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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。
The tests show that the new type of masonry such as autoclaved fly ash brick, aerated concrete block and concrete perforated brick tend to be slantingly cleaved or baroclinic under the stress of shear and compression. The Code for Seismic Design of Buildings (GB 50011-2010), the seismic shear strength of masonry is only related to the strength of mortar. The seismic shear strength of such masonry can not be correctly calculated. According to the failure of block splitting (baroclinic) under the combined shear and compression forces, the formula for shear strength of masonry shear strength is given according to the principle of maximum principal stress failure. The calculation formula is in good agreement with the test results. The failure strength of block splitting (baroclinic) under shear stress is not only related to the normal stress of masonry and the axial compressive strength ratio of masonry, but also to the axial tensile strength and compressive strength ratio of masonry, In order to determine the axial tensile strength of masonry, it is suggested that diagonal loading masonry splitting test should be conducted according to the American ASTM-E519 standard.