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最近我們設計了一个厂房,跨度为62公尺,柱間距为24公尺,有多支点悬掛式吊車。过去,这种厂房的主桁架有兩种做法:一种是用全鋼的,其缺点是耗鋼量大,鋼材如用St—52,一个桁架耗鋼量为48.6吨,若用CT—3,則需要60多吨;另一种做法是用予应力鋼筋混凝土的,这种做法省鋼很多,但其缺点是自重較大,一个桁架重达175吨,給結構安裝帶来困难。为了解决这个矛盾,我們試圖設計予应力混合鋼桁架。由于採光及吊車的要求,主桁架定型为平行弦桁架。又考虑到全鋼桁架上弦用鋼量占总重的34％,
Recently, we designed a workshop with a span of 62 meters and a column spacing of 24 meters. In the past, there were two main trusses for this kind of workshop: one is all-steel, the disadvantage is that it consumes a large amount of steel, the steel is St-52, the consumption of one truss is 48.6 tons, and if CT-3 , You need more than 60 tons; the other approach is to use prestressed reinforced concrete, this method saves a lot of steel, but its disadvantage is heavier weight, a truss weighing 175 tons, to the structural installation difficulties. In order to solve this contradiction, we tried to design the prestressed hybrid steel truss. Due to lighting and crane requirements, the main truss is shaped as a parallel chord truss. Taking into account all steel truss winding steel accounted for 34% of the total weight,