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| 1 | 高拱坝超载破坏过程的第一主应力统计分析显示文摘利用ANSYS软件对某高拱坝超载过程进行超载数值计算,得到拱坝的超载破坏过程。先对超载过程单元第一主应力进行统计分析;再计算每次超载时每个单元第一主应力大小的变化率,统计单元第一主应力变化率在超载过程中的变化规律;最后结合数值计算及地质力学模型试验成果分析单元主应力变化规律所对应的承载力状态。研究发现:当结构达到极限承载力时,其第一主应力相对频数分布有较为明显的集中现象;在结构超载初期,单元第一主应力变化率较大的单元,在单元中所占百分率比例较高,单元第一主应力增长较快;随着荷载的逐渐增大,单元第一主应力增长变缓。当结构达到极限承载力时,单元第一主应力变化率较小的单元在单元中百分率所占比例较高。单元第一主应力变化率越分散,表明结构仍有较大的超载能力;变化率越集中,表明结构越接近超载极限。利用此规律可以较准确地确定高拱坝的极限承载力。 | 夏雨 吴泽 赵小莲 张仲卿 李靖 | 2015 | 应用力学学报2015，32，6： | 3 |
| 2 | 拱坝沿建基面抗滑稳定的体安全系数及其工程应用显示文摘对于坝基岩体发育有顺坡向结构面等复杂地质条件的拱坝,通常需要核算大坝沿建基面单滑面或多个平面组成的复合滑裂面的抗滑稳定性,但目前尚无为工程界公认的计算方法,现行拱坝设计规范也未作出明确规定。本文采用非线性有限元与传统的刚体极限平衡法相结合的分析方法,将滑裂面、坝基面、临空面与结构面相互切割、组合形成的潜在滑体作为研究对象,以坝基岩体内部发育的陡倾角结构面为分界面,将滑体离散为多个按串联或并联方式排列的块体,利用各块体的静力平衡条件与相邻块体间的变形协调条件,分析滑体在拱推力等外力作用下的抗滑稳定安全系数,即体安全系数。结合小湾拱坝工程,开展大坝沿坝基岩体发育的浅层卸荷裂隙抗滑稳定性的分析计算,通过实例分析表明本文方法的合理性与工程实用性。 | 孙平 汪小刚 王玉杰 段庆伟 | 2019 | 水利学报2019，50，7： | 2 |
| 3 | Reliability and variance-based sensitivity analysis of arch dams during construction and reservoir impoundment显示文摘The static performance of arch dams during construction and reservoir impoundment is assessed taking into account the effects of uncertainties presented in the model properties as well as the loading conditions.Dez arch dam is chosen as the case study;it is modeled along with its rock foundation using the finite element method considering the stage construction.Since previous studies concentrated on simplified models and approaches,comprehensive study of the arch dam model along with efficient and state-of-the-art uncertainty methods are incorporated in this investigation.The reliability method is performed to assess the safety level and the sensitivity analyses for identifying critical input factors and their interaction effects on the response of the dam.Global sensitivity analysis based on improved Latin hypercube sampling is employed in this study to indicate the influence of each random variable and their interaction on variance of the responses.Four levels of model advancement are considered for the dam foundation system:1)Monolithic dam without any joint founded on the homogeneous rock foundation,2)monolithic dam founded on the inhomogeneous foundation including soft rock layers,3)jointed dam including the peripheral and contraction joints founded on the homogeneous foundation,and 4)jointed dam founded on the inhomogeneous foundation.For each model,proper performance indices are defined through limit-state functions.In this manner,the effects of input parameters in each performance level of the dam are investigated.The outcome of this study is defining the importance of input factors in each stage and model based on the variance of the dam response.Moreover,the results of sampling are computed in order to assess the safety level of the dam in miscellaneous loading and modeling conditions. | M.Houshmand KHANEGHAHI M.ALEMBAGHERI N.SOLTANI | 2019 | Frontiers of Structural and Civil Engineering2019，13，3： | 1 |
| 4 | Risk-based probabilistic thermal-stress analysis of concrete arch dams显示文摘The probabilistic risk of arch dam failure under thermal loading is studied. The incorporated uncertainties, which are defined as random variables, are associated with the most affecting structural (material) properties o f concrete and thermal loading conditions. Karaj arch dam is selected as case study. The dam is numerically modeled along with its foundation in three-dimensional space;the temperature and thermal stress distribution is investigated during the operating phase. The deterministic thermal finite element analysis o f the dam is combined with the structural reliability methods in order to obtain thermal response predictions, and estimate the probability o f failure in the risk analysis context. The tensile overstressing failure mode is considered for the reliability analysis. The thermal loading includes ambient air and reservoir temperature variations. The effect o f solar radiation is considered by an increase in the ambient temperatures. Three reliability methods are employed: the first-order second-moment method, the first-order reliability method, and the Monte-Carlo simulation with Latin Hypercube sampling. The estimated failure probabilities are discussed and the sensitivity o f random variables is investigated. Although most of the studies in this line o f research are used only for academic purposes, the results of this investigation can be used for both academic and engineering purposes. | Narjes SOLTANI Mohammad ALEMBAGHERI Mohammad Houshmand KHANEGHAHI | 2019 | Frontiers of Structural and Civil Engineering2019，13，5： | 1 |
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