螺栓连接装配式墙板抗侧刚度研究

Lateral Stiffness of Bolted Prefabricated Concrete Wall

螺栓连接装配式墙板体系具有连接简单、建造快速的优势,近年来工程应用逐渐增多。本文以钢板拼接式螺栓连接和穿缝式螺杆连接两种常见的螺栓连接装配式墙板为研究对象,进行7片墙板的拟静力试验。结果显示:螺栓连接装配式墙板由于水平缝处张开,墙体发生刚性转动,导致抗侧刚度低于现浇墙板。通过弹性理论分析和有限元数值模拟,揭示了螺栓连接装配式墙板的水平变形特性,分析了影响墙体抗侧刚度下降的因素,提出了相应的抗侧刚度计算公式。通过对比数值分析结果与试验结果,验证了本文公式的可靠性。基于参数分析的研究结果,回归了考虑螺栓节点配钢率、墙体的高宽比、轴压比和节点相对位置4个参数的干式螺栓连接装配式墙板抗侧刚度降低系数的简化计算公式,该简化公式的计算结果与数值模拟的结果误差在±20%之内,表明预测结果较为准确。提出的抗侧刚度计算公式可为建立低多层螺栓连接装配式墙板结构体系的设计理论提供参考。

The bolted prefabricated concrete wall is widely used in construction due to its simple connection and rapid construction.The quasi-static tests of seven full-scale dry-type bolted prefabricated concrete walls(including four steel-plate-type bolted walls and three through-connection-type bolted walls)were conducted.The test results indicated that the bolted prefabricated wall would spread out at horizontal connection firstly and then the wall had rigid rotation,resulting in a lower lateral stiffness than the cast-in-place wall panel.Based on the elastic theoretical researches and finite numerical analyse,the horizontal deformation feature of the bolted prefabricated concrete wall was revealed,and the effect factors of lateral stiffness were analyzed.Moreover,the calculation formula of initial lateral stiffness of bolted prefabricated concrete wall was derived and its reliability was verified by numerical analyse and test results.In addition,through parameter analyse,a simplified calculation formula for initial lateral stiffness reducing the coefficient of bolted prefabricated concrete wall considering four effect factors(steel ratio of connection,height-width ratio of wall,axial compression ratio,and relative position of connection)was proposed.The error between the results by simplified formula and numerical analysis results is within 20%,indicating that the predicated results by the proposed simplified formula have high precision.