Whether you walk through the streets of New York, Singapore, Frankfurt and Tokyo, or stroll the streets of Beijing, Shanghai, Shenzhen, Hong Kong, as long as you look up at the high-rise buildings soaring into the sky, you will find that almost all of them use architectural curtain walls.
Why? In addition to architectural functions and architectural art factors, the important functions of curtain wall are safety protection, energy saving, consumption reduction and cost saving.
What Is A Building Curtain Wall
Building curtain wall is different from infill wall, it has the following characteristics:
It is a complete structural system consisting of panels and supporting structures;
It can withstand large deformation in its own plane or have sufficient displacement capacity relative to the main structure;
It is an envelope structure that does not share the load and effect of the main structure.
Curtain walls are usually composed of panels (glass, aluminum panels, slate, ceramic panels, etc.) and supporting structures behind them (aluminum beams, columns, steel structures, glass ribs, etc.). This façade system is supported on, and usually encapsulates, the main structure. Due to the wide gap between the panels, the connection between the panel architecture and the beams and columns has mobility, so the curtain wall can withstand a large deformation of 1/100 in the plane.
If the curtain wall is connected with the main structure by bolts, rocker arms, and spring mechanisms, a large relative displacement can be generated between the two, and even when the main structure is laterally displaced by 1/60, the curtain wall will not be damaged.
Building Curtain Wall Is Required To Resist Temperature Changes
When the outside temperature changes, the structure shrinks and expands. If no measures are taken, the structure will be bent and crushed in summer; the structure will be cracked and broken in winter. Therefore, long pavements should be divided into joints, and long buildings should also be divided into several sections with temperature joints, thereby reducing the influence of temperature changes.
Long buildings can be divided into several sections with vertical temperature joints; however, tall buildings cannot be cut into several sections with horizontal joints, because the floors after horizontal joints cannot be hung.
Since it is impossible to solve the problem of temperature changes in high-rise buildings by sectional methods, there is only one way out: to enclose the entire structure with a building curtain wall, so that the structure is indoors, and the temperature does not change, so there will be no damage to the structure. , to ensure the safety of the main structure. This is one of the main reasons why high-rise buildings must adopt building curtain walls such as stick curtain wall.
The traditional brick wall and block wall are filled in the plane of beams and columns, and some beams and columns are exposed to the outdoor atmosphere and are directly affected by temperature changes. Therefore, the infill wall cannot solve the problem of temperature change, and it is difficult to apply in high buildings.
Building Curtain Wall Is Needed To Resist Earthquake Disasters
The Great Hanshin Earthquake in Japan in 1995 and the Chichi Earthquake in Taiwan in 1999, the epicenter intensity was above 11 degrees, the masonry infill walls and conventional glass windows were damaged in large quantities, and the curtain wall, even the glass curtain wall, rarely reported earthquake damage , Most of them are well preserved after the earthquake.
The curtain wall of the building has a wide seam and a special connection structure, so that it can withstand large displacement and large deformation of 1/100 to 1/60. Similar to the leaves relative to the branches and the curtain relative to the platform, no matter how the main structure shakes, the curtain wall can be safe and sound.
High-rise buildings soar into the sky and sway strongly during earthquakes. Only the curtain wall can ensure earthquake-resistant safety, and will not collapse and fall, preventing casualties.
How To Realize Energy Saving And Consumption Reduction Of Curtain Wall
As a large energy consumer, the energy saving of glass curtain wall is the top priority of the majority of curtain wall engineers and door and window people. So, in the general glass curtain wall project came up by curtain wall factory, how can we maximize energy saving? One is to choose new energy-saving glass materials; the second is to use low-emissivity glass and multi-functional coated glass; the third is to use thin-film heat reflective composite Material glass; Fourth, we must do a good job in the shading design of the glass.
The main measures to improve the thermal insulation and moisturizing performance of glass curtain wall at this stage are: glass mainly adopts glass processing technology such as Low-E glass, heat reflective glass, insulating glass, multi-screen insulating glass, etc. to reduce the direct radiation of the sun through the glass; profiles The class mainly uses high thermal resistance materials such as aluminum-plastic composite materials and heat-dissipating aluminum profiles.
Curtain Wall Saves The Cost Of Structure And Foundation
Building materials, such as steel and cement, are materials with high energy consumption and high cost. Saving materials means saving energy and resources.
The weight of the glass curtain wall is very light, which greatly reduces the material consumption of the main structure, reduces the load of the foundation, and saves the cost of the foundation. The construction of super high-rise buildings on weak foundations played an even more decisive role.
How To Treat The Problems Of Curtain Wall In High-Rise Buildings
Everything is divided into two, and the correct attitude is to maximize the advantages and eliminate the disadvantages. If a large area of the glass curtain wall is coated with glass, it may reflect sunlight to the surrounding buildings and streets, causing interference. At present, it has been stipulated that the glass reflectivity should be controlled below 30%, and the low-rise part can use aluminum plate, stone and glass curtain wall to reduce the interference of sunlight reflection. danger.