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通过理论推导,确定了简支梁绝对最大弯矩与跨中截面最大弯矩差值的上限,从而对实际设计工作提出有益的建议“,”Through theoretical deduition is determined a big difference between the absolute maximum moment of a simply supported beam and the maximum moment of the middle span section. Hence a helpful suggestion for the practical engineering design is put forward.