自重施加方式对高拱坝廊道结构应力及配筋的影响

自重工况一般是高拱坝内廊道配筋设计的控制工况,由于高拱坝施工过程的特殊性及复杂性,有限元计算中自重有多种施加方式。结合工程实例,对高拱坝基础廊道结构进行三维有限元分析,比较不同自重施加方式对廊道结构应力及配筋的影响。研究结果表明:按整体自重考虑时,廊道结构应力及配筋面积明显偏小;全部按分缝自重考虑时,廊道结构应力及配筋面积明显大于按施工过程考虑自重的结果;为符合实际施工过程及结构承载规律,保证结构安全及经济合理,在拱坝结构的有限元计算中应按照施工过程考虑自重荷载。该研究成果对泄洪孔结构的应力分析也具有参考价值。

Influence of the Way of Applying Gravity on Stress and Reinforcement of Corridor in High Arch Dam

Gravity load case is generally the control condition of the reinforcement design of high arch dam.Because of the particularity and complexity of the construction process of high arch dam,there are several ways to apply gravity load,such as joint deadweight and whole deadweight.In this paper,the influence of gravity applying approach on corridor stress and reinforcement of high arch dam is studied through three-dimensional finite element analysis.Results show that in whole deadweight case,the stress and reinforcement area of the corridor structure are apparently small;while in joint deadweight case,the stress and reinforcement area of the corridor structure of are obviously larger than those of the deadweight results according to construction process.According to the actual construction process and the bearing capacity law of the structure,gravity load should be considered in the construction process in finite element calculation of arch dam to ensure structural safety and economic rationality.The research achievements could be taken as reference for the design of overflow outlet structure.