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The classification of C type steel is numerous, including: galvanized, hot galvanized cable tray, glass curtain wall, ranging in shape, edge line, car profile. Channel steel can be divided into light channel steel, ordinary channel steel, hot rolled channel steel, cold bend equilateral / unequal channel steel, cold bend inner / outer side channel steel channel.s
1.16 channel steel is feasible plan, but channel used to do horizontal keel, you can open a little distance, 1 meters, 2 to 1 meters, 6 can be, and then spacing 400 with L50 or L60 angle steel connection can be. Do you have wood or steel plates to see what you're going to do upstairs?. 20 I-beam is really not necessary.2., if you use I-beam, you can directly slotted in the wall, and then inserted into the wall after the fixed, you can also use expansion bolts fixed channel, after the wall and then overlap I-beam, full welding.s
2. in the middle of the 1/3 areas overlap, two joints center is not more than 1.3 times, lap length is 100% overlap, more than is 50% lap3. binding of tension or compression of steel bars less than 1.3 overlap length belongs to the same area, as long as more than 1.3 times overlap is not the same area. 500mm is used for mechanical connection of staggered, mechanical connections staggered not only to meet 500mm, but also greater than 35dThe 4. argument is not correct, for example, you know that your iron beam overlap region should be 1/3 in a cross street, under the iron bearing area is close to 1/3 (some four molecules bearing an atlas) in this region have staggered 50% joints (center to center more than 1.3 times the length of lap).s
1. determine the steel beam span, load point position and weight, make the bending moment diagram, and calculate the maximum bending moment M (MAX)2. general I-beam material is Q235, sigma (s) =2400KG/CM2, determine safety factor, generally take 1.7, [Sigma]=2400/1.7=1412KG/CM23.M (MAX) /]<=W (x), to meet the strength. W (x) refer to the mechanical design handbook for the bending modulus of i-beam.s
This should be based on the size of the room to design, need to use a large number of steel to do the main beam and auxiliary beam, these aspects are determined, according to the design plan to specific related budget. General family or villa do loft, price range of 600-1200 yuan, look at the process and room span.s