The Static And Dynamic Analysis On High Arch Dam With Attachment Structure System And Model Simulation

The static and dynamic analysis on high arch dam and attachment structuresystem need take the complex dam-attachment structure-foundation-water couplingaction into account, so there are still many problems need to be solved. So far themost difficult problems are dam heel stress issue, the dam and attachment structurevibration under the coupling action between dam and reservoir and the safetymonitoring of plunge pool slab. These problems involve complex coupling action, soit is not enough only to use theory analysis. In order to get reliable conclusion, it isnecessary to compare the result of theory analysis with the result of modelexperiment. From the integrality aspect, these problems are studied by theoryanalysis and water elastic model experiment. In this paper the calculation methodand some useful conclusion are presented. The characteristic of water elastic model is that it can satisfy hydraulicssimilarity principle and structural dynamics similarity principle simultaneously. Itcan reflect the complex coupling action between prototype structure and wateraccurately. The research on the water elastic model has been focused on thefollowing aspects: similarity principle, the proper simulation domain andmodification of experiment result. In theory, it can ensure the similarity betweenprototype and model, and modify the dissimilarity factor. This makes the waterelastic model become a powerful tool to solve the hydraulic structure static anddynamic problem. Because of the complexity of coupling action between foundation and dam, thedam heel problem has not been successfully solved up to now. Because of thecharacteristic of the elastic theory, the stress on dam heel is infinite, which makes thestress larger and larger with the increasing of finite element density. In view of thisthe dam heel stress trend determinant method is presented. This method uses theenvelope of stress curves to replace real stress curve. In order to verify the method,Xiaowan high arch dam model under the water pressure has been set up, while theFEA modal is set up at the same time. The result of model experiment is close to theresult form dam heel stress trend determinant method, which shows that the methodis correct. Using the method, Xiaowan high arch dam heel stress under all kinds ofloads can be determined, which can provide effective data for dam heel crackinganalysis. The dynamic analysis of arch dam need to take complex coupling action ofdam-foundation-water into account, so the dam is always simplified in formerresearch. The disadvantage of simplification is that it cannot be determined howmuch influence on natural frequency and dynamic response can be caused. In viewof this, Xiaowan high arch dam model is set up and dynamic response and someflow load are measured, and from which the whole flow load is gained thoughinverse analysis. Furthermore, Xiaowan FEA model is established based on thecoupling action of dam-foundation-water, and the dynamic response is gained bypositive analysis. Besides, the influence of attachment structure on natural frequencyand dynamic response is evaluated. At last all kinds of vibration source have beenanalyzed. With the increasing of dam flood discharge, the safety of plunge pool isbecoming more important. Up to now, the relevant theory about the flow load andslab buckling is not very mature, so it is significant to monitor the situation of slab.So a detailed calculation on slab monitoring were carried out, and in the calculationmodel 3 factors has been take into account: the joint action of steel under the uplift,the contact action between slab and foundation, and the fluid-structure couplingaction. The result shows that the fore-and-aft vibration curve is greatly different, so acreative new method are presented which make use of the change of all kinds ofeigenvalue of vibration curve to monitor the plunge pool slab safety...