Does the space frame structure use less steel than the truss?

When the plane shape of the space frame is an ellipse, the center of the ellipse is a high point. The slope cannot be arc-shaped. Similar to four-sided sloping roof, it may be necessary to be careful about the coordinate transformation of the slope and chord. Of course, the space frame ball joints at the gutter are not equal to the elevation (draining on two slopes in the direction of the short axis): 1. The gutter can be made of sections of equal height, 2. The short axis end point is very low and gradually rises along the periphery to the long axis end point, 3. The water baffle and the drain should be set at a certain distance in the gutter, otherwise the rainwater will easily accumulate at the end of the short axis, causing poor drainage or even overflow! If the space frame ball joints at the gutter are not equal in elevation, drainage can be done on two slopes in the direction of the short axis. 1. From a very low point on the short axis, gradually rising along the periphery to the long axis, 2. The gutter can be made into a cross section of equal height, 3. The water baffle and the drain should be set at a certain distance in the gutter, otherwise the rainwater will easily accumulate at the end of the short axis, causing poor drainage or even overflow! In this way, the height of the support of the space frame is not the same, the processing and installation are relatively troublesome, or it is better to level it. space space frame is a structural form suitable for large spans and at the same time relatively economical due to its two-way space force. However, there are many applications of tubular trusses and cold-formed truss purlins at present, is it necessary to save space space frames than plane trusses? The space space frame is not necessarily less expensive than the plane truss. What is not saving is that the space space frame has many structural members and bears a small force. In order to meet the slenderness ratio, larger members are used, so how to remove some Small structural rods are one of the keys to improving the amount of steel used in space space frames Space frames with relatively large length and width are mainly subjected to unidirectional force, and removing some length-direction rods can indeed save a lot of steel consumption. If the space frame with relatively small length and width is subjected to bidirectional force, it is not suitable for drawing rods. Optimizing the amount of steel used for the space frame structure In addition to the rods mentioned earlier, there is still a key point worthy of improvement, that is, the amount of steel used in the nodes is very large, reaching about 25%-30%. Reasonable design can also reduce the amount of steel used in the space frame structure. Some improvements are made to the currently commonly used joint forms. In this way, the amount of steel used in the space frame structure will be greatly reduced. All structured products have their scope of economic application. For buildings with general light roofs: The column spacing is 6-9 meters, and the C and Z-shaped purlins of cold-formed thin-walled steel are definitely more economical; 12-20 meters, flat truss purlin has advantages; More than 24 meters in both directions, the advantage of the space frame should be greater; but the disadvantage of the space frame is that it occupies more space and the ball joint uses a larger amount of steel. It is necessary to increase the primary and secondary purlins to fix the roof panel.