考虑多因素影响的U型渡槽结构性态及动力特性分析

发布时间：2018-08-14 15:53

【摘要】：渡槽是跨越河谷、洼地、道路等的空间薄壁输水建筑物,被广泛应用于农业灌溉工程和其他大型水利工程中,在缓解我国水资源时空分布不均这一问题上发挥着重要作用。实际运行期间渡槽结构往往会受到水体与槽体之间的耦合效应、环境温度、风荷载以及混凝土劣化等因素的影响,再加之早期修建的部分渡槽结构已不能满足现有设计标准的要求或已到了需加固、修补的关键时期,因此对多因素作用下的渡槽结构进行结构性态及动力响应分析有着深远意义。本文结合景电工程的地域特点及运行情况,采用数值仿真的方法,对多因素影响下渡槽结构的结构性态及动力特性变化规律进行了研究。主要研究内容如下:1)依据工程设计资料,建立渡槽结构三维有限元模型,对渡槽结构进行水荷载、风荷载、温度荷载及混凝土劣化等多因素影响下的结构性态分析,探寻不同因素作用对渡槽结构性态影响的敏感程度,为类似工程设计计算提供理论参考;2)依据附加质量法和流固耦合法原理,建立不同耦合形式的渡槽结构三维有限元动力模型,对其进行模态计算,并将模态计算结果与希尔伯特-黄变换法辨识结果对比,选出适合渡槽结构动力特性分析的高精度模型;再结合环境特点及混凝土劣化后的材料参数对其进行振动特性分析,研究温度荷载、风荷载及混凝土劣化对渡槽结构振动特性产生的影响;3)以截取的有限地基域为研究对象,建立黏弹性人工边界验证模型,采用施加等效荷载的地震动输入方法进行场地波地震响应分析,并将模拟结果与解析解结果对比,验证本文方法的正确性。依据上述研究成果对渡槽结构进行水荷载、风荷载、温度荷载及混凝土劣化等多因素影响下的地震响应分析,研究不同因素作用下渡槽结构动位移、动应力的分布规律,为该工程的后续加固或改造提供理论依据,同样也可为类似工程提供设计参考。
[Abstract]:Aqueduct is a thin-walled water conveyance structure across valleys, depressions, roads, etc. It is widely used in agricultural irrigation projects and other large-scale water conservancy projects. It plays an important role in alleviating the problem of uneven spatial and temporal distribution of water resources in China. The influence of environmental temperature, wind load and deterioration of concrete, together with the fact that some of the aqueduct structures built in the early stage can not meet the requirements of existing design standards or have reached the critical stage of strengthening and repairing, therefore, it is of great significance to analyze the structural behavior and dynamic response of aqueduct structures under multi-factors. The main contents are as follows: 1) According to the engineering design data, the three-dimensional finite element model of aqueduct structure is established, and the aqueduct structure is subjected to water load and wind load. The structural behavior analysis under the influence of temperature load and deterioration of concrete and other factors is carried out to explore the sensitivity of different factors to the structural behavior of aqueduct and provide theoretical reference for similar engineering design. 2) According to the principle of additional mass method and fluid-solid coupling method, the three-dimensional finite element dynamic model of aqueduct structure with different coupling forms is established. The high-precision model suitable for the analysis of the dynamic characteristics of aqueduct structure is selected by comparing the results of modal calculation with the results of Hilbert-Huang transform method. The vibration characteristics of aqueduct structure are analyzed by combining the environmental characteristics and the material parameters after concrete deterioration, and the temperature load, wind load and concrete deterioration pairs are studied. 3) Viscoelastic artificial boundary validation model is established for the study of finite foundation region, and seismic response analysis of site wave is carried out by using seismic input method with equivalent load. The validity of this method is verified by comparing simulation results with analytical solutions. The results of the aqueduct structure under water load, wind load, temperature load and deterioration of concrete and other factors under the influence of seismic response analysis, study the dynamic displacement of the aqueduct structure under different factors, dynamic stress distribution law, provide a theoretical basis for the subsequent reinforcement or transformation of the project, but also provide design reference for similar projects.
【学位授予单位】：华北水利水电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV672.3;TV312

【参考文献】