带孔板灌浆套管连接受弯性能研究OA

As critical load-transfer components in prefabricated structures,the mechanical performance of connection directly governs the overall structural safety and reliability.This study proposes a novel grouted sleeve connection with perforated inner steel tubes and systematically investigates its load-transfer mechanism and failure modes through three-point bending tests on twelve full-scale specimens.A comprehensive analysis is conducted on the influence of key parameters—including inner tube length,width-to-thickness ratio,perforation geometry,and steel fiber content in grout—on connection flexural resistance,stiffness and ductility.The test results demonstrate that the primary failure involves shear-induced slip of the grout accompanied by inner tube fracture,with inner tube length,perforation shape,and stud arrangement pattern identified as dominant factors affecting flexural performance.By integrating elastoplastic theory with experimentally observed strain distribution patterns,an analytical model to predict flexural resistance is developed,showing excellent agreement with test results.These findings provide both experimental validation and theoretical foundations for optimizing grouted-perforated inner tube sleeve connections.