This study aims to analyze seismic damage of reinforced outlet piers of arch dams by the nonlinear finite element （FE） sub-model method. First, the dam-foundation system is modeled and analyzed, in which the effects...This study aims to analyze seismic damage of reinforced outlet piers of arch dams by the nonlinear finite element （FE） sub-model method. First, the dam-foundation system is modeled and analyzed, in which the effects of infinite foundation, contraction joints, and nonlinear concrete are taken into account. The detailed structures of the outlet pier are then simulated with a refined FE model in the sub-model analysis. In this way the damage mechanism of the plain （unreinforced） outlet pier is analyzed, and the effects of two reinforcement measures （i.e., post-tensioned anchor cables and reinforcing bar） on the dynamic damage to the outlet pier are investigated comprehensively. Results show that the plain pier is damaged severely by strong earthquakes while implementation of post-tensioned anchor cables strengthens the pier effectively. In addition, radiation damping strongly alleviates seismic damage to the piers.展开更多
Based on the use of finite element method(FEM) software ANSYS in electromagnetism, the electromagnetic processing of single winding 2D transformer and double winding 3D transformer are analyzed fully. Two examples, wh...Based on the use of finite element method(FEM) software ANSYS in electromagnetism, the electromagnetic processing of single winding 2D transformer and double winding 3D transformer are analyzed fully. Two examples, which are 2D static field and constant magnetic field, illustrate that the symbolization color vector pictures and curves obtained by ANSYS are not to achieve with other FEM softwares developed by individuals. For a transformer, the forces born by each winding pie and even each turn are analyzed separately under the conditions of unloading, normal load and short circuit. Especially under the condition of short circuit, there are pushing, pressing, suspending and vibrating between winding turns, and then the total winding is probably damaged. Therefore, the detail results give a basis to further fault diagnosis.展开更多
基金National Natural Science Foundation of China under Grant Nos.51179093 and 91215301Specialized Research Fund for the Doctoral Program of Higher Education under Grant No.20130002110032
文摘This study aims to analyze seismic damage of reinforced outlet piers of arch dams by the nonlinear finite element （FE） sub-model method. First, the dam-foundation system is modeled and analyzed, in which the effects of infinite foundation, contraction joints, and nonlinear concrete are taken into account. The detailed structures of the outlet pier are then simulated with a refined FE model in the sub-model analysis. In this way the damage mechanism of the plain （unreinforced） outlet pier is analyzed, and the effects of two reinforcement measures （i.e., post-tensioned anchor cables and reinforcing bar） on the dynamic damage to the outlet pier are investigated comprehensively. Results show that the plain pier is damaged severely by strong earthquakes while implementation of post-tensioned anchor cables strengthens the pier effectively. In addition, radiation damping strongly alleviates seismic damage to the piers.
文摘Based on the use of finite element method(FEM) software ANSYS in electromagnetism, the electromagnetic processing of single winding 2D transformer and double winding 3D transformer are analyzed fully. Two examples, which are 2D static field and constant magnetic field, illustrate that the symbolization color vector pictures and curves obtained by ANSYS are not to achieve with other FEM softwares developed by individuals. For a transformer, the forces born by each winding pie and even each turn are analyzed separately under the conditions of unloading, normal load and short circuit. Especially under the condition of short circuit, there are pushing, pressing, suspending and vibrating between winding turns, and then the total winding is probably damaged. Therefore, the detail results give a basis to further fault diagnosis.
