混凝土夹心秸秆块砌块砌体偏心受压承载力试验研究

摘要

In this paper,the failure process,failure mode,the out-of-plane deflection and vertical displacement of hollow concrete block filling with compressed straw bricks are analyzed.The results show that filling compressed straw bricks into hollow concrete block can improve the contact effect of block and mortar and strengthen the integrity of the specimen.The ultimate bearing capacity increases 2.3％,5.9％ and 2.5％ respectively under the eccentricity of 0mm,36mm and 72mm,compared with hollow block masonry.The vertical displacement of masonry compression side is larger than the tension side in the whole process.The out-of-plane deflection value in the compression side increases with the eccentricity.Based on experiment research and theoretical analysis,a formula for calculating the bearing capacity of hollow concrete block filling with compressed straw bricks under uniaxial eccentric compression is presented with the correction factor,the calculated value is less than the test value,the calculation method is conservative in design,and the filling compressed straw bricks into hollow concrete block can improve the security of the specimens.%通过试验研究了偏心受压混凝土夹心秸秆块砌块砌体的开裂荷载、破坏过程、破坏形态和极限荷载.试验结果表明:内置秸秆块可以提高块材与砂浆的接触作用,增强试件的整体性,与空心砌块砌体相比极限承载力按偏心距由小到大(0mm、36mm、72mm)分别提高2.3％、5.9％、2.5％;偏心受压试件在受荷全过程所对应的竖向变形受压侧均大于受拉侧;受压侧平面外挠度值随偏心距的增加而增加.在试验研究基础上,通过理论分析与比较,明晰了混凝土夹心秸秆块砌块砌体轴心抗压强度的计算方法;在计算混凝土夹心秸秆块砌块砌体偏心受压承载力时,规范计算方法偏于保守,内置秸秆块可进一步提高安全储备.