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Assessment of earthquake-induced landslide hazard zoning using the physics-environmental coupled Model

Journal of Mountain Science 2023年第9期20卷 2644-2664页

作者： ZENG Ying ZHANG Ying-bin LIU Jing XU Pei-yi ZHU Hui YU Hai-hong HE Yun-yong Department of Geotechnical Engineering School of Civil EngineeringSouthwest Jiaotong UniversityChengdu 610031China CREC Sichuan Eco-City Investment Co. Ltd.Chengdu 420562China Sichuan Highway Planning SurveyDesign and Research Institute Ltd.Chengdu 610041China

In order to prevent and mitigate disasters,it is crucial to immediately and properly assess the spatial distribution of landslide hazards in the earthquake-affected ***,there are primarily two categories of assessment techniques:the physical mechanism-based method(PMBM),which considers the landslide dynamics and has the advantages of effectiveness and proactivity;the environmental factor-based method(EFBM),which integrates the environmental conditions and has high *** order to obtain the spatial distribution of landslide hazards in the affected area with near realtime and high accuracy,this study proposed to combine the PMBM based on newmark method with EFBM to form newmark-Information value model(N-IV),newmark-Logic regression model(N-LR)and newmark-Support Vector Machine model(N-SVM)for seismic landslide hazard assessment on the Ludian Mw 6.2 earthquake in *** predicted spatial hazard distribution was compared with the actual cataloged landslide inventory,and frequency ratio(FR),and area under the curve(AUC)metrics were used to verify the model's plausibility,performance,and *** to the findings,the model's accuracy is ranked as follows:N-SVM>N-LR>N-IV>*** an AUC value of 0.937,the linked N-SVM was discovered to have the best *** research results indicate that the physics-environmental coupled model(PECM)exhibits accuracy gains of 46.406%(N-SVM),30.625%(N-LR),and 22.816%(N-IV)when compared to the conventional newmark *** shows varied degrees of improvement from 2.577%to 12.446%when compared to the single *** study also uses the Ms 6.8 Luding earthquake to evaluate the model,showcasing its trustworthy in forecasting power and steady *** the suggested PECM in this study can adapt to complicated earthquake-induced landslides situations,it aims to serve as a reference for future research in a similar field,as well as to help with emergency planning and response in earthquakepro

关键词： Earthquake-induced landslides newmark method Coupled model Ludian earthquake Landslide distribution

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An efficient time-integration method for nonlinear dynamic analysis of solids and structures

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Science China(Physics,Mechanics & Astronomy) 2013年第4期56卷 798-804页

作者： LIU TianYun LI QingBin ZHAO ChongBin State Key Laboratory of Hydro-Science and Engineering Tsinghua University Computational Geosciences Research Centre Central South University

This paper presents an efficient time-integration method for obtaining reliable solutions to the second-order nonlinear dynamic problems in structural engineering. This method employs both the backward-acceleration differentiation formula and the trapezoidal rule, resulting in a self-starting, single step, second-order accurate algorithm. With the same computational effort as the trapezoidal rule, the proposed method remains stable in large deformation and long time range solutions even when the trapezoidal rule fails. Meanwhile, the proposed method has the following characteristics: (1) it is applicable to linear as well as general nonlinear analyses; (2) it does not involve additional variables (e.g. Lagrange multipliers) and artificial parameters; (3) it is a single-solver algorithm at the discrete time points with symmetric effective stiffness matrix and effective load vectors; and (4) it is easy to implement in an existing computational software. Some numerical results indicate that the proposed method is a powerful tool with some notable features for practical nonlinear dynamic analyses.

关键词： two-order system conservation of energy backward differentiation formula newmark method nonlinear dynamics unconditional stability direct time integration

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NONLINEAR DYNAMIC ANALYSIS OF A LAMINATED HYBRID COMPOSITE PLATE SUBJECTED TO TIME-DEPENDENT EXTERNAL PULSES

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Acta Mechanica Solida Sinica 2012年第6期25卷 586-597页

作者： Mehmet Senyer Zafer Kazanci Turkish Air Force Academy Aeronautics and Space Technologies Institute34149 Ye silyurt Istanbul Turkey Turkish Air Force Academy Aerospace Engineering Department34149 Ye silyurt Istanbul Turkey

Nonlinear dynamic responses of a laminated hybrid composite plate subjected to time-dependent pulses are investigated. Dynamic equations of the plate are derived by the use of the virtual work principle. The geometric nonlinearity effects are taken into account with the yon Karman large deflection theory of thin plates. Approximate solutions for a clamped plate are assumed for the space domain. The single term approximation functions are selected by considering the nonlinear static deformation of plate obtained using the finite element method. The Galerkin method is used to obtain the nonlinear differential equations in the time domain and a MATLAB software code is written to solve nonlinear coupled equations by using the newmark method. The results of approximate-numerical analysis are obtained and compared with the finite element results. Transient loading conditions considered include blast, sine, rectangular, and triangular pulses. A parametric study is conducted considering the effects of peak pressure, aspect ratio, fiber orientation and thicknesses.

关键词： nonlinear vibration hybrid composite plate newmark method dynamic loads

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ELASTIC DYNAMIC ANALYSIS OF MODERATELY THICK PLATE USING MESHLESS LRPIM

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Acta Mechanica Solida Sinica 2009年第2期22卷 116-124页

作者： Ping Xia Shuyao Long Hongxue Cui State Key Laboratory of Advanced Design and Manufacture for Vehicle Body Hunan University Changsha 410082 China College of Mechanics and Aerospace Engineering Hunan University Changsha 410082 China Department of Mechanical Engineering Hunan Institute of Engineering Xiangtan 411101 China

A meshless local radial point interpolation method （LRPIM） for solving elastic dy-namic problems of moderately thick plates is presented in this paper. The discretized system equation of the plate is obtained using a locally weighted residual method. It uses a radial basis function （RBF） coupled with a polynomial basis function as a trial function,and uses the quartic spline function as a test function of the weighted residual method. The shape function has the properties of the Kronecker delta function,and no additional treatment is done to impose essen-tial boundary conditions. The newmark method for solving the dynamic problem is adopted in computation. Effects of sizes of the quadrature sub-domain and influence domain on the dynamic properties are investigated. The numerical results show that the presented method can give quite accurate results for the elastic dynamic problem of the moderately thick plate.

关键词： meshless method moderately thick plate local radial point interpolation method,dynamic analysis newmark method

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Estimation of Seismic Landslide Hazard in the Eastern Himalayan Syntaxis Region of Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2017年第2期91卷 658-668页

作者： DU Guoliang ZHANG Yongshuang YANG Zhihua Javed IQBAL TONG Bin GUO Changbao YAO Xin WU Ruian Institute of Geomechanics Chinese Academy of Geological SciencesKey Laboratory of Neotectonic Movement and GeohazardBeijing 100081China China Institute of Geo-Environment Monitoring Beijing 100081China Department of Earth Sciences Abbottabad University of Science and TechnologyAbbottabad 22010Pakistan

The eastern Himalayan syntaxis is one of the most tectonically active and earthquake-prone regions on Earth where earthquake-induced geological disasters occur frequently and caused great damages. With the planning and construction of Sichuan-Tibet highway, Sichuan-Tibet railway and hydropower development on the Yarlung Zangbo River etc. in recent years, it is very important to evaluate the seismic landslide hazard of this region. In this paper, a seismic landslide hazard map is produced based on seismic geological background analysis and field investigation using newmark method with 10% PGA exceedance probabilities in future 50 years by considering the influence of river erosion, active faults and seismic amplification for the first time. The results show that the areas prone to seismic landslides are distributed on steep slopes along the drainages and the glacier horns as well as ridges on the mountains. The seismic landslide hazard map produced in this study not only predicts the most prone seismic landslide areas in the future 50 years but also provides a reference for mitigation strategies to reduce the exposure of the new building and planning projects to seismic landslides.

关键词： probabilistic seismic hazard newmark method seismic landslide the eastern Himalayan syntaxis Tibet Proto-Tethys

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Theoretical and numerical solutions of maglev train induced vibration

Theoretical and numerical solutions of maglev train induced ...

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第七届海峡两岸工程力学研讨会

作者：朱聖浩梁志章何婉珊 Department of Civil Engineering National Cheng-Kung University

This paper proposed an efficient method based on theoretical equations to solve the dynamic interaction problem between the Timoshenko beam and maglev vehicles.A systematic PI numerical scheme is developed for the control system of the maglev *** major advantage is that only one simple equation required in the control calculation,although the original control system is fairly *** vehicle model is an assemblage of spring-dampers and rigid links,and zero speed springs and dampers can be used to simulate the soil foundation under the *** simulations indicate that a large time step length can be used in the proposed method to obtain stable and accurate results.

关键词： Damper Maglev train newmark method PI controller Rail irregularities Timoshenko beam Vibration

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THE X-FEM WITH NEW CRACK TIP ENRICHMENT FUNCTIONS FOR DYNAMIC FRACURE PROBLEMOF AN INTERFACE CRACK BETWEEN PIEZOELECTRICPIEZOMAGNETIC LAYERED STRUCTURE

THE X-FEM WITH NEW CRACK TIP ENRICHMENT FUNCTIONS FOR DYNAMI...

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2016年全国压电和声波理论及器件应用研讨会

作者： Zhen YAN Wen-jie FENG Department of Engineering Mechanics Shijiazhuang Tiedao University Shijiazhuang

Background, Motivation and Objective Compared with the single-phase piezoelectric or piezomagnetic materials, the piezoelectricpiezomagnetic layered structures have more excellent magnetoelectric coupling effects, and have been widely used in smart devices. However, piezoelectric-piezomagnetic layered structures tend to fracture or debonding on the interface during manufacturing and/or under in-service loading conditions, especially impact loadings. So, it is essential to research the interface crack between piezoelectric-piezomagnetic layered structures under impact loading. On the other hand, due to the mathematical complexity involved, a plenty of analytical studies have been limited to the relatively simple geometries and loading boundary conditions. For more general cases, it is necessary to numerical techniques. As a powerful and accurate tool in computational fracture mechanics, the extended finite element method(X-FEM) was originally proposed by Belytschko and Black. In the X-FEM, crack discontinuity is represented by enriching the classical finite element approximation by discontinuous and crack tip enrichment functions based on the framework of the partition of unity. The accuracy of the X-FEM depends on the selecting of the crack tip enrichment functions. So it is an important task to derive the more suitable crack tip enrichment functions for an interface crack between piezoelectric-piezomagnetic layered structure. From the above, this paper studies the dynamic fracture problems of an interface crack between piezoelectric-piezomagnetic layered structure under coupled electro-magneto-mechanical impact loadings by means of the X-FEM with new crack tip enrichment functions. Statement of Contribution/methods In this paper, a more accurate dynamic X-FEM is employed. In order to improve the accuracy, it is essential to obtain the suitable crack tip enrichment functions. Firstly, with a certain combination of piezoelectric and piezomagnetic materials, the asymp

关键词： Piezoelectric-piezomagnetic layered structure Interface crack Extended finite element method New crack tip enrichment function newmark method

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