【作者】 郎婷；

【导师】 赵滇生；

【作者基本信息】 浙江工业大学 ， 结构工程， 2005， 硕士

【摘要】 钢桁架是应用广泛的一种结构形式,由于其形式多样、灵活,自重轻,因而特别适用于跨度或高度较大的结构。桁架压杆各节间的稳定相关性和节点刚度都对桁架受力性能具有明显的影响,但在以往的研究文献中都较少涉及,稳定相关性是由各节间杆件连续但轴力不同引起的,节点刚度则与支撑的设置和节点连接方式有关。本文从桁架上弦杆的稳定相关入手,同时考虑节点刚度的影响,以结构优化设计为目的,对桁架的受力性能进行了较全面的深入的研究、探讨。 首先,本文系统介绍了有关压杆稳定问题的经典理论和计算方法,分析了桁架结构的发展现状,受力特点及工程应用。其次,本文根据实际情况分四章由浅入深地对考虑相邻节间稳定相关性和节点刚度的压杆屈曲进行了论述:1、单跨压杆的屈曲,包括弯曲屈曲和弯扭屈曲;2、刚性支座下双轴对称截面连续压杆的弯曲屈曲;3、弹性支座下双轴对称截面连续压杆的弯曲屈曲;4、单轴对称截面连续压杆的弹性弯扭屈曲。其中在弯曲屈曲中都分别考虑了弹性屈曲和非弹性屈曲。 通过各种理论方法和有限元的计算,在对结果进行比较和分析后,得出了一些有用的结论,并推导了简化的实用计算公式和表格,便于在工程设计中应用。更多还原

【Abstract】 Steel truss is a widely used structural form. Because of the variety of its form and legerity, truss specially is applicable to long-span construction. There were little data on the buckling behaviors of truss compression chord with some panels and non-hinge joints before. Buckling correlativity is the effects of the truss compression chord one each other because of the different compression forces among panels. The bracing setting and connecting ways determine the joint rigidity. The buckling behaviors of truss compression chord are studied in the thesis.First, the classical theories about strut buckling and some background knowledge of truss are introduced, including development, mechanical behavior, engineering practice. Secondly, four chapters to study the problem of strut buckling are adopted, that is: 1. The buckling of single-span strut, including flexural buckling and flexural-torsional buckling; 2. The flexural buckling of continuous chord with rigid joint; 3. The flexural buckling of continuous chord with imperfection rigid joint; 4. The flexural-torsional buckling of continuous chord. Both instances of elastic and inelastic are considered in flexural buckling.On the analyzing the results from several theories method and finite element method, some useful conclusions are drawn and practical formulas and data tables are given, which can be easy used in the design of steel trusses.更多还原