In actual steel structure engineering, why use H steel in large number, but seldom use I-beam? What's the difference between the two?
I-beam is a hot rolling molding, and its advantage is low price, easy processing, if made of steel column beam, two end welding plate will become. However, H steel needs to be welded with web plate and wing plate, and a great deal of welding and welding variant process have been added. I finished length (i.e. the length of 12 meters), and H steel for processing factory in accordance with the design drawings for the exact dimensions of cutting, welding and straightening type to complete multiple steps, so the steel price is low.Also has section size waste little, use design margin of I-beam, but instead of using H steel, low cost, cost saving. But there are too few examples of this kind of engineering, and this is not a common design idea.
I type is fixed, then the first, the "code" is not very full, for example: 32#c I-beam size is 320X134X13.5, then a large number is 36#a (360X136X10). The choice of small; second, his section height and width dimensions is that several, to meet the design conditions tend to produce waste, for example, sometimes Web condition is satisfied, the flange is not enough.
In actual steel structure engineering, a large number of H steel is adopted, but less I-beam is used, because the section of H steel is larger than that of I-beam, and the bearing capacity is higher and the cost is lower
