60度角钢的力学特性及其工程应用研究

发布时间：2018-04-21 16:41

本文选题：60度角钢 + 宽厚比限值　；参考：《南昌大学》2013年硕士论文

【摘要】：随着我国电力需求的不断增加,电网技术的持续进步,必然带来输电塔设计荷载的增加。但是,目前我国高压电输送均采用四边形电塔,电塔中所用角钢大部分都是两肢夹角为直角的普通热轧或冷弯等边角钢,已经不能满足由于电塔设计荷载增加带来的影响,严重制约了我国电力行业的发展。本文研究的60度角钢与传统的直角角钢相比,具有承载力高,整体稳定性强以及良好的经济性等特点。以60度角钢为构件制成的三角形断面电塔,相比于四边形电塔,具有约束应力和温度应力小、结构在三角形平面内部稳定、风阻小、节省材料和材料潜力能够充分发挥等极为重要的优点。因此,有必要对60度角钢的力学性质及其在三角形断面电塔中的工程应用进行研究。本文具体完成的工作如下：首先,以薄壁构件稳定理论为基础,进行60度角钢的轴心受压杆件的整体和局部稳定的理论分析,根据“等稳定”准则推导出适合于60度角钢的宽厚比限值的计算表达式。通过有限元数值仿真技术,对大量的单角钢构件进行屈曲分析,对提出的60度角钢的宽厚比限值表达式进行修正。其次,对满足宽厚比限值要求的60度角钢和直角角钢进行轴心受压和单面连接时的稳定承载力的研究,并与规范的计算结果进行比较,表明在相同用材的情况下,60度角钢具有更大的稳定承载力和整体稳定性。再次,将60度角钢作为构件应用到三角形输电线电塔中,通过理论分析、试验和有限元仿真,分析60度角钢三角形断面电塔的在不同荷载工况下的承载力和抗变形能力,表明三角形断面电塔具有更大的稳定承载能力和更好的经济效益。最后,对60度角钢的力学特性及其工程应用在今后进一步的研究工作提出了一些展望。
[Abstract]:With the increasing demand of power in China, the continuous progress of power grid technology will inevitably bring about the increase of the design load of the transmission tower. However, at present, the quadrangular electric towers are used in high voltage transmission in China, and most of the angle steel used in the tower is common hot rolling or cold bending equal angle angle steel with the angle of two limbs in the right angle, which has not been able to satisfy the installation of the electric tower. The influence of load increase seriously restricts the development of the electric power industry in China. The 60 degree angle steel studied in this paper has the characteristics of high bearing capacity, strong overall stability and good economy, compared with the traditional right angle angle steel. The triangular section electric tower made of 60 degree angle steel has restricted stress compared with the quadrangle electric tower. It is necessary to study the mechanical properties of the 60 degree angle steel and the engineering application of the 60 degree angle steel in the electric tower of the triangle section. The work done in this paper is as follows: first, the thin wall structure is completed. On the basis of the stability theory, the theoretical analysis of the integral and local stability of the axial compression bar of 60 degree angle steel is carried out. According to the "equal stability" criterion, the calculation expression of the width ratio limit suitable for the 60 degree angle steel is derived. By the finite element numerical simulation technology, the buckling analysis of a large number of single angle steel members is carried out, and the proposed 60 degree angle steel is put forward. Secondly, the study on the stable bearing capacity of the 60 degree angle steel and right angle angle steel which satisfies the width and thickness limit is carried out by the axial compression and the single side connection. Compared with the standard calculation results, it shows that the 60 degree angle steel has greater stability bearing capacity and overall stability under the same material condition. Thirdly, the 60 degree angle steel is applied to the triangular transmission wire tower. Through theoretical analysis, test and finite element simulation, the bearing capacity and the anti deformation ability of the triangular section electric tower under the different load conditions of the 60 degree angle steel are analyzed. It shows that the triangular section electric tower has a greater stability bearing capacity and better economic efficiency. Finally, the mechanical properties of 60 degree angle steel and its application in engineering are put forward in the future.

【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU391

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