太原理工大学学报2025，Vol.56Issue(2)：224-234,11.DOI:10.16355/j.tyut.1007-9432.20220922
L形方钢管高强灌浆料组合异形柱轴压性能试验研究
Axial Compressive Performance of L-Shaped High Strength Grouting Material Filled Square Steel Tube
摘要
Abstract
[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.关键词
L形异形柱/轴心受压/力学性能/试验研究Key words
L-shaped special-shaped column/axial compression/mechanical property/experi-mental study分类
建筑与水利引用本文复制引用
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):224-234,11.基金项目
国家自然科学基金资助项目(52278198) （52278198）
