Aluminum stage truss with articulated or rigid connection? Which connection method is more stable? In response to this question, Shizhan Group says that both hinged and steel joints can be used to connect the linear bars of aluminum stage trusses, but which one is better?
Aluminum truss construction is usually not able to apply loads on linear bars. When loads are applied on the bars, assuming the nodes are hinged, the truss is only loaded with bending moments by means of simply supported beams, and the other bars do not participate in the loading. In this way, it is necessary to strengthen this bending member. If the nodes are rigidly connected, the rods will be bent as a whole by forming a rigid frame, and not only the rods themselves, but also the nodes will be subjected to large bending moments, which need to be strengthened.
A real aluminum truss structure is necessary to bear the applied load at the nodes, in order to ensure that the load is borne by the whole rod in pure compression or pure tension, while the nodes only transmit the linear force of the rod and bear the shear force without transmitting the bending moment. In this case, the linear bars can be hinged or rigidly connected to each other. In the case of no separation of forces, the truss does not require extra strengthening at the nodes of the truss.
Truss is a commonly used rod system structure. A truss is a rod system in which each rod is an edge of a geometric monomorph in the structure. For a plane truss, the monomorph is a triangle, and each rod is at least one edge of a triangle, and for a space truss, the monomorph is a tetrahedron, and each rod is at least one prong of a tetrahedron. So do you know why the nodes of Aluminum stage truss can be regarded as articulated? If each rod of Aluminum stage truss is considered as rigid body, the rod system they form will not be deformed and is very strong.
Structural mechanics needs to be simplified when analyzing the forces on each rod of the truss. It boils down to two: one is that all external forces act on the nodes of the truss; the other is that all nodes of the truss are hinged, which means that each rod can rotate freely around the nodes. The essence of these two articles is that each rod of Aluminum stage truss is subjected to tensile force only and not to bending moment, i.e. there is no bending.
One additional point to note is that the assumption that the loads act on the nodes is purely for the purpose of analyzing the forces without bending the rod. If there is a certain rod external load is added in the middle of the rod, it is easy to do, first distribute the load equivalently to the adjacent nodes to analyze the Aluminum stage truss, then just analyze this rod as a beam with the actual load and the reverse equivalent load, and superimpose the analysis results with the results obtained from the truss.
The above discussion on the bending of the Aluminum stage truss node hinge is purely from the order of magnitude, because the conditions set are unfavorable and the actual situation is much smaller than the bending stresses discussed. Therefore, it is usually safe to analyze trusses by considering only the tension or pressure on each rod.
Shizhan Group, a manufacturer of aluminum stage trusses, explains that the main components of aluminum stage trusses are as follows.
Firstly, the counter head of aluminum stage truss plays a very important role in stage construction, when we need to decorate the higher area, we need to use the counter head of aluminum truss. With the use of counter head, we can fix the truss better to finish the work of building the stage. Secondly, diagonal support.
When we need to use aluminum stage truss to decorate the high scenery, the staff needs to reach the high place. When building the stage, the best way for the staff to reach the high place is to use the inclined frame support, which can ensure the safety of the staff by fixing the whole truss.
The stretcher and hoist on the aluminum stage truss is a wheeled device, which is installed on the top of the aluminum truss. The main function of the stretcher and hoist is to facilitate the transfer of goods between the staffs on the top and bottom of the aluminum stage truss, which saves effort and provides convenience for everyone's work.
Aluminum stage truss is welded by hand in consideration of the actual situation of wind and rain in the process of erection. Then the lower chord webs are welded.
Shizhan group also mentioned that the webs between the upper and lower chords are then welded and the deflection and lateral deformation of the aluminum stage truss must be noticed at all times during the welding process and should be measured at all times, otherwise the welding sequence must be adjusted. The welding is done by hand welding with multiple layers and multiple passes to reduce the amount of heat application, and the welding is done from the middle of the aluminum stage truss to both ends to prevent excessive welding stress from causing too much deformation when the sections are disassembled.
Shizhan Group knows that many people have questions about how much the design of the stage truss frame determines the load-bearing capacity of the stage truss. Is it possible to modify the stage frame? This is a rather difficult question to explain.
Such as assembled stage truss, we often say that assembled stage truss is "fast to build, fast to put together" the application advantages. The reason to support this statement is that the frame of assembled stage truss is designed with tie rods, so when you use it, you can pull the stage truss frame apart and fasten it with clips. The W-shape design of the assembled stage truss is also the place that the sales of the stage truss factory are happy to talk about.
Because the W-shaped design makes the stage truss frame have nearly triangular structure, which enhances the load-bearing factor of the stage. The stage frame design is not so easy to change in the stage truss manufacturer. Even the concept of "stage support on demand" is only a "fine-tuning", the frame basically dare not move! In the eyes of some customers, this practice may be a kind of uninspired performance. But in the stage truss manufacturers this, but reflects the "responsible for customers" sense of responsibility. No matter what kind of stage, as a kind of activity equipment, are the high frequency of use of props, have to talk about "safety", safety is more important!
Therefore, the products produced by Shizhan, which are recognized by the market, are mature products. For example, the assembled stage truss, although its style rarely changes, it is difficult to win the hearts of some people, but for most people, it is applicable and good!