小西湖黄河大桥剪力滞效应试验和理论研究对比

Experimental and Theoretical Study on Shear Lag Effect for Xiaoxihu Yellow River Bridge

兰州市小西湖黄河大桥采用矮塔斜拉桥方案,桥跨布置为81.2 m+136 m+81.2 m,单索面,主梁采用梯形截面单箱三室箱梁,是我国仅有的几座部分斜拉桥之一。针对大桥设计中部分斜拉桥箱梁的剪力滞效应及抗震性能等关键技术问题,采用主桥整体有机玻璃缩尺模型进行了剪力滞效应及动力特性的模型试验研究,并同时对该模型进行了理论对比研究。模型试验结果与有限元分析结果吻合较好,说明采用有限元方法能够较好地计算出部分斜拉桥的剪力滞效应和动力特性。因此,可以通过有限元分析计算出实桥的剪力滞效应和动力性能。

The project of Xiaoxihu Yellow River Bridge in Lanzhou was chosen as partial cable stayed bridge, whose span is 81.2m ＋ 136m ＋ 81.2m with single rank ropes. The height of the tower is 17m and the main beam was adopted as three cell single box whose beam was fixed to the tower and the piers were separated from the beam. In view of some key techniques such as shear lag effect and aseismatic performance during bridge design, organic glass scaled model is applied to have a experiment and a theory research at one time. The experiment result is basically same as the theory calculation, which indicated that shear lag effect and dy namical performance can be well calculated by FEA method. As a result, FEA method may be used to calcu late shear lag effect and dynamical performance of the real bridge model.