【作者】 贾冬；

【导师】 任旭华；

【作者基本信息】 河海大学 ， 水工结构工程， 2005， 硕士

【摘要】 工程界常采用等效静力法或建立在地基刚性基础上的简化动力法对水闸结构进行分析，这些方法对建在坝体上部的闸室结构是可行的，并能使工程计算得到合理的简化，但这些方法却无法考虑水、地基和结构动力的相互作用对上部结构应力和变形的影响。对于基础相对软弱的水闸结构，地基变形只能通过有限元法进行分析。 本论文结合国家重点水电工程锦屏二级水电站中遇到的实际问题，系统地研究了水闸结构的设计理论和空间水闸结构设计的现代计算方法：并对锦屏二级水电站首部拦河闸结构进行了有限元静动力计算分析。主要研究内容有： 1 研究了空间水闸结构计算的有限元法，将整个水闸和地基作为一个整体，进行静动力分析，并把空间应力转换为符合工程设计要求和习惯的平面内力，导出了相应的计算公式。 2．研究了反应谱法在空间水闸地震计算中的应用。 3．采用ANSYS结构分析软件，对锦屏二级水电站首部拦河闸工程结构和地基进行三维有限元静力分析和动力响应分析。静力分析采用弹性和理想弹塑性材料进行模拟，动力分析采用模态分析并结合动力反应谱法进行。分析计算结构及地基在竣工期、运行期和地震作用下变形和应力分布状况，求出了结构的自振特性和水平地震作用下的动力反应；并初步判断闸坝基础下覆盖层的动强度及液化的可能性，并对整个结构的安全和合理性进行了评价。更多还原

【Abstract】 Traditionally, the simplified quasi-static method is adopted to study the stress and strain induced by earthquake for sluice. However, this method can not take into consideration the effect of unevensettlement of the ground on its upper structure. A more satisfactory method is used to study by a model that can represent both the dynamic properties of ground and the upper structure. A simulation ansaly sis can be made on the preliminary design of a spillway and scouring sluice through three-dimensional finite element modal which has been consider strictly according to the structural and geological condition.Combined with the existing problems of the national key project- Jin ping Cascade 2 Hydroelectric Power Station, this paper systematically studied the theories of sluice structures; at the same time ,static and dynamic analysis of the sluice of Jin ping Cascade 2 Hydroelectric Power Station’ Sluice was studied using the Finite Element Method. The main studies were as follows.:1. The finite element method in spatial sluice calculation was researched. Regarding the whole sluice and foundation as an integral body, the static and dynamic analysis of the structure was made, and the spatial stress was transformed into plane stress according to demand and habits of the project design. At last the corresponding formulate was yielded.2. response spectrum method in spatial sluice calculation was researched.3. The structure of dam and foundation of Jin ping Cascade 2 Hydroelectric Power Station’ Sluice was analyzed in terms of 3-dimentional finite element static analysis and kinetic reaction analysis by ANSYS software. Static analysis was analogued by elasticity and ideally elastic-plasticity material,while kinetic analysis was carried out by the combination of modal analysis and kinetic reaction analysis hierarchical method. By analyzing and calculating the structure and stress distribution status of foundation under time of completion operating period and earthquake condition, and the structure self-oscillation character and dynamic response under the degree horizontal seismic were gained beside; the initial determination on the kinetic strength and liquefied possibility of underlying sand layer beneath the dam foundation are obtained.Then the security and rationality of the whole structure were comprehensively evaluated.更多还原