Short talking for the joint of semi-rigid frame III

　　I work for the same problem recently, and I choose the Chapter 11 of Taiwanese LSD Code to solve the yield problem. I can calculate the limitation of the flange or web for the H beam, and the formulas are just to control its allowable reaction force. Of course, the reaction force may be too large for the H beam, but I can choose the larger H beam for the engineering construction design. The ASTM A572 Gr.50 H beam, RH900x300x16x28, is selected, and the formulas 11.2-1 & 11.2-2 are also selected for the present situations. If you wanna know how to define N, you can see the Figure C11.2-1 where is located on the Taiwanese LSD Code. Besides, the parameter k is NOT tf, but you have to include the circular region which is k = tf + R. In my engineering case, I don't have to add the stiffening plates, so that I just provide the fundamental formulas. The steel material is not JIS or CNS standard, so that I don't have to reduce the yield stress Fyf for the flange whose thickness is less than 1.5in. Hence, I can check whether the size of H beam is enough or not, so that the yield problem has been solved.


　　

　　

　　
　　

Reference

1. 內政部營建署（2010）鋼結構極限設計法規範及解說，內政部營建署。

A Simple Case Study of Steel Structure

　　My company assigned me a frame case to set up a solar system on the roof of a factory, and I found a L.T.B problem of the steel structure which I wanna let you know the calculation details. The computer program STAAD.Pro 2007 is adopted, and I check the results by the hand calculation. When you use the computer program, you cannot discover what the problem is. This member is a simple beam with the Dead Load 24.75kgf/m and Wind Load 272.25kgf/m, and the section RH150x75x5x7 is selected. The steel material is CNS SM400, and its self-weight is 14.0kgf/m. In the general design methodology, the engineers always take Lp to control the member length, but sometimes they may not be able to use the same approach for every case. I show you a real case, and it shall be a good example for reference.


　　


　　

　　
　　








References

1. 內政部營建署（2010）鋼結構極限設計法規範及解說，內政部營建署。
2. 中華民國結構工程學會（2003）鋼結構設計手冊：極限設計法，科技圖書。