The LED electronic display screen adopts floor-standing, wall-mounted or roof-mounted, all of which require calculation of permanent load, live load, wind load, snow load, ice-wrapped load, earthquake load and other load effects. Among them, the permanent load needs to be included in the screen's own weight load, and the live load needs to consider the maintenance load involved in the maintenance of the screen. The load combination factor should meet the requirements of the code.
The natural vibration period of wall-mounted or roof-mounted display screens should be combined with the main structure for overall analysis. Normally, the natural vibration period of the main structure can be used for calculation, and the influence of high vibration modes on the roof-mounted support structure should be analyzed (4). The calculation of wind load should be carried out in accordance with the design analysis of the enclosure structure, and the in-depth analysis of the large supporting structure should be carried out according to the specific structure form (5). The calculation of seismic load should comprehensively consider the effects of two-way horizontal earthquakes and vertical earthquakes. For wall-mounted support structures, particular attention should be paid to the analysis of the effects of vertical earthquakes under rare earthquakes.
Selezione dell'effetto del carico e della struttura del display a led
In addition, there is an electronic display unit inside the electronic display screen. Long-term lighting and other equipment operation will bring excessive heat, and heat dissipation problems are prone to occur inside. There are a large number of power lines arranged inside the support structure, and problems such as line aging will also occur. Easy to cause fire. The support structure of the display screen should have sufficient resistance in the event of such accidental effects so as not to cause continuous collapse and damage. It is necessary to strengthen the design of the supporting nodes of key components and improve the safety reserve.
Selezione dell'effetto del carico e della struttura del display a led
Structure selection
Floor support structure
The supporting structure of the floor-standing electronic display screen bears the load of the upper screen structure through the column connected with the foundation, which can be analyzed and calculated according to the cantilever beam structure. The floor-standing support structure usually adopts a single-column or double-column plus beam structure, and other types can be combined with the building model to choose a suitable support structure system. The column design can adopt concrete structure, steel tube structure and lattice steel column, and the cross beam can choose the steel structure type such as lattice beam. The selection of its foundation should be determined according to the geological conditions of the site, and calculations of compression resistance, pull resistance, bending resistance and overturning resistance should be carried out. Combined with the force characteristics of the cantilever structure, the key component of the floor-standing support structure is a vertical column design, and a safe and reasonable cross-sectional form that meets the process requirements is selected.
Wall-mounted support structure
The wall-mounted support structure is anchored to the side of the main structure through steel nodes. Usually frame columns can be used to fix the nodes. When the node spacing cannot meet the requirements, frame beams can be used as auxiliary fulcrum design positions. The beam members are fixed on the supporting points to form a horizontal sheet-like structure system, which bears the wind load from the display screen and serves as an overhaul channel to undertake overhaul loads. It is the main force-bearing system of the wall-mounted support structure. The screen keel is arranged on the horizontal sheet structure system. Generally, the system can use horizontally placed trusses. For systems with small node distances, section steel can be directly used as beams, and the calculation model can be a continuous beam scheme. The horizontal sheet structure system is the key component of the wall-mounted support structure.
Roof support structure
The roof support structure needs to be designed in conjunction with the original structure layout of the roof, and it is very important to optimize the roof support structure system to make full use of the original main structure system to bear the load. Generally, a variety of structural forms such as plane trusses, space trusses or grid structures can be combined with building modeling. The structural scheme is flexible and changeable, and finite element analysis software can be used for modeling, analysis and calculation. In view of the characteristics of the roof light steel, attention should be paid to the particularity of the natural vibration period and the whiplash effect. It is advisable to conduct a finite element analysis on the roof support structure and the building's overall model to study the stress and strain characteristics of the support structure.
The roof support structure belongs to the spatial structure system, and its connection with the main structure has many types, which need to be determined according to the actual situation on the top of the main structure. The force performance of different structure types is very different. Only by using the finite element method to analyze the force state of the overall space structure can a design scheme that meets the actual situation be obtained.
