摘要
混凝土拱坝由于具有特殊的超静定壳体结构,对温度尤其敏感,因此拱坝变形监控模型中的温度分量对模型综合性能有显著影响。使用常见的周期三角函数和平均温度等传统温度分量构建方法,无法很好地表示拱坝坝体内部的温度分布与外界温度的滞后效应。因此,提出了一种新的温度滞后特性模拟方法,采用Beta分布来描述滞后影响,并基于Beta函数建立了混凝土拱坝变形监控模型。将基于Beta函数的温度分量模型应用于某拱坝变形监控模型的建立,结果表明监控模型的拟合精度和预测精度均优于传统模型,并表征了前期气温对沿拱向坝体测点变形的影响权重分布,描述了气温对坝体变形的滞后效应。
Concrete arch dams are highly sensitive to temperature due to their unique hyperstatic shell structure.The temperature component significantly affects the overall performance of deformation moni⁃toring model.However,the traditional methods for constructing the temperature component such as peri⁃odical trigonometric function and average temperature cannot well represent the hysteresis effect be⁃tween the temperature distribution inside arch dam body and the outside temperature.Therefore,this study proposes a new simulation method for the hysteresis characteristic of temperature,using the Beta distribution to describe the hysteresis effect,and establishing a deformation monitoring model for the concrete arch dam based on the Beta function.The temperature component model based on the Beta function is applied to establish the deformation monitoring model for an arch dam,and the results show that the fitting accuracy and prediction accuracy of this monitoring model are better than traditional mod⁃els.This model characterizes the weight distribution of the influence of early temperature on the defor⁃mation of dam measurement points along the arch direction,and describes the hysteresis effect of tem⁃perature on dam deformation.
作者
胡恢武
杨威
彭嘉畅
巫殷旺
卢祥
HU Huiwu;YANG Wei;PENG Jiachang;WU Yinwang;LU Xiang(Xiangbiling Hydropower Station of SPIC Guizhou Jinyuan Weining Energy Co.,Ltd.)
出处
《大坝与安全》
2024年第3期35-40,56,共7页
Dam & Safety
基金
国家重点研发计划子课题(2018YFC0407103)。
关键词
混凝土拱坝
温度分量
BETA函数
变形监控模型
concrete arch dam
temperature component
Beta function
deformation monitoring model
