|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | A new boundary element solution to evaluate the geometric effects of the canyon site on the displacement response spectrum显示文摘This paper presents a step-by-step procedure using the three-dimensional boundary element approach to study the behavior of semi-circular canyons under seismic shear waves. The boundary element code TDASC allows utilization for various canyon geometries, evaluation of concurrent seismic waves and calculation of the ground motions on canyons due to an excitation at any arbitrary point of the incident field. Considering the widening ratio of the canyon(including prismatic, semi-prismatic and non-prismatic canyons), wave characteristics(wavelength, dimensionless period, direction) and maximum amplification pattern, the solution was applied to carry out a series of parametric studies. It was shown that canyon form can significantly affect the displacement amplification, especially at the points located on its edges. By increasing the wave dimensionless frequency(η > 1), the amplification pattern becomes more complex. On the basis of the results from a variety of considered cases, a new expression has been presented for the limiting wavelength beyond which the widening of the canyon will not have a major effect on the displacement amplification. To verify the reliability of the proposed approach, the obtained results, expressed in terms of displacement amplitude, were compared with those from the available published literature and a reasonably good agreement was observed. | Reza Tarinejad Mohsen Isari Abbasali Taghavi Ghalesari | 2019 | Earthquake Engineering and Engineering Vibration2019，18，2： | 6 |
| 2 | A new solution to estimate the time delay on the topographic site using time domain 3D boundary element method显示文摘This study focuses on investigating spatial variation of ground motion that has great influence on the dynamic behavior of the large structures located on the surface topography.One of the most effective parameters on the spatial variation of ground motion is the difference between the arrival time of seismic waves in different points located on the abutments.In this research,a three-dimensional model of the Pacoima Dam site is prepared.The time domain 3 D boundary element method is used to apply non-uniform excitation at the dam supports.This model is subjected to vertically propagating incident SH and P waves.The time delay can be characterized by calculating the value of the time delay for which the cross-correlation between two records is maximized.Finally,to obtain the time delay in a topographic site,a function considering effective parameters such as the height from the canyon base,wave velocity and predominant frequency,is presented.Furthermore,a code was developed for generating the spatially variation of seismic ground motions.The results show that the proposed functions have an acceptable accuracy in estimating the time delay to generate non-uniform ground motion. | Reza Tarinejad Mohsen Isari Abdollah Sohrabi-Bidar | 2020 | Earthquake Engineering and Engineering Vibration2020，19，3： | 2 |
| 3 | Meniscus tears in children显示文摘 | Bel isari G Samora W Klinqele K | | 0，，01： | 1 |
| 4 | A procedure to predict the precise seismic response of arch dams in time domain using boundary element formulation显示文摘In this context,a new boundary element algorithm based on the time-convoluted traction kernels is employed to evaluate the spatially varying earthquake ground motions of the Pacoima dam in the USA subjected to SH,SV and P incident waves.An accurate three-dimensional (3D) model of the dam canyon is implemented into the computer code BEMSA to investigate the seismic response of the dam.The analyses are performed in time domain with a linearly elastic constitutive model for the medium.This modeling procedure has been validated by the results reported in the existing literature.According to the results of this study,the response of the dam to earthquake waves is generally influenced by predominant frequency of the incident motion,surface topography,relative distance of observation points,and type of the incident seismic wave.For the cases considered,the incident SV wave has led to the maximum amplification of incident motions,especially at the left side of the dam.The results indicate that the proposed procedure can be employed for accurate prediction of a dam response during an earthquake. | Abbasali TaghaviGhalesari Mohsen Isari Reza Tarinejad Abdollah Sohrabi-Bidar | 2019 | Journal of Rock Mechanics and Geotechnical Engineering2019，11，4： | 1 |
| 5 | Introducing an effective coherence function to generate non-uniform ground motion on topographic site using time-domain boundary element method显示文摘In this study,a comprehensive parametric analysis was performed on non-uniform excitation of V-shaped topography using the boundary element method in time domain.For this purpose,wave scattering analysis was carried out on a topography subjected to the SV-wave for different predominant frequencies and shape ratios.Based on the numerical results,new coherence and time delay functions are proposed to generate non-uniform ground motion for topographic irregularities.The efficiency and accuracy of the proposed functions for real engineering problems are indicated by comparison with observations reported in previous literature. | Mohsen Isari Reza Tarinejad | 2021 | Earthquake Engineering and Engineering Vibration2021，20，1： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员