不锈钢—混凝土—钢管组合柱力学性能的试验研究与理论分析

发布时间：2018-04-26 11:12

本文选题：中空夹层钢管混凝土(CFDST) + 不锈钢　；参考：《太原理工大学》2017年硕士论文

【摘要】：中空夹层钢管混凝土柱是在实心钢管混凝土柱的基础上发展起来的一种新型组合结构,其是由两个同心的内、外钢管和钢管夹层灌注混凝土而形成的构件。中空夹层钢管混凝土柱在拥有实心钢管混凝土结构优点的基础上,还具备自重轻、截面开展、抗弯刚度大的特点。虽然拥有诸多优点,但最外层钢管耐腐蚀性较差,导致在实际工程中的运用带有局限性,如桥墩、海洋平台结构的支架柱以及灌注桩等对耐腐蚀性要求较高的重要结构。不锈钢因其拥有耐腐蚀性、耐高温、强度高、延性好及维护费用低等优点,故采用不锈钢来代替普通碳素钢可以大大改善其受力性能,从而出现一种新型钢-混凝土组合结构,本文称之为不锈钢-混凝土-钢管组合结构。通过试验与有限元模拟相结合的方法,对不锈钢-混凝土-钢管组合柱的轴压性能和偏压性能分别展开了研究,主要内容包括:(1)对24根不锈钢-混凝土-钢管组合柱的受力性能进行了试验研究,其中,包括6根轴压短柱和18根偏压长柱。短柱以截面空心率为主要变化参数,长柱以截面空心率、长细比、偏心率为主要变化参数。试验结果表明:对于轴压短柱,随截面空心率的增大,其轴压极限承载力减小;对于偏压长柱,随长细比、空心率、偏心率的增加,其抗弯刚度和极限承载力降低。(2)将试验得到的轴压极限承载力和偏压极限承载力与按修正的《钢管混凝土结构技术规程》(DBJ13-51-2003)轴压稳定承载力和偏压稳定承载力设计公式计算值进行对比分析,讨论了利用修正的《钢管混凝土结构技术规程》轴压稳定承载力和偏压稳定承载力设计公式来指导不锈钢-混凝土-钢管组合柱工程设计的可行性。(3)在试验的基础上,建立了不锈钢-混凝土-钢管组合柱的轴压和压弯受力性能有限元分析模型,在模型中引入构件的整体几何缺陷,将计算得到的荷载-位移曲线和极限承载力与试验结果对比。结果表明:其计算结果与试验结果吻合较好。(4)利用有限元模型,分析了整体几何缺陷、空心率、混凝土强度、内管径厚比、偏心率对构件承载力的影响。
[Abstract]:Hollow sandwich concrete-filled steel tubular column is a new type of composite structure developed on the basis of solid concrete-filled steel tube column. It is a member formed by two concentric inner and outer steel tubes and concrete-filled steel tube sandwich. The hollow sandwich concrete-filled steel tubular column has the advantages of solid concrete-filled steel tubular structure, light weight, section development and large flexural stiffness. Although it has many advantages, the outermost steel pipe has poor corrosion resistance, which leads to the limitation of its application in practical engineering, such as bridge piers, supporting columns of offshore platform structures and cast-in-place piles, which are important structures with high corrosion resistance. Because stainless steel has the advantages of corrosion resistance, high temperature resistance, high strength, good ductility and low maintenance cost, the mechanical properties of stainless steel can be greatly improved by using stainless steel instead of ordinary carbon steel, thus a new steel-concrete composite structure appears. This paper is called stainless steel-concrete-steel pipe composite structure. In this paper, the axial compression behavior and the partial compression performance of the stainless steel concrete-steel pipe composite column are studied by means of the combination of test and finite element simulation. The mechanical properties of 24 stainless steel concrete-steel pipe composite columns are studied including 6 short columns under axial compression and 18 long columns with partial compression. The main variation parameters of the short column are the hollow ratio of the section, the ratio of the length to the diameter and the eccentricity of the long column. The experimental results show that the ultimate bearing capacity decreases with the increase of the hollow ratio of the axial compression column, and increases with the increase of the slenderness ratio, the empty heart rate and the eccentricity of the long column. Its flexural stiffness and ultimate bearing capacity are reduced. 2) the axial compression ultimate bearing capacity and the eccentric compression ultimate bearing capacity obtained from the test are compared with the modified concrete filled Steel Tubular structure Technical Specification / DBJ13-51-2003) the axial compression stability bearing capacity and the eccentric compressive stability bearing capacity are designed. The calculated values of the formula are compared and analyzed. This paper discusses the feasibility of guiding the engineering design of stainless steel concrete-steel tube composite columns by using the revised design formula of axial compression stable bearing capacity and eccentric compressive stability bearing capacity of concrete filled steel tube structure. On the basis of the experiment, the paper discusses the feasibility of designing stainless steel concrete-steel tube composite columns. The finite element analysis model of axial compression and bending behavior of stainless steel concrete-steel pipe composite columns is established. The integral geometric defects of members are introduced into the model. The calculated load-displacement curve and ultimate bearing capacity are compared with the experimental results. The results show that the calculated results are in good agreement with the experimental results. (4) by using the finite element model, the effects of geometric defects, heart rate, concrete strength, diameter to thickness ratio and eccentricity on the bearing capacity of the members are analyzed.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.9

【参考文献】