桁架式型钢混凝土异形柱正截面承载力的试验研究

Experimental research on the bearing capacity of normal cross section of truss type steel reinforced concrete special-shaped columns

根据异形柱截面特点和型钢混凝土结构的粘结力特性,设计4根内含桁架式型钢骨架的不对称T形截面型钢混凝土异形柱试件,进行轴心和偏心压力(包括双偏压)作用下的试验研究,以揭示桁架式型钢混凝土异形柱的工作机理、破坏形态和极限承载力.试验结果表明:桁架式型钢混凝土异形柱的破坏过程与普通钢筋混凝土构件相似,横截面的平均应变基本符合平截面假定,型钢和混凝土能够保持协同工作直至极限承载力破坏,试件破坏时型钢没有屈曲.初步掌握了桁架式型钢混凝土异形柱正截面承载力破坏的一般规律,得出了桁架式型钢混凝土异形柱的承载能力比普通钢筋混凝土异形柱有明显提高的结论.

Based on the section trait of special-shaped columns and the bond character of steel reinforced concrete structure （SRC）, 4 truss type SRC special-shaped columns specimens with asymmetrical T-shaped eross-seetion,are designed, subject to axial loading or biaxial eccentric loading. The experimental results show that the failure mode is similar to reinforeed concrete （RC） structure. The shaped steel and concrete can work together til the ultimate bearing capacity failure fakes place, and partly longitudinal reinforcements buckle and deform outside where the eoncrete crushed. On the basis of the experimental research, this paper reveals the action behavior, failure patterns and ultimate bearing capacity of this type of columns, examines the hypothesis of plan cross-section of average strain, preliminary obtains the general variation regularity of failure of truss type SRC special-shaped columns and finds the bearing capacity of SRC special-shaped columns has more obviously improved than that of RC special-shaped columns.