Hello, everybody

[侯建中]

Hello everyone, I'm a structural designer from China. As I have participated in many steel structure designs, not only in China but also in many foreign projects, I came across this place by chance while consulting design materials. There is no such forum for discussing structural design in China because few people in China are engaged in foreign steel structure design. So I can only explore bit by bit by myself. I have many questions to ask you all. Nice to meet you all. For instance, what software do you use for calculation when doing steel structure design? In China, PKPM and 3D3S are used, but steel structure design can only be carried out in accordance with Chinese design standards, which is quite limited. The wind load value of this software is the average wind speed within 10 minutes, but many national standards provide the maximum wind speed within 3 seconds. So, what is the conversion relationship between them?Looking forward to your reply

 

[ANE91]

There are a couple of ways to convert between wind regimes. The Durst curve is usually sufficient, but there are other models. You can find it in the Commentary of ASCE 7. It’s pretty straightforward to set up a spreadsheet with inputs for height, averaging time, and exposure.

 

[OffshoreWindStructures]

Hello.

we use STAAD , which has many national steel design codes. I think i have seen chinese codes on the list of STAAD options so that might be useful if you use different design standards.

Others can correct if I'm wrong but i think the american civil code uses the durst curve as mentioned above (from what i have read on it it's based on 1960s work but i couldnt find if it has been improved since then. ) previous discussion on durst curve: https://www.eng-tips.com/threads/wind-speed-comparisons.435230/

the offshore design codes like Norsok N-003, API-2A and ISO 19901-1 use the following relationship



while DNV C205 uses a slight variation on that



Eurocode also uses the 10 min mean wind speed rather than 3 second , the UK version of eurocode includes an exposure factor which incorporates the gust factor between the reference 10 min mean and peak gust wind speeds