【作者】 荣彬；

【导师】 陈志华；

【作者基本信息】 天津大学 ， 结构工程， 2006， 硕士

【摘要】 方钢管混凝土柱由于具有承载力高、抗震性能优越、防火性能好等特性,目前已成为住宅钢结构发展的一个主要方向。依据理论分析和钢管混凝土超声波检测试验结果,提出了采用叠加理论计算方钢管混凝土柱的论据。基于强度叠加理论的方钢管混凝土柱计算方法简单、物理意义明确、安全度高,可以方便地应用于实际工程设计中。通过分析现有叠加理论计算公式,指出了目前叠加理论中需要解决的三个主要问题,即轴压力分配、截面回转半径、整体承载力提高;并在此基础上,提出了本文的叠加理论计算公式。方钢管混凝土组合异形柱作为一种新的异形柱形式,是由单根方钢管混凝土柱通过缀件连接组合而成,其最突出的特点是具有灵活的截面形式。L形截面方钢管混凝土组合异形柱(LCFT)是主要柱形之一。由于在住宅建筑中应用异形柱,可以增加房间使用面积和空间、方便装修、美化整体效果等;因此,在全国大力推广住宅钢结构体系的背景下,方钢管混凝土组合异形柱将具有广阔的发展前景。在采用本文叠加理论公式计算LCFT过程中,推导了等效长细比公式,并通过已有的单根方钢管混凝土柱轴心受压试验数据,确定了钢管稳定性提高系数的取值。为了研究LCFT发生强度破坏和发生失稳破坏时的承载能力,分别设计制作了轴心受压试验的LCFT短柱试件和LCFT长柱试件。进行轴心受压试验之前,采用通用有限元程序ANSYS,对LCFT短柱试件和LCFT长柱试件的轴心受压试验进行数值模拟计算。进行了LCFT短柱试件和LCFT长柱试件的轴心受压试验。轴心受压试验结果、本文叠加理论公式计算结果、有限元分析结果三者较吻合,验证了采用本文叠加理论公式计算LCFT的可行性。最后,提出了方钢管混凝土柱和L形截面方钢管混凝土组合异形柱(LCFT)若干有待进一步深入研究的课题,并对其发展形势进行了展望。更多还原

【Abstract】 Concrete-filled square steel tubular column has a better bearing capacity, earthquake resistance, fire resistance, and so on. So, concrete-filled square steel tubular column becomes the direction of multi-story steel-frame structures.For calculation method, the superposition theory, which is of simple calculation, of clear conception, of reliable safe, is verified to be suitable for the calculation of concrete-filled square steel tubular column, because of the supersonic flaw detecting and the theoretical analysis. Three problems, which are distributing coefficients of axial pressure, section turning radius, increase of bearing capacity, are point out, according to analysis for existing formula of superposition theory. Then, this paper introduces a new calculation method of superposition theory.Special-shaped column composed of concrete-filled square steel tubes is a new type of structural member. Flexible section is its distinct characteristic. L-shaped column composed of concrete-filled square steel tubes (LCFT) is an important part of special-shaped column composed of concrete-filled square steel tubes. Indoor area and space can be enlarged, and decoration can be convenient, while special-shaped columns were designed in buildings. So, special-shaped column composed of concrete-filled square steel tubes will be used widely, with country-wide popularization of the steel structural buildings.For LCFT, equivalent slenderness ratios are deduced, which is an important part of calculating in superposition theory. Buckling coefficient of steel tubes is defined according to existing data of axially compressed experiments for concrete-filled square steel tubular column.For LCFT, short column specimen and long column specimen are designed for axially compressed experiment in order to analysis load bearing capacity of strength failure, and of buckling failure.Before axially compressed experiments are carried on, short specimen and long specimen are simulated by general finite element programming, ANSYS. Results of ANSYS, superposition theory, and axially compressed experiments are concordant so that the feasibility of superposition theory for calculating LCFT isverified. At last, the author puts forward several problems for Concrete-filled square steel更多还原