Seismic Damage Predictions and Antiseismic Performance Researches of Single-Story Brick Column Workshops in Lushan Ms7.0 Earthquake

2014 ◽  
Vol 638-640 ◽  
pp. 1842-1847
Author(s):  
Ming Zhen Wang ◽  
Bai Tao Sun ◽  
Pei Lei Yan
Keyword(s):  
Finite Element ◽  
Failure Mechanism ◽  
Seismic Damage ◽  
Field Investigation ◽  
Damage Prediction ◽  
Affected Area ◽  
Damage Characteristics ◽  
Finite Element Software ◽  
Storage Room

Single-story brick column workshops are widely used as the production or storage room of medium and small-sized enterprises in China. Based on the field investigation of single-story brick column workshops at the earthquake-affected area after Lushan 7.0 earthquake, the damage characteristics of workshops are summed up. Damage prediction analyses are carried out for two typical single-story brick column workshops, and failure mechanism researches are conducted by using ABAQUS finite element software for a workshop. Finally, according to the results of failure mechanism researches, some relevant suggestions of the seismic reinforcement are put forward.

Analysis of Pipe-Soil Interaction for a Miniature Pipejacking

2006 ◽  
Vol 22 (3) ◽  
pp. 213-220 ◽  
Author(s):  
K. J. Shou ◽  
F. W. Chang
Keyword(s):  
Finite Element ◽  
Failure Mechanism ◽  
Physical Modeling ◽  
Driving Force ◽  
Numerical Models ◽  
Surface Subsidence ◽  
Finite Element Software

AbstractIn this study, physical and numerical models were used to analyze pipe-soil interaction during pipejacking work. After calibrating with the physical modeling results, the finite element software ABAQUS [1] was used to study the pipejacking related behavior, such as surface subsidence, failure mechanism, pipe-soil interaction, etc. The results show that the driving force in the tunnelling face is very important and critical for pipejacking. Surface subsidence is mainly due to the lack of driving force, however, excessive driving force could cause the unfavorable surface heaving problem. It also suggests that the depth of the pipe is critical to determine a proper driving force to stabilize the tunnelling face.

Failure Mechanism of a Slope Anti-Sliding Pile

2013 ◽  
Vol 639-640 ◽  
pp. 593-597
Author(s):  
Lin Chen ◽  
Yong Yao ◽  
Jiong Yang ◽  
Zhao Qiang Zhang
Keyword(s):  
Finite Element ◽  
Failure Mechanism ◽  
Reduction Method ◽  
Strength Reduction ◽  
Strength Reduction Method ◽  
Analysis Method ◽  
Feasible Method ◽  
Finite Element Software ◽  
Slope Excavation ◽  
Pile Design

According to finite element strength reduction method，the article has discussed the failure mechanism of anti-sliding pile by using finite element software MIDAS /GTS ，exploration report and anti-sliding pile design data.The comparative analysis shows that the failure of anti-siding pile is contributed by the slope excavation and rainwater.The analysis method and results can provide reference significance to other anti-sliding pile design.This paper also provide a feasible method for prediction of consequence in slope excavation.

Earthquake Damage Forms of Multi-Story Brick Masonry Structure and their Mechanical Analysis

2014 ◽  
Vol 1065-1069 ◽  
pp. 1408-1411
Author(s):  
Hong Biao Liu
Keyword(s):  
Failure Mechanism ◽  
Mechanical Analysis ◽  
Seismic Damage ◽  
Masonry Structure ◽  
Brick Masonry ◽  
Earthquake Damage ◽  
Seismic Capacity ◽  
Earthquake Disaster ◽  
Damage Characteristics ◽  
Important Significance

In order to know seismic damage characteristics of multi-story brick masonry structure and improve its seismic capability, five kinds of earthquake damage or collapse forms of multi-story masonry brick structure are summed up based on earthquake disaster survey, each of which is analyzed with mechanics. And the failure mechanism of each seismic damage form of multi-story brick masonry structure are proposed, which provides effective engineering experience for the seismic or anti-collapse design of multi-story masonry brick structure. The research has the important significance in improving the seismic capacity of multi-story brick masonry structure and reducing the earthquake casualties.

Numerical Simulation on the Form of Reinforcement of Reinforced Concrete Beam with Openings

2013 ◽  
Vol 444-445 ◽  
pp. 884-888
Author(s):  
Xue Han ◽  
Zheng Liu
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Failure Mechanism ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Plasticity Model ◽  
Damage Factor ◽  
Finite Element Software ◽  
Concrete Damaged Plasticity

In order to research the stress performance of reinforced concrete beam with different forms of reinforcement around the openings, a numerical simulation on reinforced concrete beam with circle openings is made by using the finite element software. The constitutive relation of concrete offered by the 2010 edition of code for design of concrete structures and the concrete damaged plasticity model is adopted in this article. The damage factor is introduced in the process of modeling, which can reflect the damage of beams with different forms of reinforcement directly and help to reveal the failure mechanism of members. Thus we can propose the optimization of reinforcement method.

Research on Earthquake Resistant Materials in Mountain Tunnels Crossing Fault

2010 ◽  
Vol 150-151 ◽  
pp. 719-722
Author(s):  
Qiong Wang ◽  
En Dong Guo ◽  
Zai Rong Wang ◽  
Dan Yang
Keyword(s):  
Finite Element ◽  
Seismic Damage ◽  
First Principle ◽  
Peak Acceleration ◽  
Fault Movement ◽  
Finite Element Software ◽  
Earthquake Resistant ◽  
Lining Material ◽  
Mountain Tunnels ◽  
Displacement Peak

Seismic damage, such as falling, fissure and dislocation of the lining may happen at location of fault movement. The model of enhancing stiffness and that of adding seismic decrease layer are built by the finite element software MIDAS to compare the two earthquake-resistant methods. Some useful results are obtained: a)The displacement is decreased, but the peak acceleration and first principle stress of the lining are increased in the model of enhancing the lining materials stiffness. b) The displacement, peak acceleration and first principle stress are all decreased in the model of adding seismic decrease layer. c) The max-displacement when using c20 as lining material or adding seismic decrease layer is in the area of fault, but that of the model when using c40 as lining material is in the area of entrance.

Analysis of the Thermal-Structure Coupling of the Band Brake

2011 ◽  
Vol 121-126 ◽  
pp. 499-503
Author(s):  
Fu Cai Hu ◽  
Hu Lin Li ◽  
Bei Si Xie
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Stress Field ◽  
Failure Mechanism ◽  
Optimization Design ◽  
3D Model ◽  
Thermal Structure ◽  
Nonlinear Coupling ◽  
Finite Element Software ◽  
Braking Process

A 3D model of band brake is established with PRO/E software, and its thermal-structure nonlinear coupling is analyzed with finite element software MSC.Marc. Temperature field and stress field distribution of the brake band and the friction linings in braking process are calculated, and the failure mechanism of the connecting bolt is analyzed. All these provide references for optimization design.

scholarly journals Seismic Damage Prediction Method for Lining Structures Based on the SEDR Principle

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Q. Zheng ◽  
C. L. Xin ◽  
Y. S. Shen ◽  
Z. M. Huang ◽  
B. Gao
Keyword(s):  
Numerical Simulation ◽  
Density Ratio ◽  
Prediction Method ◽  
Damage Mechanism ◽  
Seismic Damage ◽  
Field Investigation ◽  
Underground Engineering ◽  
Damage Prediction ◽  
Cracking Modes ◽  
Simulation Results

The safety and stability of lining structures are core concerns of tunnel and underground engineering. It is crucial to determine whether a lining structure would crack and which direction the crack would expand with seismic excitation. In previous literature, the principle based on stress and strain has been widely used to predict the seismic damage of lining structures, whereas it cannot specify the cracking modes. Taking account of that deficiency, this paper introduces the strain energy density ratio (SEDR) principle and proposes a seismic damage prediction method for lining structures, which can precisely predict the crack positions and expansion directions. Moreover, numerical simulations of the typical seismic damage sections of two tunnels in the Great Wenchuan Earthquake and a calculating example of the theoretical equations are conducted to verify the proposed method. In summary, the numerical simulation results show that the arch springing cracks first, and the invert cracks next; then the cracks expand to the spandrel, and finally, they form oblique cracks, annular cracks, and longitudinal cracks, whose positions and patterns are in accordance with the field investigation results. In terms of the calculating example results, the obtained two-fold SEDR and cracking angle θ are 1.87 and −6.28°, respectively, which are consistent with the numerical simulation results. Therefore, one can see that the proposed seismic damage prediction method based on the SEDR principle is quite accurate. This method can be used to predict the seismic damage of lining structures and provide a reference for the research of the damage mechanism of tunnels.

Seismic damage of gravity abutment in liquefied ground

2019 ◽  
Vol 17 (1) ◽  
pp. 53-76
Author(s):  
Haitao Wang ◽  
Jiayu Shen ◽  
Da Gao
Keyword(s):  
Finite Element ◽  
Influencing Factors ◽  
Seismic Damage ◽  
Damage Mode ◽  
Soil Pressure ◽  
Tangshan Earthquake ◽  
Content Type ◽  
Finite Element Software ◽  
Binding Force ◽  
Calculation Process

Purpose Abutment damage in liquefied ground is an important form of seismic damage of bridge structure. This paper aims to further research the effect of beam restriction on seismic damage mode of abutment in liquefied ground. Design/methodology/approach Based on the investigation of the seismic damage of Shengli Bridge in Tangshan earthquake, the finite element software dynamic effective stress analysis for ground (UWLC) is used to simulate the seismic damage of Shengli Bridge, and the results were compared with the actual seismic damage results. Then, the influences of the horizontal binding force of the beam, the liquefaction layer thickness, the top weight of the abutment, the peak acceleration, the liquefaction layer buried depth and the type of the foundation soil on the abutment seismic damage model are studied. Findings The results show that numerical simulation results are consistent with the actual seismic damage, and it is feasible to use UWLC software to simulate seismic damage. The results show that the seismic failure mode of the gravity abutment in liquefied ground is slip–rotation coupling type, not single slip type or rotation type. The large deformation of abutment bottom layer, horizontal binding force of the beam and post-stage soil pressure are the main reasons for abutment rotation or even destruction. Research limitations/implications A series of basic assumptions are used in the calculation process in this paper. The gravity abutment is defined as the elastic body and neglects its local deformation. The soil layer is a homogeneous isotropic. The consolidation process and the drainage boundary problem are not considered in the calculation process. Therefore, the paper may have some limitations. Originality/value To further research the seismic damage mode and influencing factors of abutment in liquefied ground, in this paper, based on the investigation of the seismic damage of Shengli Bridge in Tangshan earthquake, the finite element software UWLC is used to simulate the seismic damage of Shengli Bridge, and the results were compared with the actual seismic damage results. The seismic damage mode and influencing factors of gravity abutment in liquefied ground have been studied.

Numerical Analysis on Failure Behavior of Composite Sandwich Plate

2013 ◽  
Vol 284-287 ◽  
pp. 178-182
Author(s):  
Yao Hsu
Keyword(s):  
Finite Element ◽  
Failure Mechanism ◽  
Sandwich Plate ◽  
Core Material ◽  
Structural Safety ◽  
Failure Behavior ◽  
Sandwich Plates ◽  
Composite Sandwich ◽  
Finite Element Software ◽  
The Impact

The Composite sandwich plate is made of two laminated face-sheets and one core material. Since such a kind of structure has many advantages, they have been widely used in structural manufacturing industry. However, when sandwich plates are impacted by transverse loadings, damages that are usually invisible would occur inside the sandwich plate and those damages would potentially reduce the structural safety. Therefore, it is necessary to elucidate the failure mechanism and how they affect the failure behaviors of sandwich structures for safety purpose. To this end, the present study is to investigate the impact failure behaviors of sandwich plates subjected to a rigid spherical impactor. Numerical simulation approach is carried out by finite element method. To predict the initial failure, several failure criteria to face-sheets and core material are proposed. In addition, to further simulate the progressive failure behaviors, a stiffness modification method is proposed and incorporated into the finite element software. The analytical results show that the local failure including fiber breakages, delamination, core cracking and plasticity is the main failure mechanism of cases studied. Furthermore, parametric study is also conducted and discussed in the paper.

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