Summer and autumn are both typhoon season every year in China. Typhoon and storm attacks and consequences cost billions and millions. Constructions are shell of human’s survival. Wind and storm enhancement relies on building designs and shapes.
Best shapes of a building should be cylinder or prism. If the shape is a cubic, angle with 90 degrees should be reshaping into several acute angles. Outer shell should be smoothness and reduce bulging decorations.
Tall buildings have a low neutral vibration frequency due to its structure. If frequency is approaching wind frequency, the vibration frequency will increase. Many ways to change neutral vibration frequency, the most straight forward one is to enhance the structures and layouts on order to stabilize the frequency and make it remain comfort.
Shape coefficient of building should be small. Shape should reduce the square to wind in order to lower the negative effects. Rational design of a building shape reduce vortex and the increase of wind vibration. Even vortex happens, it may also reduce vibration.
Building groups should consider each shape within it. Each shape in this group has a certain effects in group sensing, funnelling and air flow. Buildings would also affect each other. More buildings in a specific area, more dangerous it will be to vehicle and pedestrians due to high density of building will increase the flow speed of wind in between building.
Typhoon cause millions of damage to aluminium windows such as glass breaking, frame crash due to high wind pressure on it. These may cause life dangers and lost in properties.
Construction wooden aluminium windows and doors had a long history around 3000 years started from ‘Shang’and ‘Zhou’dynasty. Modern aluminium windows and doors were developed in 20 century in China. In 1999, the import of thermal break technology, thermal break alloy windows and doors were becoming a brand new type of energy saving products in China after the usage of wood, ferrum, plastic and normal colored aluminium alloy windows and doors.
Quality windows and door last more than 20 years due to its valid standard wind withstanding design inside.
Wind-resistance means the physical abilities to against the pressure while closing and remain the same shape without any crashing and bending. It is one of three most important quality standard. National wind-withstand has 9 different levels. The high level, the better feature it will be. While choosing windows, customers should always choose high wind withstand level windows. In some other circumstances, it will be better to choose level above 5.
If aluminium window does not reach standard requirements, windows will be bend and crashed, glass will be broken.
Coast wind pressure (0.75kn/㎡ above ) choose P≥3.5Kpa wind-resistance aluminium windows.
Inland low wind pressure (0.30kn/㎡ above) choose P<1.5Kpa wind-resistance aluminium windows.
Inland normal wind pressure (0.50kn/㎡) choose P≈2.0Kpa wind-resistance aluminium windows.
Typhoon and storm area chooses water-tightness 350Pa/㎡ above aluminium windows.
Rainy area chooses water-tightness around 250Pa/㎡ aluminium windows.
Under shelters area chooses water-tightness below 150Pa/㎡ aluminium windows.
Air-tightness for normal buildings have 3 levels, high and public buildings have level 4. Windows air-tightness level for living buildings floors 1-6 should not be lower than ‘Graduations and test methods of air permeability, watertightness, wind load resistance performance for building external aluminium windows and doors’ level 3: Windows air-tightness level for public buildings floors 7 or higher should not be lower than ‘Graduations and test methods of air permeability, watertightness, wind load resistance performance for building external windows and doors’ level 4:
Quality aluminium windows and doors should be opened and closed smoothly, delicate designs, nice cutting, perfect angles and tightness.
Poor quality windows and doors may cause water and wind leaking, glass breaking and life dangers while standing strong wind pressure and forces.
Different windows have different designs, pros and cons and price, customers should choose the best for themselves upon their budgets.
Xingfa Aluminium, established in 1984, is the leading aluminium window supplier in China. Xingfa Aluminium has been persisting on the approaches of combining independent research&development and cooperation with domestic and overseas scientific research institutes. Relying on our own four national and five provincial R&D platforms, Xingfa always keeps close cooperation of industry, university and research to provide strong guarantee for the improvement of the company's technology research and development capability, thus forming self-owned core competence.