方形钢管混凝土叠合压弯构件力学性能和设计方法研究

发布时间：2018-04-21 09:06

  本文选题：钢管混凝土叠合构件 + 压弯　； 参考：《清华大学》2015年博士论文

【摘要】：钢管混凝土叠合构件具有良好的力学性能,受到工程界的关注。在对叠合构件工作机理深入研究的基础上,确定设计方法非常必要。本文研究了方形钢管混凝土叠合压弯构件的力学性能和设计方法,具体构件是圆形钢管混凝土在中间,外围包裹方形钢筋混凝土(文中称钢管混凝土叠合构件),以及由方形空心钢筋混凝土和四个角部的圆形钢管混凝土组成(文中称空心钢管混凝土叠合构件)。本文进行的主要工作和成果为:1.建立了钢管混凝土叠合构件的精细化实体有限元模型,该模型考虑了不同材料的本构关系模型和钢管与混凝土的接触关系,并经过试验验证。利用该有限元模型进行了该构件在轴压、压弯以及受弯下的全过程分析,研究其破坏形态、材料应力分布、钢管与混凝土接触关系、传力机制和钢管混凝土与钢筋混凝土部件的内力分配。对比了叠合构件与钢管混凝土和钢筋混凝土构件的受力性能。2.进行了空心钢管混凝土叠合构件在轴压、压弯和受弯下的试验研究。研究参数包括配箍率(轴压),偏心距和长细比(压弯),以及剪跨比(受弯),探究其破坏形态、传力机制和参数影响规律。3.基于钢管混凝土叠合构件的精细化有限元模型,充分考虑自身空心构件的特点,即将混凝土按不同约束程度进行划分,建立了空心钢管混凝土叠合构件的精细化实体有限元模型,并经过试验验证。进行了该类构件在轴压、压弯以及受弯下的全过程分析,研究其破坏形式、材料应力变化规律、钢管与混凝土接触关系和钢管混凝土与钢筋混凝土部件的内力分配。对比研究了叠合构件与钢筋混凝土以及钢管混凝土构件的受力性能。4.研究了钢筋混凝土部件和钢管混凝土部件的相关参数以及二者几何尺寸比例(D/B)对压弯性能的影响规律。在此基础上提出了方形钢管混凝土叠合压弯构件的承载力设计方法和相关设计建议。通过编写不同材料子程序和不同截面部件的组合,建立了方形钢管混凝土叠合结构的纤维梁模型,实现了基于纤维梁模型的钢管混凝土叠合结构的整体抗震分析。
[Abstract]:Concrete filled steel tube (CFST) composite members have good mechanical properties and have attracted much attention in engineering field. On the basis of studying the working mechanism of superimposed members, it is necessary to determine the design method. In this paper, the mechanical properties and design method of concrete filled square steel tube (CFST) members are studied. The concrete members are circular concrete-filled steel tubes (CFST) in the middle. The outer wrapped square reinforced concrete (CFST) composite member is composed of square hollow reinforced concrete (CFST) and circular concrete-filled steel tube (CFST) with four corners. The main work and result of this paper is: 1. 1. The fine solid finite element model of concrete filled steel tube (CFST) composite member is established. The constitutive relation model of different materials and the contact relationship between steel tube and concrete are considered in this model, and the model is verified by experiments. The finite element model is used to analyze the whole process of the component under axial compression, bending and bending. The failure pattern, stress distribution of material and the contact relationship between steel tube and concrete are studied. Force transfer mechanism and internal force distribution between concrete filled steel tube and reinforced concrete components. The mechanical behavior of composite members is compared with that of concrete filled steel tube and reinforced concrete members. The experimental study of concrete filled hollow steel tube (CFST) composite members under axial compression, compression and bending was carried out. The research parameters include hoop ratio (axial compression ratio, eccentricity and slenderness ratio) and shear span ratio (bending). Based on the finer finite element model of concrete-filled steel tubular composite members and considering the characteristics of its hollow members, the concrete is divided according to different degree of constraint. The finer solid finite element model of concrete filled hollow steel tube (CFST) composite member is established and verified by experiments. In this paper, the whole process analysis of this kind of members under axial compression, bending and bending is carried out, and the failure mode, material stress change, the contact relationship between steel tube and concrete and the internal force distribution of concrete filled steel tube and reinforced concrete are studied. The mechanical behavior of composite members, reinforced concrete and concrete-filled steel tube members is studied. The influence of the parameters of reinforced concrete and concrete-filled steel tube (CFST) components and the ratio of their geometric dimensions (D / B) on the compressive and bending properties were studied. On this basis, the bearing capacity design method and relevant design suggestions of square concrete filled steel tube (CFST) members under compression and bending are put forward. The fiber beam model of square concrete filled steel tube (CFST) composite structure is established by compiling different material subroutines and different cross section components. The integral seismic analysis of CFST composite structure based on fiber beam model is realized.
【学位授予单位】：清华大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TU398.9
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本文编号：1781787