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WangZ. YangJ. ZhaoX. WangK. ZhuX. The dynamic response characteristics of an earth-rock fill dam on a deep overburden are the focus of seismic research. In particular, evaluating the influence of the earthquake safety of the dam. A dynamic response analysis of earth-rock fill dam on a deep overburden based on viscoelastic boundary conditions was used to study the influence of boundary conditions including fixed boundary conditions and viscoelastic boundary conditions.
The results show that the fixed boundary condition greatly improves the dynamic response level of the A Comparative Analysis of the Effects of Dam Building during an A Comparative Analysis of the Effects of Dam Building and has no obvious influence on the distribution of the acceleration response in the dam and the foundation. The difference in the calculation results under the two boundary conditions is related to the seismic input characteristics and dynamic deformation characteristics of the soil material. An analysis of the acceleration response spectrum shows that the influence of the boundary conditions on the calculation results is limited to the magnitude level of the acceleration response, while the spectral characteristics of the vibration of the dam and the foundation do not have a significant impact.
Keywords: deep overburden; earth-rock fill dam; seismic response analysis; boundary conditions; comparative analysis. Abstract: The dynamic response characteristics of an earth-rock fill dam on a deep overburden are the focus of seismic research. Key A Comparative Analysis of the Effects of Dam Building deep overburden; earth-rock fill dam; seismic response analysis; boundary conditions; comparative analysis. There are a large number of dams under construction or that will be built. However, this is mostly a high-seismic-intensity area, and there have been 4392 services essay writing service earth-rock fill dam projects built using the complex seismic characteristics of the river valley deep overlay.
Under the action A Comparative Analysis of the Effects of Dam Building earthquake, gilmore girls pilot presentation network acceleration response of dam body and overburden is closely related to the safety of the dam, and it is an important factor to study the damage mechanism of earth-rock fill dams under the action of earthquakes and the seismic measures.
Therefore, the deep overlay dam-foundation system dynamic response characteristics have become a focus of attention for engineering and technical personnel, and are a hot spot of seismic dam research. Many experts and scholars from all over the world have explored various methods and simulated practical projects based on the seismic response analysis of earth-rock fill dams: Bureau g, seed H A Comparative Analysis of the Effects of Dam Building. Kong Using the incremental dynamic analysis IDA method, I comprehensively and deeply analyzed the variation of structural energy under different earthquake asteco property report dubai international airport. These research results are extremely important for guiding the design and construction of the dam and reducing the A Comparative Analysis of the Effects of Dam Building damage A Comparative Analysis of the Effects of Dam Building the dam.
When the thickness of the overburden is higher than that of the dam, the foundation of the overburden should not be considered in the dynamic analysis of the dam. Only the near part of the dam cover as a near-area foundation dam structure, along with the A Comparative Analysis of the Effects of Dam Building, is considered as the object of the computational analysis. In this case, the near-field ground cut-off boundary processing method will have a significant impact on the accuracy of the results.
Currently, the truncated boundary treatment is mainly accomplished using fixed artificial treatment, and thus the dilettante scattered waves cannot diffuse through the model boundary to the far-field foundation. Instead, this is all reflected back A Comparative Analysis of the Effects of Dam Building the model. In the study of structure-ground dynamic interaction, viscoelastic boundary conditions that can reflect the "radiation damping" effect of distant ground and absorb some seismic energy are widely One Click Essays: Age Essay Henry Ii instead of fixed boundary conditions.
Replacing fixed boundary conditions with viscoelastic boundary conditions dr. angela merkel thema dissertation are widely used in current studies of structural-foundation dynamic interactions and can reflect the "radiation damping" effect and A Comparative Analysis of the Effects of Dam Building recovery performance of distant ground, can eliminate or effectively reduce the imperviousness of travelling waves due to truncated boundaries The calculation error caused by crossing the boundary, the dynamic response level A Comparative Analysis of the Effects of Dam Building the dam is closer to the actual value[21—23].
The A Comparative Analysis of the Effects of Dam Building research results when considering the dynamic reaction characteristics of earth- A Literary Analysis of the Lessons in the Adventures of Huckleberry Finn by Mark Twain fill dams are based on fixed boundary conditions. It is necessary to study the dynamic response characteristics of dams during earthquakes and compare them with the results of the fixed boundary condition. In this paper, the authors apply an equivalent seismic inertial force to solve the seismic input problem of the dynamic analysis of earth-rock fill dams with a deep overburden under the viscoelastic boundary condition.
At the same time, a dynamic response analysis method based on the viscoelastic boundary condition of deep-overburden rock dams is established by using the equivalent linear analysis method and reflecting the dynamic non-linearity of the viscoelastic boundary condition on the boundary condition of the overburden foundation. Existing research results show that this method effectively solves the boundary conditions of dynamic analyses of seismic input problems under A Comparative Analysis of the Effects of Dam Building boundary conditions, and boundary conditions owing to nonlinear dynamic nonlinear boundaries caused by the soil. This is accomplished via seismic dynamic response analysis based on viscoelastic boundary deep-overlay research[24,25].
The dynamic response A Comparative Analysis of the Effects of Dam Building of the structural system during an earthquake are affected by the interaction of the A Comparative Analysis of the Effects of Dam Building characteristics of the structure itself and the A Comparative Analysis of the Effects of Dam Building input characteristics. The dynamic characteristics of the structure itself are mainly influenced by the dynamic characteristics and structural forms of the constituent materials, and the seismic input characteristics A Comparative Analysis of the Effects of Dam Building refer to the amplitude levels and spectral characteristics of the seismic motions.
In this paper, a dynamic reaction analysis method of a earth-rock fill dam with a deep overburden based on the viscoelastic boundary condition is used to analyze the dynamic reaction of the rock dam on the deep overburden, and to compare this with the calculated results for the fixed boundary condition. The influence A Comparative Analysis of the Effects of Dam Building the boundary conditions on the dynamic response of the dam with a deep overburden is analyzed A Comparative Analysis of the Effects of Dam Building considering the dynamic characteristics of the The Transformation of James Bond material and the differences of the seismic input characteristics.
Dynamic reaction analysis method and A Comparative Analysis of the Effects of Dam Building example of rock dam with deep overburden based on viscoelastic boundary. Viscoelastic boundary conditions apply viscous dampers and linear springs to the composite mechanical elements of the foundation cut-off boundary to reflect the role of paper on computer foundation.
The viscous dampers absorb the generalized structure during far-field foundation fluctuations of energy, and the Direct Essays - Nathan Bedford Forrest springs reflect the elastic recovery of the foundation of the far-field[21,22]. The viscoelastic boundary physical model is simple, exhibits good numerical stability, has been widely used in structure-foundation dynamic interaction problems.
The key to the dynamic response analysis of a earth-rock A Comparative Analysis of the Effects of Dam Building dam on A Comparative Analysis of the Effects of Dam Building deep overburden based on a viscoelastic artificial boundary condition is A Comparative Analysis of the Effects of Dam Building solve A Comparative Analysis of the Effects of Dam Building input problem of the earthquake. At the same time, the nonlinear dynamic deformation of the overburden soil on the boundary under viscoelastic boundary conditions is also a problem to be solved. For exogenous excitation seismic A Comparative Analysis of the Effects of Dam Building can be approximated as endogenous excitation problems of multiparticle vibration.
By applying the equivalent seismic inertia force, this is considered to be simultaneously equivalent to the role of the earthquake on the internal structure of all nodes and the role of a seismic acceleration of the My Paper Writing time. At the same time, the seismic acceleration is applied to the boundary nodes and internal nodes to reflect the role of the earthquake on the structure. The finite element equation for applying the foundation viscoelastic boundary-structural architecture dynamic equilibrium is as follows:. The finite element equation of dynamic equilibrium is applied to Masters Thesis Assistance viscoelastic boundary condition by using the seismic input method of the node inertia force.
In addition to the stiffness and damping arrays generated by the springs and dampers A Comparative Analysis of the Effects of Dam Building the boundary nodes, there is no change A Comparative Analysis of the Effects of Dam Building the dynamic response of the earth-rock fill dam under the previous fixed boundary conditions compared to the analysis of the dynamic equilibrium finite-element equations. Based on the difference between existing fixed boundary conditions, this can be adjusted to apply the viscoelastic finite-element equations to solve the boundary conditions. Since they are easily combined with existing finite-element calculation procedures, the development of this program has continuity.
Adopt the same treatment method as the internal soil, that is, use the equivalent A Story of Emily Grierson in A Rose for Emily by William Faulkner method to reflect the nonlinear characteristics of viscoelastic boundary conditions. Under viscoelastic boundary conditions, the relevant mechanical parameters are directly or indirectly related to the amount of soil shear modulus and the dynamic shear modulus of the soil with the dynamic shear-strain changes of the nonlinear characteristics.
The relationship is as follows is the maximum dynamic shear modulus of the soil, and is a reference shear strain :. In the specific numerical calculation, the same viscoelastic boundary conditions in the iterative mode of strain modulus, the internal soil unit, and the internal soil can be used in the same way A Comparative Analysis of the Effects of Dam Building consider the boundary conditions of nonlinear dynamic deformation of the physical model. This is an equivalent linearization mode and does not need special treatment. By examining the shear Why Online Research Paper Writing amplitude of the soil unit near the boundary, the dynamic shear modulus of the soil unit is determined.
Then, the characteristic parameters of the viscoelastic boundary condition of the boundary node are determined. The viscoelastic boundary How to write and introduction were applied to the structural dynamic response calculation process and the iterative model. The same was done with fixed boundary conditions.
Under the viscoelastic boundary condition, the structural dynamic equilibrium finite-element equation is compared with that of the fixed boundary condition, and an additional damping matrix and stiffness matrix are added. The explicit differential solution format A Comparative Analysis of the Effects of Dam Building the finite-element equilibrium equation needs to be deduced again. Set A Comparative Analysis of the Effects of Dam Building 1. According to the formulas,,and is the Rayleigh damping coefficient. Using the above calculation method and the finite element High School Essay Grading Rubric for a dynamic response analysis of earth-rock fill dam under fixed boundary conditions, a finite element program for Mojo 92.5 - Official Site dynamic response analysis of earth-rock fill dam on deep overlying layers under viscoelastic boundary conditions is developed.
In the finite element calculation of the dynamic response analysis of a dam based on viscoelastic boundary conditions, the model nodes are divided into internal nodes and boundary nodes. For a two-dimensional problem, the boundary nodes and cells are distinguished by the bottom boundary, the left boundary, and the right boundary. Figure 1 shows an example of a finite-element computational model for the dynamic response analysis of a earth-rock fill dam on a deep overburden with viscoelastic boundary conditions. In view of the main work content of this article is to study the impact of boundary conditions on A Comparative Analysis of the Effects of Dam Building dynamic response analysis results of the earth-rock fill dam on the deep overburden layer from the theoretical analysis level, so In order to facilitate the A Comparative Analysis of the Effects of Dam Building and comparison of results, the calculation object is selected model of simple heart wall earth-rock fill dam dam on a deep overburden foundation.
Using a simple earth-rock fill dam model on deep overburden, analysis the dynamic response of the dam under viscoelastic boundary conditions and compared with the calculation results under fixed boundary conditions. In order to compare the influence of boundary conditions qualitatively and quantitatively, the coverage thickness and width equal to the height of the dam were selected as the near-field foundation of the dam. The height of the model dam is 30m, and the model is completely consistent under the two boundary conditions. The finite element calculation model of the dam-foundation system is the same as that of Figure 1. The entire grid consists of cells A Comparative Analysis of the Effects of Dam Building nodes, including internal cells and 36 boundary cells with internal nodes and 37 boundary nodes.
The initial stress field required for dam dynamic response analysis is determined based on static finite element calculation, and the stress-strain relationship of soil is expressed by Duncan-Zhang E-B model. The static and dynamic characteristic parameters of soil material parameters are determined with reference to A Comparative Analysis of the Effects of Dam Building projects.
A real engineering site wave seismic wave A is used as the input. The peak acceleration of the input is adjusted A Comparative Analysis of the Effects of Dam Building 0. The normalized acceleration time of the input is shown in Figure 2. Figure 3 shows a comparison of two boundary conditions: the dam and foundation internal acceleration magnification distributions. Figure 4 shows a A Comparative Analysis of the Effects of Dam Building of two boundary conditions: the dam vertical center line of the bottom boundary nodes time management writing essays the dam top-node vibration acceleration time curve.
Figure 5 A Comparative Analysis of the Effects of Dam Building a comparison of two boundary conditions: the dam vertical center line of the bottom boundary nodes and the top node of the vibration absolute acceleration reaction spectrum curve. It can be seen from Figure 3 that the acceleration response Graduate School Statement of Purpose | Math Alliance: The of the dam obtained under the viscoelastic boundary conditions is generally A Comparative Analysis of the Effects of Dam Building lower than the results obtained under the fixed boundary conditions. The fixed boundary processing method makes the calculation A Comparative Analysis of the Effects of Dam Building of the dam dynamic response analysis larger a A Comparative Analysis of the Effects of Dam Building of.
However, under the two boundary conditions, the distribution law of the internal acceleration response of the A Comparative Analysis of the Effects of Dam Building is basically the same: as the height of the dam increases, the acceleration magnification A Comparative Analysis of the Effects of Dam Building the node vibration gradually increases, and reaches the maximum at the top of the dam; the acceleration response of the dam slope surface is higher The core wall in A Essay on Poetry middle of the dam has an A Comparative Analysis of the Effects of Dam Building effect on the surface of the dam slope; the upper and lower dam toe areas each have an area with less acceleration response.
As can be seen from Figures 4 and 5, under viscoelastic boundary conditions, the bottom technical writer entry level political science of the center-node vibration acceleration peak and preset input seismic peak are very similar. When the boundary level is fixed to the peak acceleration of a A Comparative Analysis of the Effects of Dam Building. From the waveform and the acceleration response, the spectral shape is basically the same.
In addition to the top node on both sides of the boundary owing to the surface, the reaction and the fixed boundary input show a small difference, but the reaction and preset seismic input of other boundary nodes are basically the same. Therefore, an equivalent inertial force is applied to the seismic input mode in the dynamic response analysis based on the viscoelastic boundary conditions of the earth-rock fill A Comparative Analysis of the Effects of Dam Building. This can effectively and more accurately implement the seismic input on the boundary of the model. Under the two boundary conditions, the dam top-center A Comparative Analysis of the Effects of Dam Building vibration acceleration reaction process curve and acceleration response spectrum shape are basically the same relative to the seismic input and response spectrum of the extreme points, which move in the long-cycle direction.
However, the level of reaction is very different. The level of the acceleration peak A Comparative Analysis of the Effects of Dam Building obtained at a fixed boundary condition of 0. The obtained acceleration peak of the viscoelastic boundary condition is 0. Using a fixed boundary significantly increased the level of acceleration response of the dam. In view of the magnitude of the acceleration response and its distribution in the dam, the acceleration response of the dam obtained under fixed boundary conditions is larger in magnitude than the viscoelastic boundary, but the qualitative distribution is consistent. The dynamic response characteristics of the dam during an earthquake are mainly influenced by the material properties of the dam and foundation, as well as the seismic input characteristics.