异形钢管混凝土短柱轴心受压力学性能试验研究

Experimental Study on Mechanical Properties under Axial Compression of Special-Shaped Concrete-Filled Steel Tubular Columns

目的:了解异形钢管混凝土短柱的受力、变形机制和破坏形态,着重考察约束效益系数对异形钢管混凝土短柱的力学性能影响。方法:设计制作了4个T形钢管混凝土短柱和4个L形钢管混凝土短柱,通过轴心受压试验来实测试件极限承载力和荷载-位移曲线,分析约束效益系数对异形钢管混凝土短柱力学性能的影响。结果:试件压坏现象明显,呈现出局部鼓曲或角部开裂两种破坏形态,且开裂集中在T形试件腹板处和L形试件内角处。结论:提高约束效益系数能有效提高试件极限承载力和改善试件后期承载能力;试件工作状态可分为三个阶段;T形试件腹板处和L形试件内角处易出现应力集中。

In order to know the destruction form,mechanical and distortion,the constraint factor＇s influence on the special - shaped concrete - filled steel tubular columns was especially investigated. 4 short columns of T - shaped concrete - filled steel tube and 4 L - shaped concrete - filled steel tubular short columns were designed and manufactured. The load - deformation curve and ultimate bearing capacity of the test specimen were measured by axial compression test. The experimental results showed that the failure modes of the short columns were mainly the local bending and corner cracking, and the cracking concentrated in the webs of the T - shaped columns and the inside corners of the L - shaped columns. The ultimate bearing capacity and later bearing capacity can be heightened obviously by increasing the constraint factor. The The stress concentrate in the webs of the T- operative mode of the test specimen can be divided shaped columns and the inside corners of the L- shaped into 3 stages. columns.