LF-BJMB
Spatial Structure1

Spatial Structure1

Many applications require roofs or covers that are flat, or nearly flat. Spatial structure provide efficient solutions for these requirements. The most common Spatial Structure geometries are called "offset rectangular grids", "square on square spatial structures", or simply "square grids".
Spatial Structure1
But square grids have a couple of characteristics that may limit their use for the longest spans:

  • Loads must travel to the supports indirectly. Because the bars in the top and bottom chords of the frame are arranged in a square pattern, the load takes a stepped route to the supports, much like a taxicab downtown trying to go diagonally.
  • The depth is limited to less than the width of the module. Because the diagonal "web" bars connect neighboring nodes in the opposite layer, increasing the depth results in impossibly large nodes and heavy webs.

With the Geometrica system, it is possible to overcome each of these disadvantages, and thus use square grids for longer spans by modifying the conventional square grid as follows:
Increased chord density: In order to build a square grid that can transfer loads diagonally, we can take advantage of the Geometrica joint's capacity to resist bending moments. Square grids in each layer of chords can be reinforced with diagonal elements that are not directly connected to the webs. This stiffens the grid against twist, increases the density of the bending-resisting elements, and allows for longer spans.

Spatial Structure1
Varying depth: The top chord of spatial Structures may be sloped to provide a deeper section at the middle of the span as well as positive drainage.

Spatial Structure1
Double depth: The depth of the frame layer of webs and chords. The additional depth increases the second moment of area of the spatial structure, increasing the possible span substantially. Chords in the middle of the double depth frame may be removed because the Geometrica joint can resist bending. And because web members in the Geometrica system may be very light and slender, the increased web count does not result in significant additional weight.
Spatial Structure1
Camber: The "flat" spatial structure may be manufactured with a slight deformation in the direction contrary to the expected deflection under service loads. This eliminates any possible unsightly sag of the structure, particularly for the longer spans. Camber may be applied to either or both chord layers of a spatial structure.

Spatial Structure1
Another spatial structure geometry commonly used is the triangular grid. Because of their triangular pattern, these grids can resist in-plane twist. But as in square grids, their depth is limited and, for a large portion of their extent, they often contain more web members than are necessary to carry the load. In order to overcome these disadvantages, triangular grids may also benefit from the modifications available to square grids. See section on domes for some of the variations in triangular grids.
Related News
  • Sysco Productions deliver immersive audiovisual solutions for Brook-lands Museum

    Sysco Productions deliver immersive audiovisual solutions for Brook-lands Museum

    December 26, 2017World class experience delivery company, Sysco Productions, has delivered layers of audiovisual solutions as part of the £8 million Brook-lands Aircraft Factory and Racetrack Revival Project at Brook...view
  • Designing A Hangar

    Designing A Hangar

    November 21, 2017The first step in designing your aircraft hangar construction is to determine what will be the largest aircraft to be stored. In turn, this will dictate the size of the door opening. Next, determine...view
  • Global Steel Production Up 7% In January

    Global Steel Production Up 7% In January

    November 21, 2017Global production of raw steel totaled 136.5 million metric tons during January 2017, a 1.75% rise from the previous month's total and a 7.0% increase over the January 2016 total. The figures are base...view
  • Exploring Snow Sculpting In Jilin

    Exploring Snow Sculpting In Jilin

    November 21, 2017Snow sculptures at Jingyuetan in Changchun, Jilin province, an experiential snow sculpture park and the venue for an international skiing festival called Vasaloppet, have been taking shape.During the ...view
  • Beijing And Oslo Will Seek Free Trade Agreement

    Beijing And Oslo Will Seek Free Trade Agreement

    November 20, 2017China and Norway agreed on Monday to normalize bilateral ties, which deteriorated six years ago, with Oslo vowing not to support acts that hamper China's core interests.Premier Li Keqiang and Norwegia...view
  • Uses of Domes Roofs

    Uses of Domes Roofs

    November 23, 2017It is believed that there are more than 300,000 domes roof around the world today. They can be constructed in a variety of sizes, with the largest being 216m in diameter (the Fukuoka Dome, a baseball...view
  • TEL:+86 516 8595 0258
  • FAX:+86 516 8595 0278
  • EMAIL:marketing01@cnxzlf.com
  • ADDRESS:222, Block B, Diamond International, Guozhuang Road, Xuzhou, Jiangsu, China