What is Aluminum circle curved lighting truss

When commercial domes use aluminum alloy curved roof trusses, the lighting effect can be optimized through the coordinated design of structure and materials, which can be achieved in the following four aspects:

1. Truss form and light-transmitting area layout

Adopt a hollow-type or truss beam combination structure, and set a light-transmitting belt between the chords. For example, the upper chord of the truss is designed as an arc-shaped aluminum alloy profile with a spacing of 1.2-1.5 meters, and laminated glass or polycarbonate panels are embedded in the middle to increase the light transmittance to 30%-40%. The dome of a shopping mall is formed by obliquely arranging the truss webs to form a diamond-shaped light-transmitting unit, which not only ensures the structural rigidity, but also evenly distributes natural light to the atrium.

Use the truss cantilever space to design side windows for lighting. For example, set high side windows at the truss support at the edge of the dome, and use reflective blinds to bring light deep into the room. A commercial complex has achieved an illumination of more than 200 lux at 20 meters from the dome in this way.

2. Integration of light-transmitting materials and truss nodes

Lightweight and translucent materials are used to reduce the truss load. For example, ETFE membrane materials and aluminum alloy truss nodes are connected by clamps. The membrane unit weight is only 0.15kg/㎡, and the light transmittance is 90%. A commercial dome is covered with 2,000㎡ ETFE membrane, which is combined with the curved guide rails of the truss chord to achieve the unity of membrane surface tension and structural force.

Light-guiding prisms are set at the nodes. Prism glass is embedded in the aluminum alloy pressure plate at the truss node to refract direct light into diffuse light and reduce glare. The dome of a department store has improved the illumination uniformity of the working surface from 0.4 to 0.7 through this design.

3. Reflection and diffusion system design

The lower chord of the truss is treated with mirror anodizing. After the aluminum alloy surface is oxidized to a high gloss level (glossiness ≥ 80GU), the incident light from the dome can be reflected into the room. A commercial center has increased the ground illumination by 15% through this measure.

Install diffuse shading devices. Hang perforated aluminum plates or fabric curtains between the truss webs to filter strong light in summer and enhance diffuse light in winter. For example, a dome uses a curved aluminum plate with a perforation rate of 30%. While the light transmittance remains at 25%, the UV transmittance is reduced by 60%.

4. Intelligent control system linkage

A light-sensing adjustment device is set up in combination with the truss structure. A light-sensitive sensor is embedded in the truss node to automatically adjust the transparency of the electrically controlled photochromic glass (such as PDLC film) in the light-transmitting area according to the outdoor light intensity. A shopping mall has reduced the energy consumption of artificial lighting by 40% during the day through this system.

Truss-supported photovoltaic-transmitting integrated components. Cadmium telluride thin-film photovoltaic panels and laminated glass are arranged at intervals on the upper chord of the truss, which can generate electricity and transmit light (transmittance 15%-25%). A commercial dome uses this technology to achieve an annual power generation of 120,000 kWh while ensuring basic lighting needs.

Through the above measures, the commercial dome can achieve a balance between lighting efficiency and energy consumption while ensuring the safety of the aluminum alloy curved truss structure, thereby improving the light environment quality of the indoor commercial space.

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