水域加热拉索线性膨胀系数测试研究

Test on Expansion Factor of Cable Element by Method of Heating Water

分析了预应力结构的发展历史和趋势,阐明了预应力索在现代预应力结构体系中的作用和地位,总结了预应力索的分类、性能及国内外对索的研究现状,提出了索的线性膨胀系数研究的重要性,并对利用拉索对结构施加预应力的主要方法(拉索法和支座位移法)进行了总结分析.利用研制的新型拉索线性膨胀系数测试装置——水域加热拉索线性膨胀系数测试仪器,对四种不同类型的拉索:3-9.3mm钢丝绳、工程用钢丝绳、钢绞线、半平行钢丝束,分10组对其线性膨胀系数进行了试验测定和分析,得出了四种拉索的线性膨胀系数,为科研、教学、设计及工程应用分析提供了依据.

The phylogeny and the tendency of the prestressed structures are analysed in this paper, and the function and status of prestressed cables are also immulated, the classification performance and state-of arts of prestressed cables are summarized and the importance of the research for linear expansion factor of the cables is proposed in this paper. And the main method （cable law and base displacement law） for imposing prestress on the structure by using cables have been summarized. Four different types of cables： 3-9.3mm wire rope and wire rope, spiral strand, parallel wire strand which are used in the engineering are divided into ten groups. And their linear expansion factor have been tested and analysed with the new type cable linear expansion factor testing device--testing equipment of expansion factor of cable element by method of water heating which has been manufactured in this paper. And the linear expansion factor of the four types cables have been gotten, so they can be the reference for the applications, analysis in scopes of research, teaching, design and engineering applications.