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针对钢混组合梁与混凝土梁的适用跨径有一定重叠、长期以来在梁体选取上难以得出较为准确判断的问题,以常用的混凝土箱梁为基础,采用波形钢腹板代替混凝土腹板,直钢板代替混凝土底板,以现行设计规范中的材料许用指标为上限,通过性能等代条件统计出材料用量指标,以估算单价指标得出等代条件下的结构经济性能初步对比结果。结果表明:采用波形钢腹板代替混凝土腹板在跨径为30m时经济性相同,跨径进一步增大时波形钢腹板优势逐渐突出;采用直钢板代替混凝土底板在跨径大于50 m时具备经济优势;进一步提高钢材型号将会缩小钢混组合梁与混凝土梁的经济性差距。
In view of the fact that the suitable span of steel-concrete composite beam and concrete beam overlap somewhat, it is difficult to judge accurately the selection of beam body for a long time. Based on the commonly used concrete box girder, the corrugated steel web instead of the concrete web , Straight steel instead of concrete floor, the current design specifications of the material allowable index as the upper limit, through the performance of the equivalent conditions statistics statistics of the amount of material to estimate the unit price index to come to the preliminary results of structural economy under the same conditions. The results show that the corrugated steel webs have the advantages of economical efficiency when the span of 30m is replaced by the corrugated steel webs, and the advantages of the corrugated steel webs are more prominent when the span is further increased. When the span is greater than 50m, Economic advantages; to further improve the steel model will narrow the economic gap between steel-concrete composite beams and concrete beams.