高薄拱坝安全评价探究

Research of Security Evaluation for High Arch Dam

针对高拱坝安全评价中对屈曲失稳考虑缺乏和评价标准经验性较强的情况,以拱梁分载理论和弹性稳定理论为基础,考虑高拱坝分层分段的拱圈和悬臂梁系统的协调作用,分别以均布荷载作用下的圆拱和自重及分布水平荷载作用下变截面悬臂梁为分析模型,建立了拱圈系统的屈曲临界应力总图和悬臂梁系统的联合作用公式。该公式统一了高拱坝安全评价的各种典型方法,建立了高拱坝安全评价的新标准,为拱坝优化设计建立安全控制条件提供参考。

According to the current situation that the evaluation of high arch dams'security faults to considering buckling instability and the evaluation standards depend on experience,an analytical model of high arch dam is established considering the synergism of arches on different height and cantilevers in different section.Based on the arch-cantilever method and elastic stability theory,the model includes the arches effected by distributing load and cantilevers effected by horizontal distributing allied weight loads.At last,critical stress diagram of arches and alliance effect formula of cantilevers are gained by this model.The result is:With the critical stress diagram of arch,we can analysis the strength and buckling stability by synthesis;with the alliance effect formula,we can afford a standard for the security evaluation of press-bending cantilever.So various typical method for high arch dam safety evaluation is unified and a new evaluation standard is raised.To addition,those can afford consultation for the bound function of arch dam's shape optimization.