Three tons of electric gourd, the one track, the span of 10 meters, should choose how much steel, 20A will not be too small
First of all, the span of 10 meters is definitely smaller than that of 20A, which weighs 1.30 tons. You will have to choose at least 32b, and you will also have to increase the reinforcement and reinforcement of the side bends and downsides.
20A is no good, it requires a higher safety factor, and the steel bar is fixed, at least 40B
At least the i-steel of I45a, the span is too big. You can refer to the table from page 05g3559-3, but the maximum is only 9m.
