【摘要】 针对配筋砌块砌体的特点,采用数值计算的方法确定配筋砌块砌体剪力墙的屈服曲率和极限曲率,并建立剪力墙曲率延性比和位移延性比的关系。根据计算结果,讨论轴压比、剪跨比、边缘钢筋屈服强度、腹板竖向钢筋的抗力、砌体的抗压强度和极限压应变对剪力墙位移延性的影响,其中限制轴压比、设置约束边缘构件是提高剪力墙延性的有效途径。通过推导出的轴压比限值的近似公式,分析各因素对轴压比限值的影响,并建议采用约束砌块砌体和约束混凝土作为约束边缘构件以提高墙的延性。结合高层建筑工程实际,分析确定不同约束边缘构件的矩形截面和工字形截面剪力墙的轴压比限值,提出约束边缘构件的构造要求和实用的设计建议。更多还原

【Abstract】 Based on the properties of reinforced block masonry,the yielding curvature and the ultimate curvature are calculated by numerical method,and the relationship between curvature ductility ratio and displacement ductility ratio is established for reinforced-block-masonry shear walls.The major influencing factors of shear wall ductility include the axial compression ratio,the shear span ratio,the yielding strength of flange steel bars,the mechanical resistance of web steel bars,the compression strength and the ultimate compression strain of masonry.Limiting the axial-compression-ratio and placing flange restraint are effective means to improve the ductility.A formula of axial-compression-ratio limit is deduced to analyze approximately the influences of these factors.Restrained masonry and restrained concrete members are proposed to increase the ductility of shear walls.In reference to the practice for high-rise buildings,the axial-compression-ratio limit is specified for rectangular sections with different confined boundary members and I-shaped sections,and the construction details for members with confined boundary,and practical method for seismic design are also suggested.更多还原