1. The scope of application of the current door code is that the height of the house is not more than 18m and the height-width ratio is less than 1, why does the code have this requirement? Does this requirement mean that the door rigid structure can only be made of such a large size?
Answer: the reason why the door code has requirements for the size of the structure is because the coefficient used in the calculation of wind load in China's door code is the value of the reference to the American code, and the ** of the American code coefficient is obtained by doing the wind tunnel test many years ago, when the sample data of the test is only in this range, so the conclusion is only applicable in this range, if the size exceeds this limit in the actual design, it is not that it cannot be done, but the wind load cannot be calculated with the current door code It needs to be discussed separately (or with a load code).
2. Why is the current door rigid code not applicable to the house with strong corrosive medium effect on the steel structure according to the current national standard "Code for Anti-corrosion Design of Industrial Buildings" GB50046? That is, why does the door code require that this code should not be used for buildings with strong corrosion resistance?
Answer: This is mainly because the plate cross-section of the beam and column components in the portal rigid frame structure is relatively thin, and the corrosive accumulation volatilizes over time, which will greatly weaken the effective size ratio of the component cross-section, resulting in unsafe hidden dangers.