为促进桥梁快速施工技术发展并减轻既有中小跨径混凝土桥梁病害,开展一种槽形钢梁-预制混凝土桥面板组合梁的设计研究.槽形钢梁中心间距3.2m,在梁端及跨内分别设置板式与桁架式横联,在钢梁上翼缘设置簇钉群作为剪力件.每块预制板的纵向长度取2.96 m,横向宽度可根据现场运输条件确定.该组合梁可采用无支架拼装施工,即先以钢主梁支承预制桥面板,并在形成组合结构后承受二期恒载与活载.对比现有的横向装配式预应力混凝土小箱梁,该装配式钢-混组合梁可降低梁高7％～10％,减少自重30％～37％,其所采用的预制单元划分策略和簇钉群连接技术有利于提高桥梁建设速度和质量.%To promote the accelerated bridge construction technique and to mitigate the common distresses in the existing short and medium span concrete bridges,a composite girder with the multiple steel tub girders and precast concrete deck slabs has been designed and developed.The center-to-center spacing between the steel tub girders is 3.2 m.At the ends and in the span ranges of the tub girders,the steel plate and steel truss transverse bracings are respectively arranged and on the upper flanges of the tub girders,the group clustered studs are arranged and are to be used as the shear connectors.The longitudinal length of each precast concrete deck slab is 2.96 m and the width of the slab can be determined according to the site shipment condition.The composite girder herewith can be assembled,using the unshored construction method,i.e.the steel tub girders are used to firstly carry the precast concrete deck slabs during the construction and then to carry the second phase dead load and live load after the composite structure is formed.Compared with the existing transversely assembled prestressed concrete box girders,the composite girder can reduce the girder depth by7％～10％ and the girder self weight by30％～37％.The strategy of the prefabricated element dividing and the technique of the clustered stud connection of the composite girder can greatly accelerate the bridge construction and improve the construction quality.
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