Several Key Problems In The Dynamic Model Test Of Jin'anqiao RCC Gravity Dam

These years witness a continuous rise of crude-oil prices in the world. As renewable resource hydroelectric power plays more and more important role in energy supply, relaxing the bottleneck of resources that China encounters in the process of development. Northwestern and southwestern part of China within the range of meizoseismal area is rich in hydraulic water resource. China is constructing and planning many hydropower projects, fostering the development of the western region. These projects could provide electric power for coastal area of southeast and other profits. The aseismic capabilities of hydropower projects have close relationship with lives and properties of people and productions of industry and agriculture, so the earthquake becomes the main factor of projects design. Jin'anqiao hydropower station is in Lijiang region Yunnan province. Its water-holding structure is roller compacted concrete characterized by high acceleration of earthquake.This paper carries on the experiment with dynamic model test for the Jin'anqiao integrated dam, and acquires the dynamic response considering reservoir conditions, transverse joints and motivational directions. Works in this paper are mainly as follows.1. The materials, seismic input and sensor distribution of the model test are introduced. The scaling problems of model test are investigated. Main factors influencing model test results are damping, Poisson ratio, high-frequency modes, size of boundary, constraint conditions etc. Based on numerical analysis the paper adopts several correction coefficients, used in correcting the conversion of test results and response of crude model.2. The results of model test are instructed. Formulas of three-dimensional finite element method in elastic are deduced. The paper establishes three-dimensional finite element model for the integrated model using ANSYS software, considering reservoir conditions, transverse joints and motivational directions, and discusses its dynamic behavior in a complete perspective. The results of the experiments are in agreement with that of the finite element calculation.3. Seismic response of Jin'anqiao dam is investigated. Influence that made on frequency, modes, displacement and distribution of stress is considered. The conclusion this paper can be referred in design of hydropower engineering.