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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 637-646页

作者： Wang Jingyue Ge Xinsheng Sun Jingyuan Liu Yasheng Shang Zhuo Wang Zhiqiang Tian Maoguo College of Civil Engineering Taiyuan University of TechnologyTaiyuan 030024China The 3rd Engineering Co.Ltd.of China Railway 18th Bureau Zhuozhou 072750China

Vibration induced by shield construction can lead to liquefaction of saturated *** on FLAC3D software,a numerical model of tunnel excavation is established and sinusoidal velocity loads with different frequencies are applied to the excavation *** pattern of the excess pore pressure ratio with frequency,as well as the dynamic response of soil mass under different frequency loads before excavation,is *** the velocity sinusoidal wave acts on the excavation surface of the shield tunnel with a single sand layer,soil liquefaction ***,the ranges and locations of soil liquefaction are different at different frequencies,which proves that the vibration frequency influences the liquefaction location of the *** sand-clay composite strata with liquefiable layers,the influence of frequency on the liquefaction range is different from that of a single *** the frequency range of 5-30 Hz,the liquefaction area and surface subsidence decrease with an increase in vibration *** research results in this study can be used as a reference in engineering practice for tunneling liquefiable strata with a shield tunneling machine.

关键词： shield tunnel liquefiable formation FLAC3D numerical simulation excess pore pressure ratio dynamic response analysis

An Arbitrary Polygonal Stress Hybrid Element for Structural dynamic response analysis

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Acta Mechanica Solida Sinica 2023年第5期36卷 692-701页

作者： Xin Zeng Ran Guo Lihui Wang Faculty of Civil Engineering and Mechanics Kunming University of Science and TechnologyKunming 650000China

This paper constructs a new two-dimensional arbitrary polygonal stress hybrid dynamic(APSHD)element for structural dynamic response ***,the energy function is established based on Hamilton's ***,the finite element time-space discrete format is constructed using the generalized variational principle and the direct integration ***,an explicit polynomial form of the combined stress solution is give,and its derivation process is shown in *** completing the theoretical construction,the numerical calculation program of the APSHD element is written in Fortran,and samples are *** show that the APSHD element performs well in accuracy and ***,it is insensitive to mesh distortion and has low dependence on selecting time steps.

关键词： Stress hybrid element method Arbitrary polygonal element dynamic response analysis Polynomial stress function solution

A trigonometric interval method for dynamic response analysis of uncertain nonlinear systems

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Science China(Physics,Mechanics & Astronomy) 2015年第4期58卷 45-57页

作者： LIU ZhuangZhuang WANG TianShu LI JunFeng School of Aerospace Tsinghua University

This paper proposes a new non-intrusive trigonometric polynomial approximation interval method for the dynamic response analysis of nonlinear systems with uncertain-but-bounded parameters and/or initial *** method provides tighter solution ranges compared to the existing approximation interval *** consider trigonometric approximation polynomials of three types:both cosine and sine functions,the sine function,and the cosine ***,special interval arithmetic for trigonometric function without overestimation can be used to obtain interval *** interval method using trigonometric approximation polynomials with a cosine functional form exhibits better performance than the existing Taylor interval method and Chebyshev interval ***,two typical numerical examples with nonlinearity are applied to demonstrate the effectiveness of the proposed method.

关键词： non-intrusive interval method dynamic response analysis uncertain nonlinear systems trigonometric polynomial ap-proximation interval arithmetic

Structural dynamic responses analysis applying differential quadrature method

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第11期7卷 1831-1838页

作者： PU Jun-ping ZHENG Jian-jun College of Architecture and Civil Engineering Zhejiang University of Technology Hangzhou 310032 China

Unconditionally stable higher-order accurate time step integration algorithms based on the differential quadrature method (DQM) for second-order initial value problems were applied and the quadrature rules of DQM, computing of the weighting coefficients and choices of sampling grid points were discussed. Some numerical examples dealing with the heat transfer problem, the second-order differential equation of imposed vibration of linear single-degree-of-freedom systems and double-degree-of-freedom systems, the nonlinear move differential equation and a beam forced by a changing load were computed, respectively. The results indicated that the algorithm can produce highly accurate solutions with minimal time consumption, and that the system total energy can remain conservative in the numerical computation.

关键词： Differential quadrature method (DQM) dynamic response analysis Conservation of energy

An explicit finite element method for dynamic analysis in three-medium coupling system and its application

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Acta Seismologica Sinica(English Edition) 2003年第3期16卷 272-282页

作者：赵成刚李伟华王进廷李亮 School of Civil Engineering & Architecture Northern Jiao-tong UniversityBeijing 100044China School of Civil Engineering & Hydropower Engineering Tsing Hua UniversityBeijing 100084China School of Civil Engineering & Architecture Northern Jiao-tong UniversiytBeijing 100044China

In this paper, an explicit finite element method to analyze the dynamic responses of three-medium coupled systems with any terrain is developed on the basis of the numerical simulation of the continuous conditions on the bounda-ries among fluid saturated porous medium, elastic single-phase medium and ideal fluid medium. This method is a very effective one with the characteristic of high calculating speed and small memory needed because the formulae for this explicit finite element method have the characteristic of decoupling, and which does not need to solve sys-tem of linear equations. The method is applied to analyze the dynamic response of a reservoir with considering the dynamic interactions among water, dam, sediment and basement rock. The vertical displacement at the top point of the dam is calculated and some conclusions are given.

关键词： fluid saturated porous medium-elastic single-phase medium-ideal fluid medium coupled system dynamic response analysis explicit finite element method

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Non-intrusive hybrid interval method for uncertain nonlinear systems using derivative information

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Acta Mechanica Sinica 2016年第1期32卷 170-180页

作者： Zhuang-Zhuang Liu Tian-ShuWang Jun-Feng Li School of Aerospace Tsinghua University

This paper proposes a new non-intrusive hybrid interval method using derivative information for the dynamic response analysis of nonlinear systems with uncertain-but- bounded parameters and/or initial conditions. This method provides tighter solution ranges compared to the existing polynomial approximation interval methods. Interval arith- metic using the Chebyshev basis and interval arithmetic using the general form modified affine basis for polynomials are developed to obtain tighter bounds for interval computation. To further reduce the overestimation caused by the ＂wrap- ping effect＂ of interval arithmetic, the derivative information of dynamic responses is used to achieve exact solutions when the dynamic responses are monotonic with respect to all the uncertain variables. Finally, two typical numerical examples with nonlinearity are applied to demonstrate the effective- ness of the proposed hybrid interval method, in particular, its ability to effectively control the overestimation for specific timepoints.

关键词： Non-intrusive hybrid interval method dynamic response analysis Uncertain nonlinear systems Polynomial approximation Interval arithmetic Derivative information

Study on Model Tests and Hydrodynamic Force Models for Free Spanning Submarine Pipelines Subjected to Earthquakes

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China Ocean Engineering 2010年第2期24卷 305-320页

作者：李明高李昕董汝博周晶关炯 State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology IKM Ocean Design

A test rig is built to model the dynamic response of submarine pipelines with an underwater shaking table in the State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, China. Model tests are carried out to consider the effects of exciting wave directions and types. Based on the experimental results, two hydrodynamic force models derived from Morisen equation and Wake model are presented respectively. By use of hydrodynamic force models suitable for free spanning submarine pipelines under earthquakes, diseretized equations of motion are obtained and finite element models are established to analyze dynamic response of free spanning submarine pipeline subjected to multi-support seismic excitations. The comparison of numerical results with experimental results shows that the improved Morison and Wake hydrodynamic force models could satisfactorily predict dynamic response on the free spanning submarine pipelines subjected to earthquakes.

关键词： free spanning submarine pipelines model tests hydrodynamic force models dynamic response analysis earthquke