在温度荷载下钢结构输电塔架的受力特性分析

发布时间：2018-05-21 12:40

本文选题：大跨度钢结构 + 输电塔架　；参考：《中国民航大学》2014年硕士论文

【摘要】：均匀温度和日照产生的非均匀温度作用是对大跨度空间钢结构影响较大的作用之一,由于钢材的导热性能好,温度影响更加显著。本文根据现有的研究成果,将利用有限元软件分析大跨度空间钢结构输电塔架在均匀温度场及非均匀温度场下的受力及变形特性,为钢结构输电塔架的设计及施工提出依据,具体工作如下:(1)基于工程实体利用有限元软件建立大跨度多杆件钢结构塔架模型,梁柱连接处分为刚接和铰接两种形式,并选择合适参数。(2)依据温度作用的基本理论及工程所在地温度数据确定温度日变化曲线。根据温度日变化曲线把温差均匀划分5个梯度,分析结构在均匀温差下的变形及受力特性。(3)通过数据分析处理,引出相对伸缩量和安全因子两个概念分析结构的变形稳定性和强度安全特性。(4)建立瞬态热结构耦合分析整体模型,利用ASHARE晴空模型分析结构随时间变化的温度场分布规律,并改变影响温度场分布的参数进一步研究。(5)利用热分析得到的温度场作为温度荷载全部施加到各个节点中,进行计算得到结构的变形和应力,为施工和设计提供参考。
[Abstract]:The effect of uniform temperature and non-uniform temperature caused by sunlight is one of the most important effects on long-span spatial steel structure. Because of the good thermal conductivity of steel, the effect of temperature is more obvious. According to the existing research results, the finite element software will be used to analyze the stress and deformation characteristics of the transmission tower of large span spatial steel structure under uniform temperature field and non-uniform temperature field, which will provide the basis for the design and construction of steel transmission tower. The concrete work is as follows: (1) based on the finite element software of engineering entity, the tower model of large-span multi-bar steel structure is established. The Liang Zhu joint is divided into two forms: rigid connection and hinge connection. The diurnal variation curve of temperature is determined according to the basic theory of temperature action and the temperature data of engineering site. According to the diurnal variation curve of temperature, the temperature difference is evenly divided into five gradients, and the deformation and mechanical characteristics of the structure under uniform temperature difference are analyzed. Two concepts of relative extensibility and safety factor are introduced to analyze the deformation stability and strength and safety characteristics of the structure. The global model of transient thermal structure coupling analysis is established, and the temperature field distribution law of the structure varying with time is analyzed by using the ASHARE clear sky model. Further study on the parameters that affect the distribution of temperature field. 5) applying the temperature field obtained by thermal analysis to each node as a temperature load, the deformation and stress of the structure can be calculated, which provides a reference for construction and design.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM753

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