Span 3.6 meters, 3.7 meters long, with I-beam or channel steel as an interlayer, put wood on board, live, please ask what the use of large I-beam or channel, how much space?
1, if it is a concentrated load of P, then a No. 10 I-beam bears 450kg (5.7 meters in the middle can withstand 450kg weight). 2, if the load is covered with G, is a 10 157.7kg/m for I-beam (i.e. within 5.7 meters in length, the average can be covered with 157.7kg weight) you load 4 tons, which is now 4000kg, 10, N=4000 / 450=9 I need root (middle load).
First, calculate with a i-beam. W=49m check No. 10 steel fand section modulus and weight of unit length of g=11.25kg/m=0.1125kg/cm. Mechanical design provisions for ordinary I-beam, allowable stress of =1400kg/c square meters. That is, a single I-beam can withstand the bending moment M=49 * 1400=68600kg-cm, while the weight of the I-beam is m=4568.91kg-cm, so the single I-beam can only withstand the bending moment of M1=68600-4568.91=64031.1kg-cm.
Span 5 meters, in accordance with conventional steel 10# should be used, but must be GB, specific parameters can query metal products manual. After the material is made, it can be loaded with 150kg/m per metre
