Papers by Author: Tong Chun Li

Abstract: The performance function tends to be implicit or nonlinear in the evaluation of gravity dam reliability, making it difficult to apply some classical methods, such as JC method, Monte-Carlo simulation etc., as they are supposed to be too time-consuming. One possible solution to this problem may be the introduction of artificial neural networks, among which RBF is featured with faster convergence, better precision and can realize global convergence to some extent. In this paper, the application of RBF in gravity dam reliability is investigated, with some examples presented to convince that its reasonable to put it into use.

Abstract: The cause of the concrete pier cracks of Lushui Puqi Hydraulic Hinge in China is studied by FEM (finite element method). The transient temperature field and thermal stress during thermal shock are simulated, and the sudden decrease of air temperature is concluded to be the main cause. Then the probabilities of crack propagation during thermal shocks are discussed in detail based on LEFM (linear elastic fracture mechanics), the results show that cracks will propagate during another thermal shock of 10°C or more decrease. Mode I Stress Intensity Factor KI is adopted to describe and evaluate the concrete crack characters. Further discussion is made on the influence of time, temperature decrease and crack depth.

Abstract: Considering the contacts between solid and fluid are subjected to dynamic lodes, the influence of vibration characteristic of structure which is coupled with solid and fluid are applied to calculation. In this paper, the calculation formula of structure vibration between solid mass and fluid is derived and the finite element method (FEM) is adopted for discrete of pump station structure and fluid, considering the effect of fluid flow to solid structure, the natural frequency of pump station is acquired. The result shows the method is correct and reasonable.

Abstract: This paper takes a sluice reconstruction project as an example. The constraint internal force, the related axis force, bending moment, and shearing force at the corresponding section are solved according to the unit stress and internal force balance. Furthermore, technology of mesh auto-generation in cross-section is utilized to plot the internal force graph of the structure directly, which will provide reference for reinforcement design and make it more convenient.

Abstract: Anti-sliding stability in deep foundation of Shatuo gravity dam is studied in this paper. Combined with the static and dynamic analysis of anti-sliding stability in deep foundation of gravity, strength reduction finite element method is used to do static calculation of anti-sliding stability firstly. The horizontal seismic strength can be gotten in order to be applied to the baseplane based on response spectrum method, thus dynamic calculation of anti-sliding stability can be carried out. The calculation result shows that static and dynamic anti-sliding stabilities in deep foundation of gravity meet the requirements.