计算公式：E=78.5*(a+b-2d)*2*d/10/1000 S=(a+b-2*d)*4/1000
箱型钢规格（mm）序号a234567300400400400700100120100250300400400b50060070080020010060100500500400600d242632382044424241626重 量 （kg/m）总重E283.3536386.9736520.4864670.5784270.0412.057610.801612.0576264.5136283.3536192.9216386.9736表面积（m/m）2S3.0083.7924.1444.4963.440.7680.6880.7682.8083.0083.0723.792
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