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Earthquake Engineering and Engineering Vibration 2021年第1期20卷 89-100页

作者： Mohsen Isari reza tarinejad Faculty of Civil Engineering University of TabrizTabrizEast Azerbaijan ProvinceIran

In this study,a comprehensive parametric analysis was performed on non-uniform excitation of V-shaped topography using the boundary element method in time *** this purpose,wave scattering analysis was carried out on a topography subjected to the SV-wave for different predominant frequencies and shape *** on the numerical results,new coherence and time delay functions are proposed to generate non-uniform ground motion for topographic *** efficiency and accuracy of the proposed functions for real engineering problems are indicated by comparison with observations reported in previous literature.

关键词： site effect time delay boundary element method amplification coherence function

A new solution to estimate the time delay on the topographic site using time domain 3D boundary element method

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Earthquake Engineering and Engineering Vibration 2020年第3期19卷 611-623页

作者： reza tarinejad Mohsen Isari Abdollah Sohrabi-Bidar Faculty of Civil Engineering University of TabrizTabrizIran School of Geology College of ScienceUniversity of TehranTehranIran

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 *** 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 *** this research,a three-dimensional model of the Pacoima Dam site is *** time domain 3 D boundary element method is used to apply non-uniform excitation at the dam *** model is subjected to vertically propagating incident SH and P *** time delay can be characterized by calculating the value of the time delay for which the cross-correlation between two records is ***,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 ***,a code was developed for generating the spatially variation of seismic ground *** results show that the proposed functions have an acceptable accuracy in estimating the time delay to generate non-uniform ground motion.

关键词： delay boundary element

A new boundary element solution to evaluate the geometric effects of the canyon site on the displacement response spectrum

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Earthquake Engineering and Engineering Vibration 2019年第2期18卷 267-284页

作者： reza tarinejad Mohsen Isari Abbasali Taghavi Ghalesari Department of Civil Engineering University of Tabriz Department of Civil Engineering The University of Texas at El Paso 500 W University Ave.

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.

关键词： canyon boundary element method widening ratio site effect wave scattering amplifi cation

A procedure to predict the precise seismic response of arch dams in time domain using boundary element formulation

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第4期11卷 790-803页

作者： Abbasali TaghaviGhalesari Mohsen Isari reza tarinejad Abdollah Sohrabi-Bidar Center for Transportation Infrastructure Systems University of Texas at El PasoEl PasoTX79968USA Faculty of Civil Engineering University of TabrizTabriz***Iran School of Geology University College of ScienceUniversity of TehranTehran14155-6619Iran

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 *** accurate three-dimensional (3D) model of the dam canyon is implemented into the computer code BEMSA to investigate the seismic response of the *** analyses are performed in time domain with a linearly elastic constitutive model for the *** modeling procedure has been validated by the results reported in the existing *** 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 *** the cases considered,the incident SV wave has led to the maximum amplification of incident motions,especially at the left side of the *** results indicate that the proposed procedure can be employed for accurate prediction of a dam response during an earthquake.

关键词： Boundary element method Spatially varying earthquake ground motion Pacoima dam Topography Incident wave

Predicting TBM penetration rate in hard rock condition:A comparative study among six XGB-based metaheuristic techniques

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Geoscience Frontiers 2021年第3期12卷 201-213页

作者： Jian Zhou Yingui Qiu Danial Jahed Armaghani Wengang Zhang Chuanqi Li Shuangli Zhu reza tarinejad School of Resources and Safety Engineering Central South UniversityChangsha 410083China Institute of Research and Development Duy Tan UniversityDa Nang 550000Vietnam School of Civil Engineering Chongqing UniversityChongqing 400045China Faculty of Civil Engineering University of Tabriz29 Bahman Blvd51666 TabrizIran

A reliable and accurate prediction of the tunnel boring machine(TBM)performance can assist in minimizing the relevant risks of high capital costs and in scheduling tunneling *** research aims to develop six hybrid models of extreme gradient boosting(XGB)which are optimized by gray wolf optimization(GWO),particle swarm optimization(PSO),social spider optimization(SSO),sine cosine algorithm(SCA),multi verse optimization(MVO)and moth flame optimization(MFO),for estimation of the TBM penetration rate(PR).To do this,a comprehensive database with 1286 data samples was established where seven parameters including the rock quality designation,the rock mass rating,Brazilian tensile strength(BTS),rock mass weathering,the uniaxial compressive strength(UCS),revolution per minute and trust force per cutter(TFC),were set as inputs and TBM PR was selected as model *** with the mentioned six hybrid models,four single models i.e.,artificial neural network,random forest regression,XGB and support vector regression were also built to estimate TBM PR for comparison *** models were designed conducting several parametric studies on their most important parameters and then,their performance capacities were assessed through the use of root mean square error,coefficient of determination,mean absolute percentage error,and *** of this study confirmed that the best predictive model of PR goes to the PSO-XGB technique with system error of(0.1453,and 0.1325),R^(2) of(0.951,and 0.951),mean absolute percentage error(4.0689,and 3.8115),and a10-index of(0.9348,and 0.9496)in training and testing phases,*** developed hybrid PSO-XGB can be introduced as an accurate,powerful and applicable technique in the field of TBM performance *** conducting sensitivity analysis,it was found that UCS,BTS and TFC have the deepest impacts on the TBM PR.

关键词： TBM penetration rate Hard rock XGB-based hybrid model Predictive model Metaheuristic optimization