How to achieve strong wind resistance of metal roof

In recent years, typhoons occurred frequently in our country, which brought huge loss to people's property, especially in coastal areas. The most frequent landings were in Guangdong coastal areas, accounting for about 1/3, followed by Taiwan, Hainan, Fujian and Zhejiang. In recent years, the vertical locking system popular in the upper cover part of long-span building structures has presented many problems in practical application, and the situation of being overturned is also common. Among them, the buildings of airport, station and exhibition center have large roof volume and wide space area, which belong to the buildings greatly affected by wind pressure. The roof of the Capital Airport collapsed three times, and the metal roofing system of the newly built high-speed railway station collapsed, triggering a nationwide safety inspection of metal roofing technology and strengthening measures.
Construction reasons:
The main performance in the aluminum bearing and steel purlin lack of tapping nails, tapping nails leakage or less play, resulting in the vertical locking support and purlin connection strength weakening; The roof plate locking strength is not enough to lead to the roof plate and aluminum alloy bearing bite strength is not enough. The first case is that the roof plate and support are removed at the same time, and the connecting tapping nails are broken; In the second case, the roof plate is removed and the support remains intact.
Design reasons:
It is mainly reflected in the small value of wind load during design, and extreme weather conditions are not taken into account, in which the roof is peeled off by wind.
Reasons for defects in connection mode:
In order to ensure the free sliding of the roof plate and the connecting support, the traditional vertical locking plate only relies on the semi-occlusal connection between the roof plate and the support on both sides, and the occlusal surface is relatively small. The roof plate is easy to deform under negative wind pressure, and when the roof plate deformation is too large, the roof plate is out of the support.
Metal plate pre-vertical edge molding, with hidden stainless fasteners pull plate rib groove fixed on the support structure, adjacent plate rib joint unidirectional 360 degree fixation, widely used in large span of public building roofing, structural connection, without colloid, waterproof effect and wind uncovered ability is the strongest.
How to achieve high wind resistance of metal roofing system, Hongxin Aluminum do so:
Upper double edge bite
The installation mode of 360-degree double vertical edge occlusion of metal roof has been applied in Europe for more than a hundred years. The application cases of Hongxin for nearly 20 years have not leaked water so far.
Lower hidden fastener fixed roof
By pulling the long groove in the middle of the plate ribs, the L-shaped stainless steel fasteners and the longitudinal metal roof plate can be synchronously displaced, not restricted by the expansion of the sliding fasteners, which can solve the plate stress caused by thermal expansion and cold contraction, meet the expansion and contraction of the longitudinal ultra-long roof plate, and completely change the metal roof expansion caused by the temperature difference of a large area of metal roof. It will not cause roof expansion, deformation and grinding due to plate stress.
Lock clamp
Using German technology, supporting special high strength aluminum alloy lock clip.
function
When the wind pressure is affected, the load receiving unit composed of the profiled steel plate and the screed steel plate can ensure that the roof plate is not affected by any.
Under the influence of negative wind pressure, the roof plate becomes the compression zone, and the stainless steel fixed fasteners installed in the groove of the roof plate become tension accessories.
Stainless steel fixed fastener fixed on the screed steel plate, its arrangement is not limited by spacing, according to the windward direction, floor height, wind pressure negative wind pressure area value for reasonable division, to ensure system safety.
The tensile and compressive zone of the profited steel plate is not only dependent on its own section, but also strengthened by the restraint of the plate.
Under the positive load, the roof supporting system is deformed as a whole, the slab becomes the compression zone, and the molded steel plate becomes the tension zone.
Under the action of negative wind pressure load, the search plate becomes the tension zone, the compression plate becomes the compression zone, and it is supported by strong constraints.
These details greatly improve the wind resistance of the metal roofing system.