姜晓静,周星德,杨〓玲,李〓倩.基于位移的重力坝时变可靠性研究[J].水电能源科学,2018,36(10):98-100
基于位移的重力坝时变可靠性研究
Research on Time Variant Reliability of Gravity Dam Based on Displacement
  
DOI:
中文关键词:  重力坝  位移  可靠指标  混凝土老化  腐蚀
英文关键词:gravity dam  displacement  reliability index  aging of concrete  corrosion
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作者单位
姜晓静,周星德,杨〓玲,李〓倩 河海大学 土木与交通学院 江苏 南京 210098 
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中文摘要:
      以混凝土重力坝为例,在考虑混凝土老化及腐蚀的前提下,以位移减去许用位移作为功能函数,基于位移分布及变异系数保持不变这一假设,提出了一种基于位移的时变可靠性计算方法,即根据抗滑稳定功能函数、下游坝趾抗压功能函数、上游坝踵抗拉功能函数及位移测量结果来确定许用位移的均值和方差,通过已有混凝土老化及腐蚀的研究成果,拟合出混凝土弹性模量、腐蚀厚度随时间变化的表达式,进而以30年为基准,运用ANSYS软件对未来70年重力坝的可靠指标进行仿真,并根据仿真结果预测了达到服务期后的可继续使用年限,进而证明了方法的合理性和有效性。
英文摘要:
      In the paper, the concrete gravity dam (CGD) is utilized as the study object and aging and corrosion of concrete are concerned. Taking displacement minus allowable displacement as the function, an algorithm of time varied reliability was presented based on the assumption that the distribution mode of displacement and its variation coefficient remain unchanged. First, the mean and variance of allowable displacement were determined by the measuring displacements as well as relative performance indexes (anti sliding stability of dam basement, anti compressive level of dam toe and anti tensile level of dam heel) . Secondly, the expressions of concrete elastic modulus and corrosion thickness versus time were fitted by the corresponding test results. Thirdly, taking 30th year as the benchmark, the reliability indexes of dam in the next 70 years were simulated by software ANSYS. Finally, the service year of CGD was predicted by the proposed method. Thus, the rationality and validity of this method were proved.
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