Light steel villa decryption! Why light steel can resist wind level 12? -wellcamp light steel villa manufacturers
Light steel itself is light in weight, but it is strong enough to withstand a typhoon of magnitude 12 and an earthquake of magnitude 9, but such a large external force cannot destroy it. In fact, most of these are in line with the principles of mechanics. Today, I will reveal why light steel is so ignorant.“light and heavy”……Skin effect The skin effect is generally considered to mean that the surface layer covering materials (roof and wall panels) of the building make full use of their own stiffness and strength to strengthen the overall stiffness of the building. It is a ribbed thin shell structure produced by covering metal thin plates on the longitudinal and transverse ribs. The skin and the ribs work with each other. The skin itself has very large tensile, compressive and shear strengths in its plane, and because of the ribbed effect, the skin will not be unstable. The skin structure has a large load-bearing capacity and stiffness, and its own weight is very low. How the light steel structure reflects the skin effect The structural concept of the skin effect comes from the aircraft and ship industries. The skin effect of the light steel structure means that the skeleton is covered with a special structural plate (OSB plate, calcium silicate plate, etc.), A layer of skin is generated, and the actual mechanical effect produced is called the skin effect. Carry out the actual mechanical effect of the skin effect from three aspects: 1. In the specific case of only the skeleton; 2. In the specific case of adding diagonal braces inside the skeleton; 3. In the specific case of the skeleton and diagonal braces, choose OSB Plate development skinning Let's visualize it based on a model. Skinning effect model Skinning/skinning/effect/skinning refers to covering the skeleton with a special structural board (OSB board, calcium silicate board, etc.) to produce a layer of skin, and the actual mechanical effect produced is called skinning effect. According to the comparison of 3 different physical models, under the same conditions, different performances, experience the actual mechanical effect of the skin effect 1: The specific case of only the skeleton 2: The specific case of adding diagonal braces inside the skeleton 3: In the specific case of skeleton and diagonal braces, OSB board is used to carry out skin light steel structure house to make full use of the skin effect, so that after the frame with only light steel keel is covered with OSB board, the horizontal transmission of force is fully utilized , which increases the overall stress level and makes the house more firm and stable. The role of skin effect 1) The roof panel in the portal frame is used to resist the horizontal load from the gable wind-resistant column, transfer it to the cornice, and then transfer it to the foundation according to the wall skin effect or support. 2) In the gable wall of the portal rigid frame, after making full use of the shear skin effect of the wall panel, the gable wall frame can be designed as a bent frame without inter-column support (except when the opening area of the wall is too large). 3) Under the action of vertical gravity, the roof purlin will produce side bending and torsional deformation. According to the plate connected to the purlin, this deformation will be eliminated, and the panel skin effect will transmit its shear force to the connection between the purlin and the roof beam. Then, it is transmitted to each roof beam according to the purlin and the roof beam connector. 4) There is enough stiffness in the plate plane to produce lateral restraint on the upper flange of the purlin, which reduces the length of the purlin's stability calculation and further improves the stability and bearing capacity of the purlin. 5) The roof skin makes each plane rigid frame connect into an integrated space structure, reducing the lateral movement of the rigid frame. When the cornice is high and calculated by the side shift control structure of the column top, economic benefits can be produced. At this time, the vertical horizontal load can be completely resisted by the inter-column support; the setting of the purlin upper flange bracing system can be omitted, which brings as much economic benefits as possible; when the cornice is high and the design is controlled by the side movement of the rigid frame, it can be reduced The rigid frame is shifted sideways, thereby reducing the amount of steel used. Under the action of vertical load, the movement trend of the sloping roof portal frame is that the ridge is downward and the eaves are deformed outward. The roof panels will resist this deformation tendency in the form of deep beams together with the supporting purlins. At this time, the roof panel bears the shear force and acts as the web of the deep beam. The edge purlins bear the axial force and play the role of deep beam flanges.