外置钢板对拉连接装配式柱节点力学性能试验研究

Mechanical performance experiment on the joint with double pretension steel plates of prefabricated concrete column

为了考察钢筋套筒灌浆连接装配式混凝土柱连接节点的力学性能,并对节点连接方式给予改进,设计并制作了6根装配式混凝土受压试件,其中3根试件采用钢筋套筒灌浆连接方式,另3根试件采用套筒灌浆+对拉钢板的连接方式。对6根试件施加轴向压力,获得各试件极限承载力、轴向变形和材料应力变化等试验数据。基于试验数据,开展了这类压弯作用下力学性能研究。结果表明:采用对拉钢板连接节点的受压试件在受力过程中,其控制截面基本符合平截面假定;在偏心受压条件下,采用对拉钢板连接节点的试件能够显著提高试件的屈服荷载和极限承载力,其受拉区裂缝得到明显的抑制,有效提高了压弯节点截面刚度,且表现出较好的延性;随着偏心距的增大,对拉钢板对压弯节点的屈服荷载和极限荷载特征值提高幅度逐渐增加。

In order to study the mechanical properties of the joints of the prefabricated concrete column with grout-filled coupling sleeves and improve the connection mode of the joints,three joints are fabricated by grout-filled coupling sleeves,the other three joints are adopted by grout-filled coupling sleeves and double pretension steel plates.The test data such as bearing capacity,the longitudinal deformation and the stress change of the material are obtained under axial loading.Based on the test data,the results show that the concrete column joints with grout-filled coupling sleeves and double pretension steel plates agree with flat section assume during the process of stress.The joints with grout-filled coupling sleeves and double pretension steels can significantly improve the yield load and ultimate bearing capacity of joints under eccentric compression,the cracks in the tension zone are obviously suppressed,and it effectively improves the compression bending joints’section stiffness and shows good ductility.With the increase of eccentricity,the eigenvalues of yield load and ultimate load of double pretension steel plates acting on concrete column joints increase gradually.