多层砌体结构墙体的抗震剪切强度研究  

Study on seismic shear strength of wall for multi-story masonry structures

作　　者：刘西光[1] 王庆霖[2] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]西安建筑科技大学,西安710055

出　　处：《建筑结构》2012年第12期112-116,共5页Building Structure

摘　　要：试验表明蒸压粉煤灰砖、加气混凝土砌块、混凝土多孔砖等新型砌体在剪压复合受力下往往发生块体斜向劈裂或斜压破坏,《建筑抗震设计规范》(GB 50011—2010)中砌体的抗震剪切强度仅与砂浆强度有关,已不能正确计算这类砌体的抗震剪切强度。针对剪压复合受力下块体劈裂(斜压)破坏,依据最大主应力破坏准则给出了砌体剪压抗剪强度计算公式。计算公式与试验结果吻合良好。剪压复合受力下块体劈裂(斜压)破坏强度不仅与砌体的正应力和砌体轴心抗压强度比有关,也与砌体的轴心抗拉、抗压强度比有关,为确定砌体的轴心抗拉强度,建议参照美国ASTM-E519标准进行对角加载砌体劈裂试验。Tests show that in the masonry walls of autoclaved flyash-lime brick,sutolaved aerated concrete block and concrete perforated brick under the shear-compression action,the diagonal splitting and crushing failure mode of units usually occurreds.Seismic shear strength in the Code for seismic design of buildings（GB 50011—2010） depends only on the mortar strength,therefore the shear capacity of the above-mentioned masonry walls can not be estimated correctly.Aiming at the diagonal splitting and crushing failure mode of units under the shear-compression action,according to maximum principal stress failure criterion,the relevant formula for determination shear strength was established.The formula shows a good agreement with the experimental results.The ultimate shear strength of diagonal splitting and crushing failure of units not only depends on normal stress to compression strength ratio of masonry,but also depends on the axial tension strength to compression strength ratio.In order to define the axial tension strength of masonry,the diagonal tension（shear） test according to the code ASTM-E519 is suggested.

关 键 词：砌体 抗剪强度 剪压复合作用 破坏准则 抗拉强度 

分 类 号：TU398.7[建筑科学—结构工程]