【作者】 申宇杰；

【导师】 郝际平；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2011， 硕士

【摘要】 目前,我国《钢结构设计规范》(GB50017-2003)对于采用平板柱脚的轴心受压柱,柱脚均当作理想铰接对待,未考虑柱脚对柱的转动约束作用。而理论分析和试验研究均表明平板柱脚具有相当可观的转动约束作用。为了研究平板柱脚对柱的转动约束作用,本文对采用平板柱脚的H型截面柱进行了试验研究。试验得到了柱脚弯矩-转角曲线,研究了底板厚度、锚栓数量以及长细比对转动刚度的影响,并分析了转动刚度对柱计算长度系数的影响;利用ANSYS软件建立平板柱脚有限元模型,对试验试件进行计算,并将计算结果与试验结果进行对比,验证了模型的准确性,在此基础上,系统分析了底板厚度、锚栓数量与直径、柱截面尺寸、长细比、混凝土强度等级以及钢材型号等因素对轴压柱平板柱脚转动刚度的影响。本文基于试验数据,对轴压柱平板柱脚转动刚度的计算公式提出了建议;推导得出了柱脚转动刚度与柱计算长度系数之间的关系。在对试验试件柱计算长度系数进行计算的基础上分析了底板厚度、柱截面尺寸、长细比以及混凝土弹性模量对计算长度系数的影响。更多还原

【Abstract】 At present, according to Code for design of steel structures(GB50017-2003),for axially loaded column with plated column base, the column bases are considered as hinged supports, without consideration of the rotational restraint to the column. But it has been proved that the plated column base possess remarkable rotational restraint according to the deduction of theory and experiments.To study the rotational restraint of plated column base to the column, H-section columns with plated column base were studied through experiment in this paper. The moment-rotation curves of the column base were obtained, the influence factors on the rotational stiffness of plated column base, such as the base plate thickness、the number of anchors、the slenderness ratio were studied and the influence to the effective length factor of rotational stiffness were also studied through the experiment; The paper established the plated column base models with the finite element software of ANSYS, analyzed the test specimen with the models and compared the finite element results with experimental results to verify the models being accurate. On this foundation, analyzed the influence factors on the rotational rigidity of the plated column base, such as base plate thickness, the number and diameter of the anchors, column section size, still grade and Concrete strength grade .The paper proposed the formulas of the rotational rigidity of the plated column base according to the experimental results, and deduced the relationship between the rotational rigidity of the plated column base and the effective length factor. The influence factors on the effective length factor such as the base plate thickness, the slenderness ratio, column section size and elastic modulus of concrete were studied based on the calculation of effective length factor of the specimen.更多还原