部分外包混凝土加固六边形孔蜂窝钢柱轴压试验

Axial Compression Test of Hexagonal Cell Honeycomb Steel Columns Reinforced by Partially Encased Concrete

为研究部分外包混凝土加固六边形孔蜂窝钢柱的轴压性能,以混凝土强度及系杆间距为参数,对1根六边形孔蜂窝钢柱及5根部分外包混凝土加固六边形孔蜂窝钢柱进行了轴压试验.结果表明:相较于未加固的六边形孔蜂窝钢柱,混凝土部分外包加固能有效提升六边形孔蜂窝钢柱的承载能力及耗能性能.对于部分外包混凝土加固六边形孔蜂窝钢柱而言,随着混凝土强度的上升,其承载能力和延性会逐渐提高,且能有效约束六边形孔洞周边的变形和焊缝撕裂问题.随着系杆间距的减小,柱体承载能力逐渐变大,但其延性和耗能会降低.轴压状态下,部分外包混凝土加固六边形孔蜂窝钢柱的孔洞应力基本呈对称分布,孔洞周边最大应力多分布于六边形孔棱角处.

In order to study the axial compressive performance of hexagonal cell honeycomb steel columns reinforced by partially encased concrete,taking concrete strength and tie rod spacing as parameters,axial compression test were carried out on 1 hexagonal cell honeycomb steel column and 5 hexagonal cell honeycomb steel columns reinforced by partially encased concrete.The results show that compared with the unreinforced hexagonal cell honeycomb steel column,reinforce column with partially encased concrete can effectively improve the bearing capacity and energy dissipation performance.For hexagonal cell honeycomb steel columns reinforced by partially encased concrete,the bearing capacity and ductility gradually increased with the increase of concrete strength,and the deformation and weld tearing problems around the hexagonal holes can be effectively restrained.As the tie rod spacing decreasing,the bearing capacity of the column gradually increased,but its ductility and energy dissipation decreased.Under the state of axial compression,the hole stress of the hexagonal cell honeycomb steel column reinforced by partially encased concrete was basically symmetrical,and the maximum stress around the hole was mostly distributed at the corners of the hexagonal hole.