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对25个内壁设置栓钉的钢管混凝土柱大尺寸试件进行推出试验,以研究钢管混凝土柱内界面黏结强度及内壁栓钉受剪承载力。其中方钢管混凝土柱试件的截面尺寸均为600 mm×600 mm,圆钢管混凝土柱试件直径为600 mm,钢管壁厚分别为20、30 mm。设计主要参数为钢管混凝土柱的截面形状、填充混凝土的强度等级、钢管壁厚、钢管内壁粗糙程度以及内壁焊接栓钉的纵横向间距、栓钉直径和栓钉长度等。试验结果表明,工程应用低估了足尺钢管混凝土柱的界面黏结力与内壁设置栓钉的受剪承载力。依据试验结果提出了方钢管混凝土柱内栓钉受剪承载力的基本计算方法,以期为相关工程结构设计提供参考。
Thirty-five large-wall specimens of large-diameter concrete-filled steel tubular columns with inner pegs were tested in order to study the interfacial bonding strength and the shear strength of inner pegs. The cross-sectional dimensions of the square concrete-filled steel tubular columns are both 600 mm × 600 mm, the diameter of the concrete filled CFST columns is 600 mm, and the wall thickness of the steel pipe is respectively 20,30 mm. The main parameters of the design are the cross-sectional shape of the concrete-filled steel tubular column, the strength grade of the filled concrete, the wall thickness of the steel pipe, the roughness of the inner wall of the steel pipe, the vertical and horizontal spacings of the welding studs on the inner wall, the diameter of the studs and the length of the studs. The test results show that the engineering application underestimates the interfacial adhesion of full-height concrete-filled steel tubular columns and the shearing bearing capacity of the inner wall studs. Based on the test results, the basic calculation method of the shear bearing capacity of the square steel tube column with studs is put forward in order to provide references for the related engineering structure design.