Super typhoon "Capricorn" roaring landing, the membrane structure of the sky to endure a severe test!

According to the National Meteorological Center, the 11th typhoon "Capricorn" appeared two eye wall replacements on the 5th and 6th of this year, and landed on the coast of Wenchang, Hainan Province on the afternoon of September 6, with a maximum wind of more than 17, which is the strongest typhoon to land in China after "Rammasun" in 2014. The main characteristics are stable path, rapid strengthening, long maintenance time, symmetrical and compact structure, and great destructive power. Affected by "Capricorn", severe wind and rain continued to occur in most parts of Hainan Province, and most parts of Hainan Province were affected to varying degrees, some infrastructure, industry and agriculture were damaged, and the production and life of the masses were affected.

Typhoon "Capricorn" near the center of the maximum wind reached more than 17, this strength of the wind is a great challenge to any building, blowing down trees, flying cars, broken glass, after the typhoon, everywhere in a mess. The attack of super typhoon "Capricorn" once again tested the infrastructure of Hainan region, extreme weather events put forward higher requirements for urban architecture, especially in Hainan Island, which is often faced with the threat of typhoons, the design and construction of membrane structure construction projects must take into account these natural challenges.

The First Affiliated Hospital of Hainan Medical College, built by Wanhao, Jiangdong New District of the corridor, aluminum panels and Windows around other building facilities were overturned in a large area, exposing the extreme weather conditions, but the lightweight PTFE film material, under the attack of the super typhoon, but little damage, its strong structural design and advanced construction technology played a key role.

Photos after construction

Photo taken after Typhoon Capricorn

In terms of structural design, the hospital corridor canopy fully considers the characteristics of Hainan Island's tropical climate, and it adopts an open canopy to ensure good air circulation and provide a comfortable medical environment. The awning is composed of light membrane structure and steel structure. The membrane structure is a typical wind-sensitive structure with light self-weight, small stiffness and low natural vibration frequency. Especially the membrane structure awning, which is an open membrane structure with large variation in shape, the dynamic effect of wind cannot be ignored. Stand a more severe test.

Photos after construction

Photo taken after Typhoon Capricorn

As a new building to replace the traditional glass ceiling, the membrane structure canopy has the advantages of lightweight, beautiful, fast construction, etc., and for the owner, the firmness and service life of the membrane structure canopy are more important, and the design link is very important to ensure the wind resistance of the membrane structure canopy.

(1) When the wind speed reaches a certain critical value, the self-excited vibration (flutter, etc.) caused by the increasing amplitude of the membrane structure canopy until the structure is destroyed should be considered in the design, and the limiting vibration (vortex-excited resonance, buffeting, etc.) caused by low wind speed should also be considered;

(2) In the design, the shape finding analysis should be used to make the film surface in a constant tension state to enhance the wind resistance of the film surface;

(3) In order to consider the dynamic effect of wind load, the wind vibration coefficient should also be considered when determining the wind load standard value;

(4) By applying pretension to the film surface during installation, the film surface is tensioned under the given geometric shape and boundary conditions, so as to obtain the ability to resist external loads.

The wind load of the canopy is closely related to its shape, and Wanhao designers give priority to smooth curved structures with low wind resistance and effective wind load reduction, while having strong wind resistance. Typhoon "Capricorn" confirmed the safety and reliability of the project's awning membrane structure. In general, the First Affiliated Hospital of Hainan Medical College Jiangdong New District is not only a masterpiece of architecture, but also shows excellent ability in coping with natural disasters.

From design to floor construction, there are many factors to consider in the perfect forming of membrane buildings, and difficulties and pain points will also change due to differences in geographical environment and building requirements. In the future, such super typhoons as "Capricorn" may also appear again, so the membrane buildings built in coastal cities should indeed treat the problem of wind protection seriously. Wanhao team will also continue to uphold the spirit of craftsmanship, provide more efficient and high-quality value services, with high requirements, high quality, high efficiency industry standards, to create a boutique project.