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什么是钢结构中的网架结构?

发布时间:2017-08-30  来源:www.dlpcgjg.com  浏览次数:  分享到:

What are the grid structures in steel structures, what are the classifications and forms, and the associated construction and installation? Here is a detailed description for everyone.
A spatial structure formed by connecting a plurality of bars in a definite grid form. Has the advantages of space force, light weight, high stiffness, good seismic performance; can be used as a gymnasium, theater, exhibition hall, waiting hall, stadium awning, hangar, two-way LARGE-SPACE-COLUMN workshop building roof. The disadvantage is that the number of the rods to be delivered to the joint is large, and the manufacture and installation of the utility model is more complicated than the plane structure.
There are many kinds of space trusses, and they can be classified according to different standards.
grid structure
First, according to the structure of the grid itself, it can be divided into single layer grid structure and double layer grid structure, and the three layer grid structure. Among them, single-layer and three story grids are suitable for small span (no more than 30m) and large span (greater than 100m), and few domestic engineering applications.
Two, according to the construction materials include steel frame, aluminum frame, wooden frame, plastic frame, reinforced concrete frame and truss (such as truss steel truss and reinforced concrete plate interaction etc.), the steel grid in China has been widely used, combined network can also be used as a floor structure.
Three, according to the supporting situation can be divided into: peripheral support, four point support, multi-point support, three side support, the opposite side support and mixed support form.
Four, according to the composition of different ways, the space grid can be divided into four categories:
1. Cross truss system;
2, triangular cone system;
3 and four pyramid system grids;
4 and six pyramid system grids.
Among them, the fourth classification method is a popular classification method at home.
There are 11 kinds of grid structures which have been applied to different levels in our country. The following two aspects are introduced from the 11 aspects of structure and characteristics.
First, cross truss system
The first category is a grid structure consisting of two or three sets of plane trusses, called cross trusses. This is one of the simplest and also the earliest form of space grid structures. It develops and evolves on the basis of intersecting beams. This kind of frame upper and bottom chord length. The abdominal bar can generally be designed as a tie rod system, that is, long rod (diagonal rod) is pulled, and short rod (vertical rod) is compressed. The angle between the inclined rod and the chord member should be between 40 degrees and 60 degrees. The vertical bars are shared by plane trusses in each group. Such space grids are commonly used in 2 forms.
Among them, the cross truss system is divided into two space grids and three directional grids (Figure).
All kinds of space grids
Two, triangular cone system
The second categories are suitable for square, rectangular, triangular, trapezoidal, hexagonal, eight sided and circular shapes.
It is divided into three parts: the triangular cone grid, the evacuated triangular cone grid and the honeycomb triangle cone.
Three or four pyramid system
The third category is the grid structure composed of four vertebral corners, there are five forms, namely: four, Affirmative to Affirmative grid four grid, oblique four square pyramid space grid, checkerboard shaped four pyramid space grids and star shaped four pyramid space grids.
Four and six pyramid system grids
The fourth category is a grid structure consisting of six angles (seven faces), called the six pyramid system. Its basic unit is a 6 chord, and the six angles (inverted or upright) consisting of 6 strings. One of the main forms of this kind of grid is the six pyramid network.
The installation method of construction of grid structure is divided into two categories: one is the rise in the overall top ground assembly and integral elevating method and integral lifting method; the other is high in bulk, division on the assembling and assembling method of high slip in place.

 

什么是钢结构中的网架结构,有哪些分类和形式以及相关的施工安装?下面就为大家详细介绍一下。
由多根杆件按照一定的网格形式通过节点连结而成的空间结构。具有空间受力、重量轻、刚度大、抗震性能好等优点;可用作体育馆、 影剧院、展览厅、候车厅、体育场看台雨篷、飞机库、双向大柱距车间等建筑的屋盖。缺点是汇交于节点上的杆件数量较多,制作安装较平面结构复杂。
网架结构种类甚多,可按不同的标准对其进行分类。
网架结构
一、按网架本身的构造可分为:单层网架结构、双层网架结构;、三层网架。其中,单层网架和三层网架分别适用于跨度很小(不大于30m)和跨度特别大(大于100m)的情况,在国内的工程应用极少。
二、按建造材料分为:钢网架、铝网架、木网架、塑料网架、钢筋混凝土网架和组合网架(如钢网架与钢筋混凝土板共同作用的组合网架等),其中钢网架在我国得到了广泛的应用,组合网架还可以用作楼板层结构。
三、按支承情况可分为:周边支承、四点支承、多点支承、三边支承、对边支承以及混合支承形式。
四、按组成方式不同,又可将网架分为四大类:
1、交叉桁架体系网架;
2、三角锥体系网架;
3、四角锥体系网架;
4、六角锥体系网架。
其中第四种分类方法是目前国内较为流行的一种分类方法。
有11种形式的网架结构在我国得到不同程度的应用,下面从构成和特点两方面对这11种形式的网架加以介绍。
一、交叉桁架体系网架
第一大类是由两组或三组平面桁架组成的网架结构,称之为交叉桁架体系网架(如图)。这是一种最简单的,也是最早得到采用的网架结构形式之一。它是在交叉梁的基础上发展而来和演变而来。这类网架的上、下弦杆等长。腹杆一般可设计为“拉杆体系”,即长杆(斜杆)受拉,短杆(竖杆)受压,斜杆与弦杆夹角宜在40度到60度之间。其中,竖杆为各组平面桁架所共用。这类网架常用的有2种形式。
其中交叉桁架体系又分为:两向网架和三向网架(如图)。
各种网架
二、三角锥体系网架
第二大类适合于正方形、矩形、三角形、梯形、六边形、八边形和圆形等平面形状的建筑。
其中分为:三角锥网架、抽空三角锥网架、蜂窝形三角锥网架。
三、四角锥体系网架
第三大类是由四角椎体组成的网架结构,有五种形式,分别是:正方四角锥网架、正方抽空四角锥网架、斜放四角锥网架、棋盘形四角锥网架和星型形四角锥网架。
四、六角锥体系网架
第四大类是由六角锥体(七面体)组成的网架结构,称为六角锥体系网架。它的基本单位元为6根弦杆,6根弦杆构成的六角锥体(可倒置或正置)。这类网架的一种主要形式即为六角锥网架。
网架结构的施工安装方法分两类:一类是在地面拼装的整体顶升法、整体提升法和整体吊装法;另一类是高空就位的散装、分条分块就位组装和高空滑移就位组装等方法。