拉压杆模型在桥墩墩帽中的分析与应用

Analysis and Application of Strut-and-Tie Model in Bridge Pier Cap

临猗黄河大桥主桥跨径布置为(112+28×128+120)m连续梁,上部结构采用钢混组合梁,主墩采用变截面空心薄壁墩,为减轻地震作用带来的不利影响,桥墩墩帽做掏空处理;针对临猗黄河大桥设计中采用的桥墩墩帽型式进行拉压杆模型和有限元实体进行对比受力分析,以确定桥墩墩帽构造型式和配筋数量。

The main bridge of Linyi Yellow River Bridge adopts the continuous beam with the span of(112+28×128+120)m,the superstructure adopts the steel concrete composite beam,and the main pier adopts the hollow thin-wall pier with variable section.The bridge pier cap is hollowed out to reduce the adverse seismic effects.In this paper,the strut-and-tie model and the finite element entity of the bridge pier cap were compared and analyzed to determine the tectonic type of the pier cap and the number of reinforcing bars.