钢管轻骨料混凝土粘结滑移试验研究
发布时间：2019-03-07 16:30
【摘要】：钢管混凝土是钢管套箍混凝土的简称。它是将混凝土填入薄壁钢管内而形成的组合结构材料,是约束混凝土的一种特殊形式。钢管混凝土结构具有较高的承载力和抗震性能、施工快速简便、占用空间少、结构自重小和经济效果好等优势,具有良好的工程应用前景。钢管轻骨料混凝土是在钢管中填充高强度的轻骨料混凝土而形成的一种新型组合结构,具有强度高、延性好和自重轻等优点,将其推广应用到桥梁房屋工程具有显著的经济和社会应用效益。钢管轻骨料混凝土柱的力学性能相关的研究工作,需要对钢管轻骨料混凝土柱的粘结滑移整体分析与粘结强度等相关数据进行深入分析研究,相关研究工作对于钢管轻骨料混凝土柱具有重要的理论意义和工程实用价值。本文主要从试验的角度较深入地研究了钢管轻骨料混凝土界面粘结性能。本文试验分两部分,首先是以钢管轻骨料混凝土柱试件进行轴心推出试验;随后引用相关文献普通钢管混凝土粘结滑移试验数据与其作对比分析研究。本文具体做了以下几方面的工作:(1)通过钢管轻骨料混凝土柱的推出试验,试验得到的位移-荷载曲线的发展有无下降段主要原因在于,钢管轻骨料混凝土中的钢管与核心混凝土之间的机械咬合力产生的最大粘结荷载大于(或小于)钢管与核心轻骨料混凝土界面的初始摩阻力。(2)根据钢管轻骨料混凝土推出试验,当构件位移-荷载曲线发展到摩阻阶段时,钢管的紧箍系数相对越大,钢管与核心轻骨料混凝土之间的摩阻力越大。(3)根据钢管轻骨料混凝土推出试验,当试件长细比一致的情况下,紧箍系数对粘结破坏强度和其相应的位移有一定的影响,构件的紧箍系数与粘结破坏强度的变化相同,与其对应位移的变化相反。(4)根据钢管轻骨料混凝土推出试验,钢管轻骨料混凝土,在相同紧箍系数的情况下,长细比大的试件,其相应粘结破坏强度对应的位移大。(5)普通钢管混凝土紧箍系数相同,粘结破坏荷载对应位移随长细比增大逐渐递增,与钢管轻骨料混凝土关于长细比与粘结破坏荷载对应位移关系规律相同。
[Abstract]:Concrete-filled steel tube (CFST) is the abbreviation of steel tube hoop concrete. It is a kind of composite structure material which is formed by filling concrete into thin-walled steel tube, and it is a special form of restricting concrete. The concrete-filled steel tube structure has the advantages of high bearing capacity and anti-seismic performance, rapid and simple construction, less occupied space, small self-weight of the structure and good economic effect, so it has a good prospect for engineering application. Lightweight aggregate concrete in steel tube is a new type of composite structure which is filled with high strength lightweight aggregate concrete. It has the advantages of high strength, good ductility and light weight, etc. It has remarkable economic and social application benefit to popularize and apply it to bridge building engineering. The research work related to the mechanical properties of lightweight aggregate concrete filled steel tube columns requires in-depth analysis of bond-slip integral analysis and bond strength data of lightweight aggregate concrete columns in steel tubes. The relevant research work has important theoretical significance and engineering practical value for CFST columns. In this paper, the interfacial bonding behavior of lightweight aggregate concrete filled steel tube (CFST) is studied in detail from the experimental point of view. This paper is divided into two parts. Firstly, the axial push-out test is carried out with the lightweight aggregate concrete filled steel tube column, and then the common concrete-filled steel tube bond-slip test data are used for comparative analysis and analysis. The following works have been done in this paper: (1) the development of the displacement-load curve obtained from the test is mainly due to the decrease of the displacement-load curve through the push-out test of the lightweight aggregate concrete column with steel tube. The maximum bond load produced by mechanical clamping force between steel tube and core concrete in lightweight aggregate concrete filled steel tube is greater than (or less than) the initial friction resistance of the interface between steel tube and core lightweight aggregate concrete. (2) according to light steel tube, the maximum bond load is greater than or less than the initial friction resistance. Aggregate concrete push-out test, When the displacement-load curve of the member develops to the friction stage, the bigger the fastening coefficient of the steel tube is, the greater the friction resistance between the steel tube and the core lightweight aggregate concrete is. (3) according to the derivation test of the lightweight aggregate concrete of the steel tube, When the slenderness ratio of the specimen is the same, the fastening coefficient has a certain effect on the bond failure strength and its corresponding displacement, and the change of the fastening coefficient of the member is the same as that of the bond failure strength. In contrast to the corresponding displacement changes. (4) according to the test of lightweight aggregate concrete-filled steel tube (CFST), lightweight aggregate concrete (CFST), with the same fastening coefficient, has a large slenderness ratio. The corresponding displacement corresponding to bond failure strength is large. (5) the coefficient of fastening hoop of concrete filled steel tube is the same, and the corresponding displacement of bond failure load increases gradually with the increase of slenderness ratio. The displacement relation between slenderness ratio and bond failure load is the same as that of lightweight aggregate concrete in steel tube.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
本文编号：2436267
[Abstract]:Concrete-filled steel tube (CFST) is the abbreviation of steel tube hoop concrete. It is a kind of composite structure material which is formed by filling concrete into thin-walled steel tube, and it is a special form of restricting concrete. The concrete-filled steel tube structure has the advantages of high bearing capacity and anti-seismic performance, rapid and simple construction, less occupied space, small self-weight of the structure and good economic effect, so it has a good prospect for engineering application. Lightweight aggregate concrete in steel tube is a new type of composite structure which is filled with high strength lightweight aggregate concrete. It has the advantages of high strength, good ductility and light weight, etc. It has remarkable economic and social application benefit to popularize and apply it to bridge building engineering. The research work related to the mechanical properties of lightweight aggregate concrete filled steel tube columns requires in-depth analysis of bond-slip integral analysis and bond strength data of lightweight aggregate concrete columns in steel tubes. The relevant research work has important theoretical significance and engineering practical value for CFST columns. In this paper, the interfacial bonding behavior of lightweight aggregate concrete filled steel tube (CFST) is studied in detail from the experimental point of view. This paper is divided into two parts. Firstly, the axial push-out test is carried out with the lightweight aggregate concrete filled steel tube column, and then the common concrete-filled steel tube bond-slip test data are used for comparative analysis and analysis. The following works have been done in this paper: (1) the development of the displacement-load curve obtained from the test is mainly due to the decrease of the displacement-load curve through the push-out test of the lightweight aggregate concrete column with steel tube. The maximum bond load produced by mechanical clamping force between steel tube and core concrete in lightweight aggregate concrete filled steel tube is greater than (or less than) the initial friction resistance of the interface between steel tube and core lightweight aggregate concrete. (2) according to light steel tube, the maximum bond load is greater than or less than the initial friction resistance. Aggregate concrete push-out test, When the displacement-load curve of the member develops to the friction stage, the bigger the fastening coefficient of the steel tube is, the greater the friction resistance between the steel tube and the core lightweight aggregate concrete is. (3) according to the derivation test of the lightweight aggregate concrete of the steel tube, When the slenderness ratio of the specimen is the same, the fastening coefficient has a certain effect on the bond failure strength and its corresponding displacement, and the change of the fastening coefficient of the member is the same as that of the bond failure strength. In contrast to the corresponding displacement changes. (4) according to the test of lightweight aggregate concrete-filled steel tube (CFST), lightweight aggregate concrete (CFST), with the same fastening coefficient, has a large slenderness ratio. The corresponding displacement corresponding to bond failure strength is large. (5) the coefficient of fastening hoop of concrete filled steel tube is the same, and the corresponding displacement of bond failure load increases gradually with the increase of slenderness ratio. The displacement relation between slenderness ratio and bond failure load is the same as that of lightweight aggregate concrete in steel tube.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9
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