1. Overview of Glass Curtain Wall Architecture Glass curtain wall is a novel exterior wall decoration, which has the remarkable characteristics of concise and lively modern architecture. It rose in American high-rise buildings after World War II (mid-20th century) and was widely used all over the world. However, this form of external wall has many shortcomings, such as easy breakage, light pollution, poor thermal performance and high energy consumption, which have led to many problems and restricted its application at home and abroad in recent years. Glass curtain wall decoration was introduced into China in 1980s. Nowadays, modern buildings with glass curtain walls can be seen everywhere in large and medium-sized cities in China. However, the resulting light pollution is objective and easy to be ignored. Light pollution of glass curtain wall refers to the use of coated mirror glass and polished mirror metal plate in high-rise building curtain wall. When the sun shines directly on the surface, due to the specular reflection of glass and metal plate, it produces reflective glare, which has adverse effects on the surrounding environment. 2. Light Pollution Caused by Modern Glass Curtain Wall Building The glass curtain wall building built on the street is like a huge mirror, reflecting and interfering with street traffic. The reflected light will cause the driver's sudden temporary blindness and optical illusion, which will seriously affect the driver's visual judgment and easily lead to traffic accidents. Liaocheng Donge Jinhua Iron and Steel: The high-rise glass curtain wall building built near the residential area will cause reflection damage to the surrounding environment. Relevant research data show that glass curtain wall has the characteristics of focusing and reflecting light in the sun; Generally, the reflectivity of mirror glass is 82% ~ 92%, and the reflectivity of mirror stainless steel plate can reach 96%, which is more than 10 times of the reflectivity of original stone, ceramic tile and other external wall decoration materials. The reflected light beam is enough to destroy the photosensitive cells on the retina of human eyes, affect people's vision, make people feel uncomfortable, dizzy, and even cause blindness and other symptoms in a short time. Information from some large and medium-sized cities in China shows that road traffic accidents caused by "light pollution" are on the rise, and complaints about "light pollution" are also increasing. However, the reflected light of the mirror glass of the building is more intense than the sun, which greatly exceeds the range that the human body can bear. In summer, sunlight is reflected to the living room, and the harsh light is the easiest to destroy the original good atmosphere in the room, which also increases the average room temperature by about 5 degrees Celsius. People who work and live in a white, bright and polluted environment for a long time are prone to poor eyesight, dizziness, nausea, loss of appetite, depression and other similar neurasthenia symptoms, which will change people's normal physiology and psychology and induce some chronic diseases for a long time. Every year, the State Environmental Protection Administration receives complaints about light pollution in buildings all over the country, which has attracted the attention of relevant state departments, and relevant departments are considering formulating relevant laws and regulations to limit and reduce the occurrence of light pollution. The light pollution of glass curtain wall is produced under the following specific conditions:
Adopt (1) mirror glass and large-area mirror metal plate with high reflectivity;
(2) It is generated in a specific illumination direction (south, west and southwest) and at a specific time;
(3) The glass curtain wall adopts a certain arc shape, and the outer wall of the mirror surface is convex or concave, which constitutes the divergence or focusing of the reflected light;
(4) The degree of light pollution is closely related to the orientation, position and height of the glass curtain wall. 3. Case analysis of light pollution of glass curtain wall-light pollution of glass curtain wall of Huaneng Building Residents of a city sued Huaneng Building for light pollution. When the 22-story Huaneng Building was completed, its mirror glass curtain wall reflected light to the surrounding environment under the sunlight, causing light pollution. The plaintiff believes that the light reflected by the glass curtain wall and metal ball on the roof of Huaneng Building directly enters the house from the back window of the house where it lives. More than ten hours of reflected light a day leads to high indoor temperature, which affects normal daily life and aggravates the original disease. Therefore, Huaneng Building is required to eliminate light pollution immediately and compensate certain economic and spiritual losses. When the court heard the case, there was no conclusion because there was no basis to confirm whether the reflective phenomenon of the glass curtain wall and the top metal decorative ball of Huaneng Building reached the light pollution standard.
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