonry Buildings"(CECS257:2009).The results indicate that the shear strength of perforated concrete brick masonry is higher than that of fired perforated brick masonry with the same brick and mortar strength.For the different type of bricks the shear strength of masonry materials are a little bit different,the shear strength of the masonry with initial compressive stress in construction is lower than that of the masonry without initial compressive stress,the shear strength of the masonry with loading history is higher than that of the masonry without loading history,and the shear strength of masonry under compression can be determined with the Mohr-Coulomb criterion in a certain range.The results also indicate that the initial slop of the shear stress-shear strain curve is big;when the stress approaches the ultimate stress,the strain increases rapidly,but the stress is almost a constant.更多还原