scholarly journals 3 DIMENSIONAL EARTHQUAKE RESPONSE ANALYSES USING TIME DOMAIN ENERGY TRANSMITTING BOUNDARIES FOR 2 DIMENSIONAL IN-PLANE AND ANTI-PLANE PROBLEMS

2011 ◽  
Vol 76 (664) ◽  
pp. 1077-1086
Author(s):  
Naohiro NAKAMURA
Keyword(s):  
Time Domain ◽  
Earthquake Response ◽  
3 Dimensional ◽  
Transmitting Boundaries

scholarly journals 3-Dimensional Time-Domain Full-Wave Analysis of Optical Array Antennas

2011 ◽  
Vol 8 (8) ◽  
pp. 1573-1589 ◽  
Author(s):  
Benedikt Oswald ◽  
Aleksejs Fomins ◽  
Arya Fallahi ◽  
Patrick Leidenberger ◽  
Peter Bastian
Keyword(s):  
Time Domain ◽  
Wave Analysis ◽  
3 Dimensional ◽  
Full Wave ◽  
Array Antennas ◽  
Full Wave Analysis

scholarly journals Viscoelastic Boundary Conditions for Multiple Excitation Sources in the Time Domain

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Chen Xia ◽  
Chengzhi Qi ◽  
Xiaozhao Li
Keyword(s):  
Finite Element ◽  
Seismic Response ◽  
Time Domain ◽  
Seismic Waves ◽  
Three Dimensional ◽  
Seismic Loads ◽  
Element Analysis ◽  
Artificial Boundaries ◽  
The Time Domain ◽  
Transmitting Boundaries

Transmitting boundaries are important for modeling the wave propagation in the finite element analysis of dynamic foundation problems. In this study, viscoelastic boundaries for multiple seismic waves or excitations sources were derived for two-dimensional and three-dimensional conditions in the time domain, which were proved to be solid by finite element models. Then, the method for equivalent forces’ input of seismic waves was also described when the proposed artificial boundaries were applied. Comparisons between numerical calculations and analytical results validate this seismic excitation input method. The seismic response of subway station under different seismic loads input methods indicates that asymmetric input seismic loads would cause different deformations from the symmetric input seismic loads, and whether it would increase or decrease the seismic response depends on the parameters of the specific structure and surrounding soil.

scholarly journals Time Domain Implementation of Transmitting Boundaries in ABAQUS for Discrete Soil-structure Interaction Systems

2020 ◽  
Vol 5 (3) ◽  
pp. 447-462
Author(s):  
J. Rama Raju Patchamatla ◽  
P. K. Emani
Keyword(s):  
Time Domain ◽  
Soil Structure ◽  
Seismic Waves ◽  
Seismic Analysis ◽  
Discrete Models ◽  
Soil Structure Interaction ◽  
Finite Domain ◽  
Infinite Domains ◽  
Structure Interaction ◽  
Transmitting Boundaries

Soil-structure-interaction (SSI) analyses are essential to evaluate the seismic performance of important structures before finalizing their structural design. SSI under seismic condition involves much more complex interaction with soil compared to the dynamic loads having source on the structure. Seismic SSI analysis requires due consideration of site-specific and structure-specific properties to estimate the actual ground motion (scattered motion) experienced at the base of the structure, and subsequently the effects of the scattered motion on the structure. Most challenging aspect of seismic SSI analysis is to implement transmitting boundaries that absorb the artificial reflections of stress waves at the truncated interface of the finite and infinite domains, while allowing the seismic waves to enter the finite domain. In this paper, the time domain implementation of seismic analysis of a soil-structure system is presented using classical discrete models of structure and interactive force boundary conditions for soil. These models represent typical SSI systems- a single Degree of Freedom (DOF) of a spherical cavity with mass attached to its wall, a two DOF system consisting of a mass attached by a nonlinear spring to a semi-infinite rod on elastic foundation, and a three DOF system with additional DOFs for modelling the structural stiffness and damping. The convolution integral representing the force boundary condition on the truncated interface, is evaluated interactively using UAMP user-subroutine in ABAQUS and applied as concentrated forces at the interface (truncated interface) nodes of the bounded domain or generalized-structure domain. The verification problems presented in the paper show the satisfactory performance of the developed MATLAB code and ABAQUS implementation with FORTRAN user-subroutines. The classical phenomena associated with the dynamic soil-structure systems are discussed through the present work.

Dynamics of Flexible Hose Riser Systems

1987 ◽  
Vol 109 (3) ◽  
pp. 244-248 ◽  
Author(s):  
H. Vogel ◽  
B. J. Natvig
Keyword(s):  
Time Domain ◽  
Analysis Method ◽  
Flexible Riser ◽  
Flexible Hose ◽  
3 Dimensional ◽  
Highly Effective ◽  
The Time Domain

The paper describes a highly effective method for computing the dynamics of the catenary-shaped suspension of flexible hose systems. The method accounts for a number of nonlinearities, it is 3-dimensional and it is performed in the time domain. The paper addresses the analysis method and demonstrates its effectiveness on a sample flexible riser analysis.

Feasibility Study on Forced Decoupling Method Analyzing Earthquake Response of Soil-Asymmetric Structure

2011 ◽  
Vol 368-373 ◽  
pp. 377-381
Author(s):  
Mei Li Wang ◽  
Jiao Xia Lan ◽  
Yan Hong Wang ◽  
Lei Yu Zhang
Keyword(s):  
Time Domain ◽  
Time Domain Analysis ◽  
Engineering Calculation ◽  
Earthquake Response ◽  
Asymmetric Structure ◽  
Direct Integral ◽  
Coupling Vibration ◽  
Decoupling Method ◽  
Matlab Program ◽  
Torsional Coupling

Time domain analysis on earthquake response of soil-asymmetric structure interaction system was carried out in this paper in order to study the feasibility of the forced decoupling method. Acoording to lateral-torsional coupling vibration equations of soil-asymmetric structure system, the direct integral MATLAB program in time domain were made used method. Feasibility of forced decoupling method was carried out by comparing the result in time domain with the result in frequency domain. Finally, it is derived that the results are very close to each other, which verify the feasibility of forced decoupling method. This conclusion can supply references to engineering calculation and design of structure.

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