外包陶粒混凝土T形钢短柱轴心受压试验研究  

EXPERIMENTAL RESEARCH ON SHORT T-SHAPED STEEL COLUMN WRAPPED WITH CERAMSITE CONCRETE UNDER AXIAL COMPRESSION

作　　者：刘学春[1] 段嘉琪 LIU Xuechun;DUAN Jiaqi(Beijing Engineering Research Center of High-Rise and Large-Span Pre-Stressed Steel Structures,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学,北京市高层和大跨度预应力钢结构工程技术研究中心,北京100124

出　　处：《工业建筑》2021年第5期116-123,共8页Industrial Construction

基　　金：国家自然科学基金项目(51978013);十三五重大专项(2016YFC0701100)。

摘　　要：提出一种外包陶粒混凝土T形钢柱。以保温隔热、抗渗性良好的钢筋陶粒混凝土作为包裹材料,采用试验和有限元分析方法,对高1.72 m的T形柱在轴向压力下的力学性能进行研究。对比分析包裹层箍筋端部是否与型钢腹板焊接连接对柱子承载力的影响。研究表明:陶粒混凝土在极限荷载后才发生明显开裂和脱落,混凝土包裹层和型钢黏结效果较好;混凝土包裹层使型钢柱强度充分利用,型钢可达到屈服强度;混凝土的包裹对型钢产生有效约束,破坏前型钢未发生明显局部和整体失稳,提高了试件延性和承载力。箍筋端部与型钢腹板焊接与否,对试件承载力影响不大,焊接加强了箍筋端与型钢的连接从而约束纵筋变形,减轻对混凝土的破坏。A kind of T-shaped steel column wrapped with ceramsite concrete was proposed. With the good thermal insulation and impermeability performance of ceramsite concrete, it has been used as covering material to improve column’s insulated and fireproof performances. Axial compression test and finite element analysis were carried out on two 1 720 mm high T-shaped columns to obtain the mechanical properties. The effects of stirrup end and steel web welded or not on the bearing capacity of specimens were discussed. The results indicated that the obvious cracking and ceramsite concrete’s falling off did not occur until arrived the ultimate load, which proved that the concrete and steel had good bonding effects. Benefiting from the concrete cover, the strength of the steel column was fully utilized and the steel might reach the yield strength. Because ceramsite concrete provided an effective restraint for the inner steel, the local and overall buckling of the steel column were avoided, and the ductility and bearing capacity of the specimen were improved. Welding stirrup ends on the web of T-shaped steel had little effect on the bearing capacity of the specimen. The connections between the stirrup ends and steel were strengthened, which constrained the deformation of longitudinal reinforcement and reduced the damage of concrete.

关 键 词：陶粒混凝土 混凝土包裹钢 T形钢柱 轴压试验 

分 类 号：TU398.9[建筑科学—结构工程]