页岩陶粒混凝土预制构件钢筋浆锚连接性能试验研究
Experimental analysis on connection performance of grouted steel bars in prefabricated shale ceramsite concrete components

为了验证页岩陶粒混凝土预制构件纵向受力钢筋采用浆锚连接的适用性和可靠性，对采用该连接形式的钢筋连接试件分别进行了单向拉伸、高应力反复拉压和大变形反复拉压试验，分析页岩陶粒混凝土强度和钢筋搭接长度对其连接性能的影响。试验结果表明：所有试件纵筋均未出现滑移，试件的最终破坏均为接头外钢筋被拉断或屈服；采用浆锚连接的钢筋搭接长度不宜小于1.0laE；当钢筋搭接长度大于等于1.0laE时，随着页岩陶粒混凝土强度的增加，试件接头的极限抗拉强度有所提高。在满足规定的构造要求下，钢筋浆锚连接形式可用于页岩陶粒混凝土预制构件纵向受力钢筋的可靠连接。
In order to verify the applicability and reliability of longitudinal reinforcing steel grouted connecting in prefabricated components of shale ceramsite concrete, specimens were tested under monotonic tension test, high strength cyclic load test and large deformation cyclic load test. The influencing factors on connection performance including the strength of shale ceramsite concrete and lapping length of steel were analyzed. The test results indicate that no slippage occurs in all specimens' longitudinal steel, and the ultimate failure of all specimens are steel outside the splice broken up or yielding. It is suggested that the lapping length of grouted steel should not be less than 1.0laE. When the lapping length of steel is greater than or equal to 1.0laE, the ultimate tensile strength of splice will be increased with the higher strength of shale ceramsite concrete. The grouted connecting is suitable for the reliable connection of longitudinal reinforcing steel in prefabricated components of shale ceramsite concrete, when it satisfies certain structural requirements.