不锈钢—混凝土—碳素钢中空夹层梁受弯力学性能试验研究及仿真分析

发布时间：2018-07-05 10:21

本文选题：不锈钢-混凝土-碳素钢中空夹层梁 + 极限弯矩　；参考：《太原理工大学》2017年硕士论文

【摘要】：传统CFDST作为一种新型的组合结构形式,具有承载能力高、塑性与韧性好、施工便利、耐火性好、经济效果较好、截面开展与抗弯刚度大、自重轻及抗震好等诸多优点,是一种应用前景非常广阔的结构形式,但其较差的抗腐蚀性也大大限制了其应用范围。不锈钢不仅具有强度高、塑性及韧性好等优点,还具有良好的耐腐蚀性,但其造价昂贵,这也决定了其在工程中不可能大量使用。将传统CFDST构件的外包钢管换成不锈钢,则组成的新型构件就同时具有了上述两种构件的全部优点,这使得不锈钢-混凝土-碳素钢中空夹层组合结构在工程中的应用成为可能。本文主要使用试验研究与有限元模拟两种方法,来对不锈钢-混凝土-碳素钢中空夹层梁试件的受弯力学性能进行研究。本文开展的主要工作如下:(1)首先论文论述了相关课题的研究现状,即传统中空夹层钢管混凝土构件的研究现状和不锈钢管混凝土构件的研究现状,同时提出了本文研究的主要内容。(2)将空心率和剪跨比作为主变因素,对18根不锈钢-混凝土-碳素钢中空夹层梁试件开展了试验研究,来分析上述因素对试件受弯力学性能的影响,试验得到了试件的破坏形态及荷载-变形关系曲线。(3)在准确选择不锈钢、夹层混凝土及碳素钢本构关系模型的基础上,使用有限元软件ABAQUS对梁试件进行了建模,对试件的破坏形态、荷载-变形关系曲线及承载力展开了计算。经过比较,有限元计算结果与试验结果符合较好,因此可使用有限元建模的方法对影响试件受弯力学性能的其它因素展开深入的分析。(4)使用经过试验验证的有限元模型,通过选择典型试件,对其在受弯荷载作用下的工作机理展开了分析。接着使用有限元建模的方法系统分析了剪跨比、空心率、约束效应系数、内钢管厚度、不锈钢类型及内钢管强度等级对试件跨中弯矩-挠度关系曲线及极限弯矩的影响。最后采用有限元建模的方法对比分析了不锈钢-混凝土-碳素钢中空夹层梁试件与传统中空夹层钢管混凝土梁试件在受弯力学性能方面的差异。
[Abstract]:As a new type of composite structure, traditional CFDST has many advantages, such as high bearing capacity, good ductility and toughness, convenient construction, good fire resistance, good economic effect, large cross-section development and bending stiffness, light weight and good seismic resistance. It is a kind of structure with broad application prospect, but its poor corrosion resistance also limits its application scope. Stainless steel not only has the advantages of high strength, good ductility and toughness, but also has good corrosion resistance, but its cost is expensive, which also determines that it can not be widely used in engineering. By replacing the steel pipe of the traditional CFDST member with stainless steel, the new type of member has all the advantages of the above two kinds of members at the same time, which makes the application of the composite structure of stainless steel, concrete and carbon steel hollow sandwich in engineering possible. In this paper, the bending mechanical properties of stainless steel, concrete and carbon steel hollow sandwich beams are studied by means of experimental study and finite element simulation. The main work of this paper is as follows: (1) first of all, the paper discusses the research status quo of related topics, that is, the traditional hollow sandwich concrete filled steel tube members and stainless steel tube concrete members research status quo. At the same time, the main contents of this paper are put forward. (2) taking hollow ratio and shear span ratio as main factors, 18 specimens of stainless steel, concrete and carbon steel hollow sandwich beams are studied experimentally. In order to analyze the influence of the above factors on the bending mechanical properties of the specimens, the failure patterns and load-deformation relationship curves of the specimens are obtained. (3) on the basis of selecting the constitutive relation models of stainless steel, sandwich concrete and carbon steel accurately, The finite element software Abaqus is used to model the beam specimen, and the failure mode, load-deformation curve and bearing capacity of the specimen are calculated. Compared with the experimental results, the finite element method can be used to analyze the other factors that affect the bending mechanical properties of the specimen. (4) the finite element model is used to verify the bending behavior of the specimen. By selecting the typical specimen, the working mechanism of the specimen under the action of bending load is analyzed. Then the effects of shear span ratio, heart rate, constraint effect coefficient, thickness of inner steel tube, type of stainless steel and strength grade of inner steel tube on the relationship between moment and deflection and ultimate moment of the specimen are systematically analyzed by using finite element modeling method. Finally, the difference of bending mechanical properties between the specimens of stainless steel concrete-carbon steel hollow sandwich beam and the traditional hollow sandwich steel tube concrete beam is analyzed by using finite element modeling method.
【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

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