Research the Layered Structure Affect on Seismic Dynamic Response of Rock Slope

2011 ◽  
Vol 382 ◽  
pp. 439-443
Author(s):  
Fa You A ◽  
Ji Ming Kong ◽  
Zhen Qiang Ni
Keyword(s):  
Dynamic Response ◽  
Layered Structure ◽  
Rock Slope ◽  
Dynamic Responses ◽  
Deformation And Failure ◽  
Response Characteristics ◽  
The Stability ◽  
Bedding Slope ◽  
Dip Slope ◽  
Better Than

The deformation and failure induced by Wenchuan earthquake between bedding and anti-dip slope existence very big difference. The number and size of the bedding slope deformation and failure are much more than the anti-dip slope according to the investigation and analysis. In order to analyze the layered structure affect on seismic dynamic response of rock Slope. As bedding and anti-dip slope is the study object and the seismic dynamic responses of different layered structure slope have been studied by using ANSYS finite element method in this study. Analysis shows that slope as a structure, the internal structure different lead to the slope seismic dynamic response is also different. The bedding and anti-dip slope seismic dynamic response is discontinuous or mutations in the slope as layered structure interface the boundary. And the seismic dynamic stress, displacement and acceleration of the bedding slope are always greater than the anti-dip slope. The seismic response characteristics further increased the deformation and failure probability of bedding slope. The results consistent with the investigation conclusion that the stability of anti-dip better than the anti-dip slope

Nonlinear Vibration Analysis of Viscoelastic Isolator

2012 ◽  
Vol 160 ◽  
pp. 140-144
Author(s):  
Chao Zhou ◽  
Cai Mao Zhong
Keyword(s):  
Dynamic Response ◽  
Fractional Derivative ◽  
Nonlinear Dynamic ◽  
Harmonic Balance Method ◽  
Nonlinear Damping ◽  
Vibration Isolator ◽  
Response Characteristics ◽  
Nonlinear Dynamic Equation ◽  
The Stability ◽  
Stiffness And Damping

Research on nonlinear dynamic response of passive vibration isolator, which was excited by foundation vibration and isolated by viscoelastic material was done. Nonlinear stiffness was expressed by the cubic polynomial function of deformation and nonlinear damping was characterized by viscoelastic fractional derivative operator. Then the fractional derivative nonlinear dynamic equation of passive vibration isolator was established. The dynamic response characteristics were analyzed by harmonic balance method and the frequency response equation and amplitude-frequency curve were obtained, and furthermore, the influence of nonlinearity on system was analyzed. Finally, the stability and the stable interval of the periodic solution were argued by the Floquet theory. The result s indicates that the proposed equation can precisely describe the dynamic characteristics of viscoelastic vibration isolator. The ignorance of nonlinearity of stiffness and damping will result in obvious error. The proposed method provides theoretic reference for design of viscoelastic isolator and the evaluation of its effect.

Research on the Seismic Performance of Zipper Frames

2013 ◽  
Vol 351-352 ◽  
pp. 545-549 ◽  
Author(s):  
Hai Feng Yu ◽  
Tian Ya Wang ◽  
Li Bin Shi
Keyword(s):  
Dynamic Response ◽  
Seismic Performance ◽  
Design Method ◽  
Dynamic Responses ◽  
Braced Frames ◽  
Braced Frame ◽  
Steel Consumption ◽  
Better Than

In order to investigate the seismic performance of zipper frames, three 10-storey structure models, including a zipper frame with tension zipper columns, a zipper frame with weak zipper columns and a chevron braced frame, were designed. Some indexes, including the natural periods, steel consumption and dynamic response under frequent and rare earthquakes, were analyzed and compared. The results show that, the dynamic responses of the three structures are similar to each other and all of them can meet the requirement of no-damage under frequent earthquakes and no-collapse under rare earthquakes provided by the GB50011 code, but the steel consumption for the zipper frames is less than that of the chevron braced frames, indicating the comprehensive seismic performance of the zipper frame is better than the chevron braced frame. However, it is also found that the design method of the zipper columns is conservative and a more reasonable design method of the zipper columns is needed to be provided.

The Influences on Turnout Dynamic Responses due to its Irregularities

2011 ◽  
Vol 105-107 ◽  
pp. 1181-1186 ◽  
Author(s):  
Yang Cao ◽  
Wang Ping ◽  
Wei Hua Zhao ◽  
Cai You Zhao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Response ◽  
Structure Design ◽  
Simulation Software ◽  
Dynamic Responses ◽  
Dynamics Simulation ◽  
Combined Effects ◽  
Vehicle Model ◽  
The Stability

A vehicle model and a movable-point simple turnout model were established, and the influences on dynamic responses caused by turnout irregularities when train passes through No.18 turnout was analyzed by using the turnout dynamics simulation software based on finite element method. It shows that turnout dynamic responses are influenced by the combined effects of various types of irregularities, which produce bigger dynamic response than single irregularity. In the turnout devise and use, the distance between slide plate and switch rail or nose rail should be as close as possible, the position arrangements of traction points should be optimized and the insufficient displacement should be eliminated as much as possible; No.18 turnout structure design is reasonable, which can ensure the safety and the stability when train passes over turnout.

Study on the Correlation between the Stability of Slope and the Intensity of Rock Layer by Simulation Experiment

2011 ◽  
Vol 243-249 ◽  
pp. 2591-2595
Author(s):  
Ping Lu Huang ◽  
Cong Xin Chen
Keyword(s):  
Rock Slope ◽  
Simulation Experiment ◽  
Similarity Theory ◽  
Rock Layer ◽  
Rock Slide ◽  
Deformation And Failure ◽  
Shearing Strength ◽  
Stability Of Slope ◽  
Weak Plane ◽  
The Stability

Based on similarity theory, the two geologic mechanics models with different intensity of rock layer is established. The paper introduces the design and process of the experimentation. The correlation between the stability of consequent rock slope and the intensity of rock layer is studied. Results obtained show that deformation and breakage of the consequent slope first take place at joints and crannies near the surface. The bigger the intensity of rock layer is, the steadier the slope is. The water in rock cranny can reduce the shearing strength of the slope and lead to land slide. The deformation and failure mode of the slope with low intensity of rock layer is that rock slide along the weak plane as a whole.

Study on the Stability Influence Factors of Bedding Slope under the Action of Seismic Load

2014 ◽  
Vol 501-504 ◽  
pp. 1560-1565 ◽  
Author(s):  
A. Fayou ◽  
Shi Mao Dong ◽  
Ya Hong Fan
Keyword(s):  
Friction Coefficient ◽  
Influence Factors ◽  
Earthquake Magnitude ◽  
Seismic Load ◽  
Ansys Software ◽  
Vibration Direction ◽  
Deformation And Failure ◽  
Stability Of Slopes ◽  
The Stability ◽  
Bedding Slope

Taking Magunyan landslide located in Beichuan County as a typical example, the stability influence factors of bedding slopes under the action of seismic load were analyze by using the ANSYS software in this study. The influence factors include excavation, interlayer cohesion and friction coefficient, earthquake magnitude and vibration direction. The related analysis showed that significant influences of excavation existed on the deformation and failure of slopes. And the bedding slopes stability increasing with the interlayer cohesive, the interlayer friction coefficient and earthquake magnitude increases. The analysis also showed that horizontal vibration is the most detrimental on the stability of slopes.

Dynamic Elastic-Plastic Analysis of Reinforcement Geogrids Applied in High Earth-Rockfilled Dam Slope

2011 ◽  
Vol 243-249 ◽  
pp. 4520-4523 ◽  
Author(s):  
Ya Lin Zhu ◽  
Xian Jing Kong ◽  
De Gao Zou
Keyword(s):  
Elastic Modulus ◽  
Dynamic Response ◽  
Slip Surface ◽  
Analysis Method ◽  
Deformation And Failure ◽  
Slope Reinforcement ◽  
Plastic Analysis ◽  
Set Up ◽  
The Stability ◽  
Surface Length

Considering the dynamic response of high earth-rockfilled dam, dynamic elasto-plastic analysis method for dam slope reinforcement with geogrids was set up. Based on this model, the paper analyzed the deformation and failure mechanism of dam slope, as well as the effect of connection, the length, the spacing and the stiffness of geogrid on dam with deformation. The results show that geogrids with high elastic modulus and proper extensibility will apparently reduce the deformation and imporve the stability of the dam slope. In the case of high dam slope, the reinforcement length of geogrids is supposed to be 2a (a is the slip surface length), and the spacing is 2m.

Dynamic Response of Pre/Post Buckled Thin-Walled Structure under Thermo-Acoustic Loading

2011 ◽  
Vol 80-81 ◽  
pp. 536-541 ◽  
Author(s):  
Yun Dong Sha ◽  
Ji Yong Li ◽  
Zhi Jun Gao
Keyword(s):  
Dynamic Response ◽  
Dynamic Responses ◽  
Transverse Displacement ◽  
Response Characteristics ◽  
Thin Walled Structures ◽  
Fem Method ◽  
Operating Environments ◽  
Thin Walled ◽  
Frequency Changes ◽  
High Level

Advanced aircraft and spacecraft structures are exposed to increasingly severe operating environments, including a combination of mechanical, aerodynamic, acoustic and thermal loads. Such loading conditions can cause thin-walled structures to respond in a nonlinear fashion and exhibit complex response characteristics. This paper investigates the dynamic response of pre/post buckled thin-walled structure under high level random acoustic loading. Firstly, different orders of critical buckling temperatures and modal frequencies under alternative temperatures are obtained using Finite Element Method (FEM), and the modal frequency changes in a disorder fashion are discussed in detail. Then with coupled BEM/FEM method, the dynamic responses including transverse displacement, strain and stress of a stiffened rectangular plate under thermo-acoustic loading are simulated. By comparing the response characteristics of the plate in pre/post buckled conditions, some valuable conclusions are derived, which can be used to explain the response behaviours of thin-walled structures.

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