Study on the Behavior of Reinforced Retaining Wall Under Earthquake Loading Using FEM Analysis

2011 ◽  
Vol 421 ◽  
pp. 713-716
Author(s):  
Liang Jia
Keyword(s):  
Retaining Wall ◽  
Fem Analysis ◽  
Mechanical Analysis ◽  
Distribution Law ◽  
Nonlinear Fem ◽  
Plastic Model ◽  
Elastic Plastic ◽  
Backfill Soil ◽  
Pulling Force ◽  
Reinforced Retaining Wall

Nonlinear FEM (ADINA) is used for the mechanical analysis of reinforced retaining Wall. In this analysis,3-D nonlinear FEM model is built in consideration of the cooperation and interaction among backfill soil, panel and reinforcement strip; the backfill soil is simulated by nonlinear static and dynamic elastic-plastic model; the reinforcement is simulated by the dual-phase enhanced linear elastic-plastic model which can describe the intensified features of the reinforcement; the interaction of soil and retaining structures is simulated by the friction-element. The application to a project yields the distribution law of the strip’s most dollar point of force and the changing rules of the strip’s pulling force around earthquake.

Study the Axial Force-Time History of Reinforced Retaining Wall under Earthquake Loading

2012 ◽  
Vol 268-270 ◽  
pp. 802-805
Author(s):  
Jia Liang
Keyword(s):  
Axial Force ◽  
Retaining Wall ◽  
Time History ◽  
Nonlinear Fem ◽  
Plastic Model ◽  
Elastic Plastic ◽  
Backfill Soil ◽  
Before And After ◽  
Force Time ◽  
Reinforced Retaining Wall

In this analysis, 3-D nonlinear FEM model is built in consideration of the cooperation and interaction among backfill soil, panel and reinforcement strip; the backfill soil is simulated by nonlinear static and dynamic elastic-plastic model; the reinforcement is simulated by the dual-phase enhanced linear elastic-plastic model which can describe the intensified features of the reinforcement; the interaction of soil and retaining structures is simulated by the friction-element. By comparison of before and after earthquake, result is get of the axial force difference reinforcement layer. The increased maximum location is close to toe of the wall.

Study on Restoring Force Models of Nonlinear Uplift Behavior of Unanchored Oil Storage Tank Under Strong Seismic Excitation

2004 ◽  
Author(s):  
Hai Yuan ◽  
Kazuma Kawano ◽  
Shoichi Yoshida
Keyword(s):  
Fem Analysis ◽  
Seismic Excitation ◽  
Force Model ◽  
Restoring Force ◽  
Plastic Model ◽  
Elastic Plastic ◽  
Loop Area ◽  
Perfectly Plastic ◽  
Oil Storage ◽  
S Curve

It had been reported that some unanchored oil storage tanks had serious damages due to its uplift behavior during strong seismic excitation. In some past studies, the uplift behavior of tank was generally simulated using elastic-plastic hysteresis models. But recently, a static FEM analysis for the cyclic uplift behavior of the shell-to-bottom joint of tank has shown that the hysteresis loop of the uplift force and uplift displacement is similar to S-curve with a narrow loop area. In order to investigate the effects of S-curve Restoring Force Model (SRFM) on the nonlinear response when it is used to simulate the tank’s uplift action, in this paper, the seismic response analyses of tank are carried out by using three kinds of restoring force models including SRFM, the Elastic-Perfectly Plastic Model (EPPM) and the Bilinear Elastic-Plastic Model (BEPM), and their results are compared with each other to examine the differences. In the analyses, the tank is modeled with an equivalent mass-spring model, and three recorded earthquake accelerations scaled to 0.6G are taken as the representation of strong motions. Consequently, this paper shows that SRFM gives the maximum response displacement and ductility respectively among the three restoring force models.

Seismic Analysis of Soil Nailed Wall Using Finite Element Method

2012 ◽  
Vol 535-537 ◽  
pp. 2027-2031 ◽  
Author(s):  
Jian Chun Wu ◽  
Rong Shi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Seismic Analysis ◽  
Retaining Wall ◽  
Plastic Behavior ◽  
Soil Nailing ◽  
Nonlinear Fem ◽  
Elastic Plastic ◽  
Flexible Retaining Wall ◽  
Element Method

Using dynamic elastic-plastic finite element method, on the base of works together and interaction between loess and flexible retaining wall, 3-D nonlinear FEM (ADINA) is used to analyze and discussed the dynamic response of slope protected by soil nailing retaining wall under the EL-Centro and man-made Lanzhou accelerogram. A model that is capable of simulating the nonlinear static and dynamic elastic-plastic behavior of soil is used to model the soil, and a bilinear elastic-plastic model that has hardening behavior is used to model the soil nailing. Friction-element is employed to describe the soil-structure interaction behavior.The results show that the method is safe and credible. The results of the FEM dynamic analysis can be a useful reference for engineers of the design and construction of the soil nailed wall.

Finite Difference Study on Seismic Reinforcement Force of Geo-Grid Reinforced Soil Retaining Wall

2014 ◽  
Vol 488-489 ◽  
pp. 354-358
Author(s):  
Li Yan Wang ◽  
Xiao Lei Du ◽  
Fu Xing Zhang ◽  
Rong Qiu Xue
Keyword(s):  
Finite Difference ◽  
Seismic Design ◽  
Retaining Wall ◽  
Reinforced Soil ◽  
Design Parameters ◽  
Soil Stiffness ◽  
Backfill Soil ◽  
Reinforced Retaining Wall ◽  
Grid Reinforcement ◽  
Sensitive Parameters

For the geo-grid reinforced retaining wall, the reinforcement mechanism of seismic behavior is unclear, and there is no reasonable standard for seismic design. A non-linear finite difference method which is based on Lagrange method was applied to analyze internal reinforcement force of geo-grid under different design parameters. The elastic-plastic model is simulated to backfill soil and foundation, and the coupled elastic parameters are used to describe the interaction of soil and geo-grid. The design parameters include geo-grid reinforcement spacing, reinforcement length, backfill soil stiffness, and thickness of panel. Some distribution characters and sensitive parameters to the internal reinforcement force of geo-grid were achieved, which will be helpful to the seismic design of geo-grid reinforced soil retaining wall with integral panel.

Physical and numerical modelling of a geogrid-reinforced incremental concrete panel retaining wall

2016 ◽  
Vol 53 (12) ◽  
pp. 1883-1901 ◽  
Author(s):  
Yan Yu ◽  
Richard J. Bathurst ◽  
Tony M. Allen ◽  
Renald Nelson
Keyword(s):  
Numerical Modelling ◽  
Numerical Models ◽  
Retaining Wall ◽  
Compaction Pressure ◽  
Constitutive Models ◽  
Plastic Model ◽  
Elastic Plastic ◽  
Constant Stiffness ◽  
Linear Elastic ◽  
Physical Measurements

The paper presents the numerical modelling details using the finite difference method (FDM) to simulate the performance of a well-instrumented geogrid-reinforced incremental concrete panel soil retaining wall. Two different constitutive models were investigated for the backfill soil (linear elastic–plastic model and nonlinear elastic–plastic model). Both constant stiffness and strain-dependent secant stiffness models were used for the reinforcement elements. The paper provides valuable lessons to modellers to simulate the performance of this type of earth retaining structure. For example, parametric investigation of the effect of a constant Young’s modulus ranging from 40 to 120 MPa for the linear-elastic Mohr–Coulomb model had only minor influence on the wall facing displacements and reinforcement loads. However, the choice of magnitude of transient compaction pressure near the facing can result in large differences in facing displacements. The paper also demonstrates that the method of construction including the location, sequence, and stiffness of the temporary supports used to construct the wall plays an important role on measured and predicted wall performance. The physical measurements reported in this paper provide a benchmark for numerical modellers to verify other numerical models for walls of the type investigated here.

Response and Parameter Analysis of Reinforced Retaining Wall under Earthquake Loading

2012 ◽  
Vol 268-270 ◽  
pp. 702-705
Author(s):  
Jia Liang
Keyword(s):  
Seismic Response ◽  
Axial Force ◽  
Retaining Wall ◽  
Seismic Loading ◽  
Mechanical Analysis ◽  
Seismic Intensity ◽  
Parameter Analysis ◽  
Earthquake Loading ◽  
Reinforced Retaining Wall ◽  
Physical Mechanics

FEM is use for the mechanical analysis of reinforced retaining wall under earthquake loading. The main results are as following. The displacement and axial force increased with the increased seismic intensity. The displacement and axial force decreased with the increased the length of bar strip. The displacement and axial force decreased with the decreased the spacing of bar strip. The displacement and axial force decreased with the increased physical mechanics parameters of filling. Seismic response was similar under bilateral seismic loading and horizontal seismic loading, seismic response was slightly larger under bilateral seismic loading.

Testing and FEM Analysis of Geogrid-Reinforced Retaining Wall's Earth Pressure

2013 ◽  
Vol 405-408 ◽  
pp. 96-100
Author(s):  
Peng Lv ◽  
Guang Qing Yang ◽  
Jie Liu
Keyword(s):  
Retaining Wall ◽  
Earth Pressure ◽  
Fem Analysis ◽  
Filling Material ◽  
In Situ Test ◽  
Weight Density ◽  
Numerical Result ◽  
Reinforced Retaining Wall ◽  
Main Factor

Earth pressure is the main factor for retaining walls stability. To study the distribution regulation of earth pressure in geogrid-reinforced retaining wall, in-situ test has been carried out on an experimental wall and analyzed by finite element method. The numerical result fits well with the test data that prove the reliability, the paper analyze the influence for earth pressure distribution caused by factors of geogrid as: stiffness; length; spacing, and the weight density of filling material.

Buckling Load Estimation of Two-way Grid Domes Stiffened by Diagonal Braces Under Vertical Load

2021 ◽  
Vol 62 (1) ◽  
pp. 7-23
Author(s):  
Shiro Kato ◽  
Shoji Nakazawa ◽  
Yoichi Mukaiyama ◽  
Takayuki Iwamoto
Keyword(s):  
Slenderness Ratio ◽  
Fem Analysis ◽  
Buckling Load ◽  
Vertical Load ◽  
Imperfection Sensitivity ◽  
Plastic Buckling ◽  
Elastic Plastic ◽  
Alternative Formula ◽  
Efficient Scheme ◽  
Estimation Scheme

The present study proposes an efficient scheme to estimate elastic-plastic buckling load of a shallow grid dome stiffened by diagonal braces. The dome is circular in plan. It is assumed to be subject to a uniform vertical load and to be supported by a substructure composed of columns and anti-earthquake braces. Based on FEM parametric studies considering various configurations and degrees of local imperfections, a set of formulations are presented to estimate the elastic-plastic buckling load. In the scheme, the linear buckling load, elastic buckling load, and imperfection sensitivity are first presented in terms of related parameters, and the elasticplastic buckling load is then estimated by a semi-empirical formula in terms of generalized slenderness ratio using a corresponding plastic load. For the plastic load, the present scheme adopts a procedure that it is calculated by a linear elastic FEM analysis, while an alternative formula for the plastic load is also proposed based on a shell membrane theory. The validity of the estimation scheme is finally confirmed through comparison with the results based on FEM nonlinear analysis. The formulations are so efficient and simple that the estimation may be conducted for preliminary design purposes almost with a calculator. .

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