As shown in the figure, there are 4 steel pipes on the top floor and 50 steel pipes on the bottom floor, and the lower floor is more than the previous one 1.

So the total number of steel pipes is 4+5+6+…+50 = (50+4)+(49+5)+…+(23+31) = 23× 54+27 =1269.

So the answer is 1269.