替换空心板的变高度后张预应力T梁设计研究

结合某空心板梁桥的单板受力病害,提出采用一种变高度后张预应力T梁替换空心板的处置设计方案。该结构方案的梁端与原空心板梁高度相等,跨中梁高适当增加,这样可以在不改变原桥面标高的前提下更新桥跨结构。为此,在截面构造上加密了T梁的肋间距(比一般横向装配式T梁的肋间距小),优化了预应力筋布置,并在T梁端部设计了"预埋钢板"和"抗剪钢筋骨架"两种抗剪加强构造,可为同类工程的改造设计提供参考。

Design of post-tensioned prestressed T-beams with variable height replacing hollow plates

Based on the stress failure of a hollow slab bridge, a design scheme of replacing the hollow slab with a post-tensioned prestressed T-beam with variable height is proposed. The beam end of the structure scheme is equal to the height of the original hollow plate beam, and the height of the middle span beam is increased appropriately, so that the bridge span structure can be renewed without changing the elevation of the original bridge floor. For this reason, the rib spacing of T beam is sealed in the section structure (smaller than that of general transverse assembly T beam), the prestress reinforcement is optimized, and two shear reinforcement structures "embedded steel plate" and "shear reinforcement skeleton" are designed at the end of T beam, which can provide reference for the renovation design of similar projects.