The LED display support structure is divided into three types: floor type, wall type and roof type. The stress and strain characteristics of each type of support structure system are different. Through the finite element analysis and comparison of the three supporting structural systems, the optimization scheme of the corresponding supporting structure is obtained. The results show that the cantilever column of the floor-standing support system should adopt a circular section, the wall-mounted horizontal support system should adopt a combined truss, and the roof-top support structure should adopt a space truss system. Optimize the design of the key nodes of the support structure, and optimize the stress state of the joint by setting the shearing keys or the cruciform stiffeners to improve the safety performance of the support structure. With the development of multimedia technology, LED electronic display screens are widely used in commercial display, resulting in good advertising effects, and the design of excellent display support structure can also become a beautiful landscape in urban buildings. In combination with the line-of-sight requirements of the display screen and the investment area, structural type design is usually carried out according to the construction site and building requirements. LED displays are usually placed in a stand-alone floor or in an attached building (Figures 1, 2). For the support structure of different display forms, the corresponding structural form should be accurately analyzed. The paper will classify and summarize the support structure of LED electronic display, and propose the applicable scope, design difficulties and corresponding Optimize design and construction measures. Figure 1 landing display Figure 2 roof display 1, display support structure type 1.1 floor-standing support structure Floor-standing LED electronic displays are mostly located in city squares or important traffic intersections. It is known that the support structure of the landing display support structure should adopt the space steel truss structure. A set of four steel columns is combined to form a spatial lattice column. The upper screen body adopts a multi-layer horizontal space truss structure, which can meet the structural stress requirements and meet the maintenance channel settings. Yiwu Binwang Road LED display screen area screen effective size is 13.4mx8.6 m, belonging to the typical floor-standing support structure, using lattice columns to form a display support structure system. The four main limbs of the steel lattice column are 300 mm×300 mm×10 mm, the horizontal horizontal material is 200 mm×100 mm×6 mm, and the diagonal web is 100 mm×100 mm×6 mm. The internal space of the lattice column is used to repair the upper passage; the screen back The side members are made of steel truss structure, the upper chord, the lower chord and the web are 100 mmx100 mmx6 mm, and the upper part is laid with 6 mm thick steel plate to meet the requirements of the access passage. The foundation is based on a separate concrete foundation. The support structure is shown in Figure 3. 1.2 wall-mounted support structure The density of urban construction is relatively large, and only a few areas can meet the construction conditions of floor-standing displays. The LED electronic display has the advantages of playing dynamic screen advertisements, and a large number of LED displays are required in the bustling commercial areas of the city. The solution to this contradiction is to construct a display attached to the existing buildings. The LED display support structure attached to the building is generally divided into a wall-mounted display support structure and a roof-type display support structure according to the construction conditions, the transformation conditions, and the height of the building. The wall-mounted display support structure is mostly fixed on the side of the main structure by a single-layer steel structure, and an inspection passage is arranged inside. China Telecom Wenzhou Branch South Station Building LED large screen project display 24.0 mx 13.4m, is a typical wall-mounted display support structure, using square steel pipe 160 mmx160 mmx6 mm to form a node system, laying 6 mm thick embossed steel plate on channel 14a An access channel is formed, and each node is anchored to the column side of the main structural frame by 6 M16 anchor bolts. The façade and side elevations of the project are shown in Figure 4. 1.3 roof top support structure In actual use, the wall-mounted LED electronic display will affect the lighting of the building because it occupies a large building facade. Therefore, the wall-mounted electronic display is only suitable for large commercial buildings such as shopping malls. LED electronic displays with moderately constructed office buildings and residential buildings can only be designed on the top of buildings. At this time, the display support structure system should be classified as a roof display support structure. China Communication Service Guangxi Display Panel's display support structure is installed at the top of the building, making full use of the original main structure shear wall to set up the steel lattice system, and the beam and column are all using lattice members to form a space truss system with good stress state. The effective size of the display screen is 17.5 mx8.0 m, the main body of the steel lattice column is 100 mmx100 mmx5 mm, the horizontal horizontal material is 100 mmx100 mmx5 mm, and the oblique web is 60 mmx60 mmx5 mm. Horizontal horizontal and vertical The materials each constitute a truss system to resist lateral wind loads and seismic loads. The nodes are anchored to the main structure by 10 M12 bolts. The front elevation of the project is shown in Figure 5. 2, the load The LED electronic display adopts floor, wall or roof type calculations for permanent loads, live loads, wind loads, snow loads, ice loads, seismic loads and other loads (1). The permanent load shall be included in the screen's own weight load, and the live load shall take into account the maintenance load involved in the screen maintenance. The load combination factor should meet the specifications. The wall-mounted or roof-mounted display shall be analyzed in its own vibration period in combination with the main structure. Normally, the natural vibration period of the main structure may be used for calculation (2, 3), and the high-vibration type of roof-type supporting structure shall be analyzed. Impact (4). The calculation of wind load should be carried out according to the design of the enclosure structure. The large-scale support structure should be analyzed in depth according to the specific structure (5). The calculation of seismic loads should consider the effects of two-way horizontal earthquakes and vertical earthquakes. The wall-mounted supporting structures should pay more attention to the impact analysis of vertical earthquakes under rare earthquakes. In addition, an electronic display unit is arranged inside the electronic display screen, and long-time lighting and other equipment operations will bring too much heat, and internal heat dissipation problems are likely to occur, and a large number of power lines are arranged inside the support structure, and the line is aging. It is easy to cause a fire. The display support structure should have sufficient resistance when such accidental action occurs, so that continuous collapse failure does not occur, and the design of the support nodes of key components needs to be strengthened to improve the safety reserve. 3, structure selection 3.1 floor support structure The floor-standing electronic display support structure bears the load of the upper screen structure through the column connected to the foundation, and can be analyzed and calculated according to the cantilever beam structure. The floor-standing support structure usually adopts single-column or double-column and beam-type structure, and the other types can be combined with the architectural shape to select a suitable supporting structure system. The cylinder design can adopt concrete structure, steel pipe structure and lattice steel column, and the beam can be selected from steel structure such as lattice beam. The basic selection should be determined according to the geological conditions of the site, and should be calculated for compression, pullout, bending and anti-overturning. Combined with the force characteristics of the cantilever structure, the key components of the floor-standing support structure are the vertical column design, and the cross-section form that is safe and reasonable to meet the process requirements is selected. Combined with the construction period of the display support structure, the circular steel column and the lattice steel column section are selected for analysis to study the amount of steel under the same stress and strain conditions. The model was established by finite element analysis software. The circular steel column was colored 1000×15, the four main limbs of the lattice steel column were 300 mm×300 mm×10 mm, the horizontal horizontal material was 200 mm×100 mm×6 mm, and the oblique web was 100 m×100 mm×6 mm. According to the force characteristics of the cantilever structure, the load on the upper screen body is simplified to the top of the column, and the finite element analysis is performed on the two columns according to the simplified model. The analysis results show that the cylindrical section and the lattice section are all good cross-sections for the floor-standing support structure. Because the outdoor electronic display needs to repair the electronic display components, it is necessary to set up the upper passage. The latticed column can make full use of the lattice space to set the upper passage, and the cross section of the column will not appear like the circular section. Weak parts. When the circular section is required due to the landscape, the upper part should be partially reinforced. When both cross-section types meet the practical and aesthetic requirements, lattice columns should be preferred. 3.2 Wall-mounted support structure The wall-supporting structure is anchored to the side of the main structure by steel joints. The frame column can usually be used to fix the joint. When the joint spacing cannot meet the requirements, the frame beam can be used as the auxiliary fulcrum design position. The beam member is fixed on the support point to form a horizontal sheet-like structure system. The system bears the wind load transmitted from the display screen and assumes the maintenance load as the maintenance passage, and belongs to the main force system of the wall-mounted support structure. The screen keels are arranged on a horizontal sheet structure system. Generally, the system can adopt horizontally placed trusses. For systems with smaller node distances, steel can be directly used as a beam, and the calculation model can adopt a continuous beam scheme. The horizontal sheet structure system is a key component of the wall-mounted support structure. Figures 6 and 7 study the stress-strain characteristics of the two horizontal sheet-like structural systems. The main structure axis spacing is 7500 mm. The support point cannot be set in the middle of the inspection platform in the middle of the floor. Therefore, the maximum deformation point of the project occurs in the middle of the floor. According to the deformation characteristics, two structural forms are used for analysis. The joint members are all 160 mm×160 mm×6 mm, the single-section steel horizontal support structure is 100 mm×100 mm×5 mm, the combined truss horizontal support structure chord is 50 mm×50 mm×4 mm, and the diagonal web is 30 mm×30 mm×3 mm. According to the analysis results of Fig. 6, 7, when the total mass of the supporting structural system is the same, the truss structure with the inclined webs is smaller than that of the truss with the straight webs. The results show that the horizontal slab structure system can reduce the deformation of the supporting structure by using the truss truss structure. Especially when the frame axis spacing is large and the fulcrum cannot be continuously set in the middle area, increasing the density of the slanting web can effectively reduce the deformation of the supporting structure. 3.3 roof top support structure The roof-type supporting structure needs to be designed in combination with the original structural arrangement of the roof. It is very important to make full use of the original main structural system to bear the load to optimize the roof-type supporting structure system. Generally, a variety of structural forms such as a plane truss, a space truss or a grid structure can be combined with the building shape, and the structural scheme is flexible and variable, and the 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 carry out finite element analysis on the overall model of the roof-top supporting structure and the building to study the stress-strain characteristics of the supporting structure. The roof-type supporting structure belongs to the spatial structure system, and the connection mode with the main structure has various types, which needs to be determined according to the situation of the top of the actual main structure. Different structural types have great differences in force performance. Only when the finite element method is used to analyze the stress state of the overall spatial structure can the actual design be obtained. Figure 8 shows the grid structure formed by the shear wall and the lower column top supporting support point combined with the actual engineering main structure. The steel column and the transverse steel beam supported by the shear wall are 90 mmx90 mmx5 mm, and the transverse secondary steel beam is used. The combination double angle steel 2xL40 x4 is used, and the diagonal webs are made of double angle steel 2xL30 x3. The total mass of the steel is 13 900 kg, the root stress of the column member is 600, the value is 133 N/mm2, the stress of other components is not more than N/mm2, and the maximum deformation in the plane is 3.08 mm, which meets the deformation requirements (6). . Figure 9 uses a space truss structure system, the members are selected from square steel tubes, wherein the column and transverse steel beam support members are 100 mm × 100 mm x 5 mm, the secondary steel beams are 80 mm x 80 mm x 5 m, the diagonal webs are 60 mm x 60 mm x 4 mm, and the maximum stress is 135 N/mm 2 . The maximum deformation value is 3.08 mm and the total mass of the steel is 14100 kg. Comparing the two types of structures, it can be seen that the grid structure system with the same weight is similar to the stress and strain of the space truss structure system, and the two structural systems have similar effects. Considering the difficulty of construction and the convenience of maintenance, the roof-type supporting structure should adopt the space truss form. 4, node analysis There are a large number of connection nodes in the display support structure using steel members as the main components, and the accurate design of the nodes is critical to the safety performance of the overall structure. The support structure and the concrete foundation are connected by special pre-embedded parts, and the connection with the main concrete structure adopts 40c-study anchor bolts and planting bars, and the piercing bolts are preferably used in the connection with the beam body. Expansion bolts shall not be used on all nodes. The number of anchors set by the base node should meet the bearing capacity requirements and be arranged at equal intervals according to the principle of symmetry. The floor-standing supporting structure belongs to the cantilever type structural system, and the stress at the root of the column is large; the wall-mounted supporting structure also belongs to the cantilever type structural system, and the root root stress is large. Aiming at the stress distribution characteristics of the joints with the foundation and the main structure, the optimal design of the treatment of the nodes at the root can effectively improve the joint stress and reduce the amount of steel. Figure 10 shows the two root node types after optimization. 5, the conclusion (1) The floor-standing display support structure is a cantilever structure, and its column is a key component. According to the stress and strain analysis results combined with the electronic display inspection features, the lattice section is preferred. (2) Wall-mounted display support structure The horizontal sheet structure system adopts the inclined web joint truss structure better than the straight web joint truss structure. When the main structure axis is large, the density of the oblique web should be increased when the middle area cannot be set. (3) The roof-type display support structure can adopt the grid structure and the space truss structure system. The stress and strain of the two structural systems are balanced, and the space truss system is preferred in terms of construction difficulty. (4) The accurate design of the display support structure node is critical to the overall structural safety. The structural measures such as shear key or cross stiffener are set for the large force of the root of the node, which can effectively improve the bearing capacity of the node.
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