弱黏结薄壁圆钢管混凝土短柱轴心受压试验  

Axial compression test of concrete-filled thin-walled steel circular tube short column with weak interface bonding

作　　者：张文江[1] 孟志良[2] 白永兵[2] 苏胜昔[1] 杜二霞[1] 

机构地区：[1]河北大学建筑工程学院,河北保定071002 [2]河北农业大学城乡建设学院,河北保定071001

出　　处：《铁道建筑》2015年第9期45-49,共5页Railway Engineering

基　　金：河北大学自然科学研究计划项目(2013-261)

摘　　要：对5个薄壁钢管混凝土短柱进行了轴心受压试验。其中3个试件的钢管内壁与混凝土间的黏结作用被削弱,以研究此状态下核心混凝土与外钢管间荷载的传递方式、外钢管的受力状态以及试件的破坏模式。试验结果表明:削弱核心混凝土与外钢管间的黏结作用造成加载端混凝土的荷载份额增大,在该部分发生局部破坏的可能性增大,钢管纵深部分承担的荷载减少;混凝土内部设置钢管可以增强混凝土的承载能力,同时有利于荷载向纵深传递,使荷载在较大区域内均匀分布,有利于材料性能的充分发挥,可以作为钢管削弱或者核心混凝土与钢管间黏结作用削弱条件下提高承载力的一种构造措施。The paper carries out Axial compressive tests on f ive round thin-walled steel-pipe-reinforced concrete short columns with the purpose of uncovering the loading transmission between the core concrete and the steel pipe,the force-bearing performance of the pipe and the failure process of the study objects.It is noticed in three specimens that the adhesive performance at steel-concrete interface is weakened,which triggers the increase of loading born by the concrete at the impulsion end,while the vertical loading on the steel pipe is somehow eased.Therefore,there is a greater chance for the impulsion end of the specimen to encounter local failure.On this basis, the paper concludes that the steel pipe embedded helps improve the bearing capacity of the concrete,and at the same time the design is conducive to the vertical transmission and an even loading distribution.As the material potential is now fully tapped, the scheme shall be introduced as a structural measure to improve bearing capacity in case of weakened steel pipe or weakened interface adhesion.

关 键 词：界面弱黏结 钢管混凝土 薄壁 短柱 轴压试验 

分 类 号：TU375.3[建筑科学—结构工程]