scholarly journals Numerical analysis of ground motion in a South African mine using SPECFEM3D

2017 ◽  
Author(s):  
Xin Wang ◽  
Ming Cai
Keyword(s):  
Numerical Analysis ◽  
South African ◽  
Ground Motion

Experimental and analytical study on sliding vibration of a solid body

2019 ◽  
Vol 25 (18) ◽  
pp. 2480-2493 ◽  
Author(s):  
Hakan Yerlikaya ◽  
Satsuya Soda
Keyword(s):  
Numerical Analysis ◽  
Ground Motion ◽  
Computer Model ◽  
Structural Model ◽  
Base Isolation ◽  
Earthquake Ground Motion ◽  
Friction Behavior ◽  
Maximum Acceleration ◽  
Isolation System ◽  
Concrete Base

It is accepted that the use of base isolation systems within a structure offers a decreased amount of maximum acceleration value throughout the structure and provides a higher level of comfort and safety to the residents even during extremely strong ground motions. We want to propose a new low-cost structural system with the aforementioned benefits of the base isolation. A structural model was developed using an ultra-high-molecular-weight polyethylene film as a friction surface for the whole concrete base of a residential house, creating a friction-based base-isolation system. To understand the friction behavior between the two materials, a computer model was developed in SAP2000 software, and experiments were conducted to confirm the computer model’s proposed behavior. The created computer model is capable of accounting for the adjustments of the dynamic and static friction parameters depending on the velocity of the block. It is possible to conduct the numerical analysis with three-directional input to the system as well as nonlinear solving capabilities. The results of the numerical analysis are compared with the experiment results on a one-directional wave, along with the 1995 Kobe Earthquake ground motion record that had an input in three directions. The results confirm the reproducibility and predictable behavior of the proposed base-isolation method. The maximum acceleration of the concrete base will be no greater than nearly 30% of gravity acceleration regardless of the maximum acceleration of the ground motion.

scholarly journals Numerical Analysis of Ground Motion Effects in the Loess Regions of Western China

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Tuo Chen ◽  
Wei Ma ◽  
Jianzhou Wang
Keyword(s):  
Numerical Analysis ◽  
Ground Motion ◽  
Soil Structure ◽  
Seismic Vulnerability ◽  
Field Investigation ◽  
Western China ◽  
Triaxial Tests ◽  
High Porosity ◽  
Special Soil

Loess is widely distributed in the western part of China and its area comprises 6.6% of Chinese territory. Because of the characteristics of high porosity, low strength, and weak cementation, the loess is characterized by high seismic vulnerability which has been observed and confirmed by many researchers at home and abroad. The postquake field investigation and the laboratory study have shown that the ground motion effects, including the amplification effects and slope effects, were obvious in loess sites. Moreover, the causes of landslides, seismic subsidence, and liquefaction were mainly attributed to this special soil structure and properties. In this paper, based on the data of shear wave velocity of typical loess in Lanzhou region, combining the results of dynamic triaxial tests, the numerical analysis of ground motion effects in the loess regions is analyzed. The results reveal how the ground motion effects are checked and demonstrated the important role of numerical simulations while studying the characteristics of ground motions.

scholarly journals Seismic Fragility Analysis of Institutional Building of Pokhara University

2020 ◽  
Vol 1 (1) ◽  
pp. 31-39
Author(s):  
Narayan Ghimire ◽  
Hemchandra Chaulagain
Keyword(s):  
Numerical Analysis ◽  
Ground Motion ◽  
Structural Damage ◽  
Fragility Curves ◽  
Building Blocks ◽  
Ground Acceleration ◽  
Fragility Function ◽  
2015 Gorkha Earthquake ◽  
Ground Motion Parameter ◽  
Log Normal

Fragility curves are derived from fragility function that indicates the probability of damage of structure due to earthquake as a function of ground motion parameter. It helps to predict the level of structural damage and consequently reduce the seismic risk in specific ground motion. In this scenario, this study is focused on the construction of fragility curve of institutional reinforced concrete (RC) building of Pokhara University. For this, the building of School of Health and Allied Science (SHAS) is considered as a guiding case study. For the numerical analysis, the study building blocks are modelled in finite element-based software. The non-linear static and linear dynamic analyses are employed for numerical analysis. In dynamic analysis, building models are subjected to the synthetic accelerograms of the 2015 Gorkha earthquake. Based on the analyses, the analytical fragility curves are plotted in terms of probability of failure at every 0.1 g interval of peak ground acceleration (PGA) with log normal distribution. Finally, the results are highlighted for different seismic performance level in buildings: slight damage, moderate damage, extensive damage and complete damage for the earthquake of 475 years return period.

scholarly journals Numerical Analysis of Seismic Site Effects in Loess Region of Western China under Strong Earthquake Excitations

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Tuo Chen ◽  
Zhijian Wu ◽  
Yanhu Mu ◽  
Ping Wang ◽  
Qiyin Zhu
Keyword(s):  
Numerical Analysis ◽  
Ground Motion ◽  
Site Effects ◽  
Seismic Damage ◽  
Gansu Province ◽  
Seismic Excitation ◽  
Western China ◽  
Response Analysis ◽  
Mountainous Area ◽  
Seismic Site Effects

The Loess Plateau is one of the most tectonically and seismically active areas in the world. Observations from past strong earthquakes, particularly the Minxian–Zhangxian and Wenchuan earthquakes, have shown distinctive evidence of seismic site effects in the mountainous area of southeastern Gansu province. In this study, seismic damage in the loess areas of southeastern Gansu province induced by these earthquakes was investigated and briefly described. Different types of ground motion were selected, and the one-dimensional equivalent linear method was used for numerical analysis of the ground motion effects in the loess regions. Moreover, seismic response analysis of a typical loess tableland was conducted. The results showed that the seismic responses of a typical loess tableland under different seismic excitations have totally different dynamic characteristics. Moreover, the seismic damage in loess regions was more serious under far-field seismic excitation compared with near-field seismic excitation with the same peak acceleration. Through this study, the quantitative assessment of ground motion effects can be approximately estimated and the mechanism of site amplification effects on ground motion is further explained.

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