Research On Seismic Performance Design Of Arch Dams And Influencing Factors For Model Tests

With implementing of the West Grand Development Strategy, one batch of high arch dams is being built or will be constructed in southwest China. The reservoir capacities of these projects reach several billion cubic meters, and most of these projects were built in strong earthquake region. Once the dam faild, it would bring serious consequence. In order to study the dynamic destruction mechanism of concrete arch dam in earthquake, FEM-based numerical calculations are adopted to research the possible failure modes, considering the nonlinear factors such as cracks of concrete and opening of transverse joints. The results offer important reference to engineering designers and anti-seismic design. The major works are summarized as follows:It briefly introduces the primary theories refered in this paper: the theoretic frame of concrete element, the primary theory of contact algorithm in FEM. The contact algorithm is just mainly about Lagrange multiplier method.Adopting nonlinear time history analysis, the relationship of downstream displacement at arch crown and the peak ground acceleration (PGA/GPA) is studied. The relationship can be categorized in 3 levels, which can demonstrate the holistic destruction state of arch dam, also is useful to estimate the holistic anti-seismic performance of dam. Based on the above discovery, considering situation of under design earthquake and different levels probability earthquakes, anti-seismic performance design is done.It researches application scope of nonlinear pseudo-static method, founding that it is feasible to gravity dam but not to arch dam due to its high statically indeterminate characteristic. At last, it discusses the contributions of different modes to dam's damage.It discusses falure model test under nonlinear situation. It deduces various similarity ratios between prototype and model dam according to similarity principle, and then, just taking account of the case of brittle damage, constructs numerical model of model dam and leads the result. According to comparison between model numerical result and original numerical result, it demonstrates the correctness and effectiveness of failure model test. Later, it computes numerical result of model dam using extended earthquake wave. It founds that its damage is more serious than original dam. Author gives the possible resons and reminds that we can not ignore the impact of the extended earthquake wave to failure model test. At last, drawing the conclusion and works of this paper, the expectation of advanced research is put forward...