W桁架系统的发展

中文字数:3553,中文页数:10  英文字数:2478页数:10

摘要
作者提出了空间桁架系统的一个新的概念，在节点处使用了一个弧形板。这种节点有着比较稳定的性能，对于结构的一个重要部位来说它不会被焊接质量有效控制。这篇报告将通过对这种连接的一些试验性研究来阐述W桁架系统的发展。
引言
对于任何建设和施工中的钢管桁架结构，对于工程和钢管节点都需要做特殊的考虑因为此处的截面很密集。在空间桁架结构中钢管节点是有分支的，那就是说，钢管以一定的角度被连接起来，则钢管的角度、钢管的直径和钢管的壁厚都将大大影响整个节点的强度。在很多参数实验结果上得到的钢管节点的强度设计值，在钢管结构设计和施工11期中刊登出来，并且在实践中得到了广泛的应用。
另一方面，有一类包括各种不同球节点的被认为是结构次系统的桁架结构很好地利用了空间桁架结构的多样性。这种空间结构施工的有点包括有，第一，能够将三维结构在在节点处分割成许多构件单元，用同样的方法设计和生产许多的组合构件；第二，很好的再生性能和质量，这种杆件可以用于很多几何外形的结构，因为这种杆件的生产可以由机械完成并参数化控制。然而，如果是应用于普通几何形状那么这种机械化的节点生产就显得有些冗余和昂贵了。如果这种桁架系统被简单地应用而没有意识到它的特点，那么这种系统机制就只能是多余的，不能展示出其优越的效用。

Abstract
The authors propose a new concept of space truss system with using an arc plate
for its connection detail. The detail is aimed to have stable performance that would
not be controlled significantly by welders’ qualities, for an important part of the
structure. This report is focused on the development of the W-truss System through
some experimental studies of its connection.
1. Introduction
For any steel pipe truss construction in building & construction applications, special consideration is necessary for engineering and construction of steel pipe joints because the component members are closed sections. In a spatial truss construction where steel pipe joints are branched, that is, where steel pipes are joined at a solid angle of incidence, the incidence of angle, the pipe diameter and the pipe thickness work as parameters to influence on the over all strength of the joints. Design strength values of steel pipe branch joints, established on the results of many parametric experiment, are published in the steel pipe structural design and construction manual1)and have been widely used in practice.
On the other hand, there is a type of system truss structure comprising various spherical joints, known as a structural subsystem2) intended for utilizing the flexibility of space truss structures. The advantages of constructing a space structure by using it include, firstly, the capability of dividing a 3D structure into many component units at many nodes and designing and producing many unit members in
same ways. Secondly, an excellent reproducibility in performance and quality of such component members for any frame geometry because the component member production processes will naturally be mechanized and equipped with data processing capabilities. However, if applied to a frame of simple geometry, the joint structural
mechanism may have the disadvantages of being too redundant and expensive. If the truss system should be easily used in no awareness of its characteristics, the system mechanism will only be redundant, unable to exhibit its potent superiority.

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