The flat-independent column LED display is very common in both street and road applications due to its simple shape and good visual effects. Wind load is the main load of various engineering, especially the design of independent column LED display structure. Because the flat LED display is non-closed structure, there are wind pressure on both sides of the advertising version, and it is very thin. Every time a typhoon strikes, the LED display is damaged or even collapsed. Sometimes the damage rate is even 90%. The losses caused by windstorms around the world are about 10 billion U.S. dollars per year, and there is an increasing trend. China is a country with severe wind disasters, and engineering damage is an important component of wind damage. Therefore, the scientific and reasonable determination of wind loads will directly affect the safety and economy of the design.
To create the ideal environment for your fish, proper and regulated light in the aquariums is of premier importance. Fish thrive under proper light but in relative moderation.This means that considerable thought and a modest investment will be required to keep your tank well lit, both for your pleasure as well as the fish.
The light in an average home is generally not enough for the fish living in an aquarium. Living all day and all night in that environment will not be conducive to the fish`s health or even their temperament. Like humans, fish thrive in a warm and pleasant atmosphere. Statistics definitely prove that fish living in a well lit aquarium certainly live longer and appear to be more energetic which must cause us to assume that they are happy.
Item Display
Package Include
1 X Free Hanging Kit
1X Free Power Cord
All the lamps have passed strict quality examination and are packed carefully before shipping.In order that our customers get high quality lamps,we attach importance to every details.
Application
1. coral reef lighting,fish tank lighting,coral reef tank lighting
2. aquarium lighting,aquarium art,aquarium shop,aquarim centre
3. fish bowl lighting,fish lighting,freshwater lighting,saltwater lighting
Company Info
Philizon Lighting is dedicated to provide high quality and durable lighting product for customer with very competitive price.Our products mainly foucs on LED Grow Lights and led Aquarium Light.The equipment and materials to produce hydroponics led Grow Light and Aquarium Underwater Lighting fixctures imported from Taiwan, Japan, Korea and Unites States, such as automatic SMT machine, reflowsoldering machine,all kinds of electric test equipment, large integrating sphere and such sorts of productionand R&D equipment.
Clients with Fair
Trade Terms
Payment: T/T, L/C, Paypal, 30% deposits before production, 70% balance to be paid before deliverying(Western Union are welcome)
Sample will be delivered within 7 working days.
Discounts are offered based on order quanlityes.
MOQ:sample order are acceptable
Delivery ways:DHL,UPS,FedEx,TNT, door to door,by sea,by air,etc.
We have over 6 years` experience in designing and manufacturing led aquarium lights,providing lamps of solid quality and getting high reputation from our clients from over 30 countries.All products are based on high-standard LEDs and comply with authoritative certification FCC, CE and ROHS..Our Aquarium Underwater Lighting have the professional spectrums and simulate the changes of sunlight in the whole day and the lunar cycle,creating the best light environment for reef, coral, Fish, etc.
Warmly welcom to take a visit on our factory at any time and we will pick you up at the airport or hotel in Shenzhen.
According to the damage of the LED display, the main reasons for the analysis of the LED display being blown and destroyed are:
First, the rear panel of the LED display screen is 1mm thick or less. Under the action of wind suction, the surrounding support becomes point support, the wind resistance is greatly reduced, and the rivet spacing is too large, causing the panel to break through the rivet or Together with the rivets, they are blown away by the wind.
Second, the wind load calculation is incorrect, resulting in a small wind load. The independent column flat LED display is a slender and thin structure. If the dynamic characteristics of the structure are not analyzed, the wind vibration coefficient will be taken as 1.0, resulting in a small design value of the wind load, so that the connection between the steel members and the components and the basic resistance Pulling ability is inevitably not enough. This is an important reason for the collapse of the independent column flat LED display.
When designing the LED display, we must ensure the reliability in the work, but also to minimize the weight of the LED display, which requires us to have an in-depth study on the strength, stiffness and stability of the independent column LED display. , systematic, scientific, and complete analytical research, constantly comparing and finding the most reasonable model.
Second, the mechanical analysis of the LED display screen The independent column flat LED display is composed of a column connected to the bottom surface and some rods on the side of the column. Because the LED display generally has a relatively high structure, it is prone to large deformation and vibration under the action of gravity load and wind load. In this paper, the calculation model is simplified as a cantilever beam fixed at one end, and based on this theory, the outdoor independent column LED display screen is analyzed and studied.
2.1 Load Analysis of LED Display Panel The load on the independent column flat LED display is: wind load, gravity load, ice load, snow load, earthquake action, temperature change, uneven foundation settlement, self-weight and various accidental accidents. Load and so on. The main load of the LED display is the wind load. Other loads are only considered under certain conditions. This paper only studies the characteristics of the LED display under wind load.
For engineering structural design calculations, the magnitude of wind action is best expressed directly by wind pressure. The greater the wind speed, the greater the wind pressure. Low-speed moving air can be viewed as an incompressible fluid and can be analyzed using the Bernoulli equation for stable motion of incompressible ideal fluid masses. When it moves on the same horizontal line, the Bernoulli equation is [1]:
(1)
In the formula (1): ωα is the static pressure per unit area; V is the volume of the air mass; v is the wind speed; m is the mass of the moving fluid mass; ωα·V is the static pressure energy;
Divide both sides of equation (1) by V, and the Bernoulli equation is:
(2)
At a pressure of 101.325 KPa, a normal temperature of 25 ° C and absolute drying, the gravitational acceleration on the sea surface is g = 9.8 m / s 2. The wind pressure per unit area obtained in the type (2) is:
(3) Since the wind pressure is related to the surface roughness and height in the boundary layer of the atmospheric pressure, it is also considered that the general buildings are all bluff bodies, that is, they are all non-streamlined bodies, which will separate, merge, etc. when the airflow bypasses the building. Phenomenon, causing uneven distribution of pressure on the surface of buildings. In order to reflect the influence of various factors and conditions on the average wind pressure on the building structure, and at the same time it can facilitate the application of LED display wind resistance design, China's "High-rise structural design specifications" and "Outdoor LED display facilities steel structure technical regulations" structure The standard value of wind load per unit area is defined as:
(4) In Equation 4, β is the wind vibration coefficient, generally 1.3, and u is the wind carrier type coefficient. Generally, for safety considerations in the calculation, take u=1.2; ω is the basic wind pressure in the area where the building is located ( KN/m 2). According to the requirements of a certain city, the LED display screen and building structure have the ability to resist 8 winds (maximum wind speed is 20.7m/s), and in the substitution type (3), ω = 263Pa is calculated. According to the formula (4), the wind pressure P = 1.0 × 1.3 × 1.2 × 263 = 410 Pa was calculated.
2.2 Analysis of the stability of the LED display The structure of the independent column LED display consists of two parts: the LED display panel and the column of the support panel. Since the architectural scheme of the LED display is fixed, the rigidity of the column is displayed on the LED. The stability of the screen is especially important. The traditional construction scheme is to adopt a concrete-filled steel tubular column structure. The outer diameter of the steel pipe is 1.8m and the inner diameter is 1.76m. The specific calculation formula of the bending stiffness is as follows:
(5) Es and E e are the elastic modulus of steel and concrete, respectively, E s=290000MPa, E e=28882MPa, and I s and I e are the moment of inertia of steel and concrete respectively. а is a coefficient less than 1, which reflects the influence of the characteristics of the concrete-filled concrete members on the flexural rigidity of the concrete-filled steel tube. For the concrete filled circular steel tube, а=0. 6.
The concrete part of the steel pipe is so that the bending stiffness of the concrete filled steel tube is:
Third, the structure optimization of LED display
3.1 Structural improvement of the column Due to the bending moment of the concrete filled steel tube, the concrete will be withdrawn due to the tension, resulting in a significant decrease in the bending stiffness. It is now considered to add steel bars in the concrete filled steel tube, and the concrete and the steel pipe have an interaction force when bending, thereby significantly increasing the bending rigidity of the column. When reinforcing steel bars for steel tube concrete, considering the small force near the neutral axis when the column is bent, it may be considered not to match the weight of the column as much as possible. The specific calculation formula of the bending stiffness is as follows:
(6) The diameter of the steel bar is 30mm, and the cross-sectional area steel bar adopts an approximate calculation formula for the moment of inertia of the x-axis of the centroid axis:
(xi is the distance from the steel bar to the mandrel)
Therefore, the flexural rigidity of reinforced concrete filled steel tube concrete is:
It can be seen from the calculation results that the bending stiffness stiffness of the column is improved by nearly 20%, and the effect can be seen in the actual engineering construction.
Figure 1 Concrete-filled steel tubular column section
3.2 LED display structure optimization
The basic structure of the LED display screen is an important part of the structure. It undertakes to safely transfer all the loads carried by the superstructure to the foundation and maintain the overall stability of the structure. In order to ensure the safety and overall stability of the LED display structure, the foundation is required to resist the pressure of the LED display itself and the pulling force caused by the bending moment.
The basic design of the LED display structure generally adopts the independent expansion foundation under the column. This structure requires a large amount of concrete and steel bars, and the economic performance is not good, and it is necessary to improve the basic form. Figure 2 is a simplified elevational view and plan view of the improved LED display. The base bottom surface is 10×4m, the bottom plate is 130cm thick, and the rib beams are 1400×400cm, 1600×400m and 1800×400m respectively. The most important feature of this foundation is the replacement of the conventional independent foundation vertebral concrete with a beam-slab structure, which reduces the amount of concrete used.
Check whether the bearing capacity of the foundation meets the requirements:
Where: G is the basic self-weight standard value; W is the base resistance moment; P max and P min are the maximum pressure value and minimum pressure value of the load effect standard combination base; the load N=1669.5KN, M=12857KN,
G=8960KN, A=140m 2. P max = 115.3 KPa and P min = 36.57 KPa were calculated based on the supplied data.
Since the bearing capacity characteristic value of the foundation is fa=131.43KPa and P max=115.3KPa<1.2fa=157.7KPa, the LED display foundation satisfies the requirements of foundation bearing capacity.
IV. Conclusions This paper mainly analyzes and optimizes the independent column LED display from the knowledge of structural mechanics. The main conclusions are:
(1) The load analysis of the independent column LED display screen is carried out, and the wind load is obtained. Through the stability analysis of the structure, the bending stiffness value of the column is calculated.
(3) Optimize the independent column LED display column and structural foundation. The optimized result is relatively reasonable. From the perspective of force and economic indicators, it has greater advantages than the conventional foundation. 
High Power Led Aquarium Lights,High Power Aquarium Lights,Led Aquarium Lights For Saltwater,Underwater Aquarium Light Led
Shenzhen Phlizon Technology Co.,Ltd. , https://www.szledaquariumlight.com