College of Civil Engineering, Taiyuan University of Technology

【目的】普通钢管混凝土异形柱适用高度低且阴角处钢管和混凝土易脱离。【方法】将三个方钢管混凝土柱焊接形成L形组合异形柱,并将100MPa以上的超高强灌浆料应用于组合异形柱中,通过试验研究不同灌浆料强度和钢管壁厚对其轴压性能的影响。【结果】结果表明:含有超高强灌浆料的组合异形柱的轴压承载能力较纯钢异形柱提高92%~170%,且随着高强灌浆料强度的增加,钢管对高强灌浆料的约束作用减小,试件延性提高;钢管壁厚从4mm增大到6mm,可有效抑制局部发生鼓曲,构件破坏形式从鼓曲破坏为主变成弯曲变形为主,试件延性平均增大50%以上。最后,将轴压承载力试验结果与国内外8本现行规范中轴压承载力计算公式得到的结果进行对比,采用规范AISC360所得计算值最接近试验结果。研究结果可提高组合异形柱的轴压承载力与延性,并改善阴角处钢管和混凝土易脱离的问题,助力超高强灌浆料在钢管混凝土异形柱结构中的应用和推广。

【Purposes】 This research is conducted to solve the problems of the low applicable height of ordinary concrete-filled steel tubular special-shaped columns and the easy separation of steel tube and concrete at the internal corner. 【Methods】 Three concrete-filled square steel tubular col⁃ umns were welded to form an L-shaped composite special-shaped column, and ultra-high-strength grouting material with standard compressive strength greater than 100 MPa was used in the composite L-shaped columns. The influences of different grouting material strengths and steel tube wall thick⁃ nesses on their axial compression performances were studied through experiments. 【Findings】The re⁃ sults show that the axial compression bearing capacity of composite L-shaped columns with ultra- high-strength grouting materials is 92%-170% higher than that of pure steel L-shaped columns. With the increase of the strength of high-strength grouting materials, the restraining effect of steel pipe on high-strength grouting material decreases, and the ductility of the specimen increases. The wall thick⁃ ness of the steel pipe increases from 4 to 6 mm, which can effectively prevent local buckling. The fail⁃ ure mode of the component changes from buckling failure to bending deformation, and the ductility of the specimen increases by more than 50% on average. By comparing the results of the axial compres⁃ sion bearing capacity test with the results obtained from the axial compression bearing capacity calcula⁃ tion formula in 8 current codes at home and abroad, the calculated value obtained by using the specifi⁃ cation AISC 360 is the closest to the test result. The research results can improve the axial compres⁃ sion bearing capacity and ductility of the composite special-shaped columns, improve the problem that the steel tube and concrete are easily separated at the internal corners, and help the application and pro⁃ motion of ultra-high-strength grouting materials in the structure of concrete-filled steel tube special- shaped columns.

国家自然科学基金资助项目(52278198)

常欣昱,周燕,雷宏刚.L形方钢管高强灌浆料组合异形柱轴压性能试验研究[J].太原理工大学学报,2025,56(2):224-234.

CHANG Xinyu,ZHOU Yan,LEI Honggang.Axial compressive performance of L-shaped high strength grouting material filled square steel tube[J].Journal of Taiyuan University of Technoloty,2025,56(2):224-234.