scholarly journals Impact between buildings during earthquakes

1994 ◽  
Vol 27 (2) ◽  
pp. 107-113
Author(s):  
A. J. Carr ◽  
P. J. Moss
Keyword(s):  
Dynamic Analysis ◽  
Numerical Study ◽  
Structural Parameters ◽  
Seismic Excitation ◽  
Relative Importance ◽  
Two Dimensional ◽  
Analysis Program ◽  
Framed Structures ◽  
Design Values ◽  
The Impact

A numerical study of the parameters affecting the impact between adjacent buildings subjected to seismic excitation has been carried out in an endeavour to quantify the relative importance of the structural parameters. A two-dimensional inelastic dynamic analysis program was used to model various combinations of adjacent framed structures subjected to ground accelerograms and where the frames are assumed to be separated by distances sufficiently small as to permit contact. Collisions were modelled using special contact elements which will transmit forces when the specified gap has been closed. It will be shown that where there are adjoining frames are of different heights, large increases in response are observed in the upper part of the taller frame. Pounding can also amplify the effects of localised changes in stiffness and strength up the frame-, producing member demands greatly in excess of the normal design values.

Discrete element modeling of shock-induced particle jetting

2018 ◽  
Vol 32 (12n13) ◽  
pp. 1840049 ◽  
Author(s):  
Kun Xue ◽  
Haoran Cui
Keyword(s):  
Packing Density ◽  
External Surface ◽  
Structural Parameters ◽  
Discrete Element ◽  
Relative Importance ◽  
Two Dimensional ◽  
Discrete Element Modeling ◽  
Impulsive Loads ◽  
Key Events ◽  
Particle Jetting

The dispersal of particle shell or ring by divergent impulsive loads takes the form of coherent particle jets with the dimensions several orders larger than that of constituent grain. Particle-scale simulations based on the discrete element method have been carried out to reveal the evolution of jets in semi-two-dimensional rings before they burst out of the external surface. We identify two key events which substantially change the resulted jetting pattern, specifically, the annihilation of incipient jets and the tip-slipping of jets, which become active in different phases of jet evolution. Parametric investigations have been done to assess the correlations between the jetting pattern and a variety of structural parameters. Overpressure, the internal and outer diameters of ring as well as the packing density are found to have effects on the jet evolution with different relative importance.

scholarly journals Local and global assessments of a subsea riser-spool connection under dropped impact loads

2021 ◽  
Vol 1201 (1) ◽  
pp. 012049
Author(s):  
Z Liu ◽  
R Igland ◽  
S Bruaseth
Keyword(s):  
Energy Level ◽  
Dynamic Analysis ◽  
Static Analysis ◽  
Numerical Study ◽  
Structure Design ◽  
Time Range ◽  
Impact Loads ◽  
Static And Dynamic Analysis ◽  
Impact Impulse ◽  
The Impact

Abstract Subsea riser tube and spool is often used together to connect the riser of jacket to flowline or pipeline. Due to its limited size (less than 200 m), the location is within the lifting zones of the platform. Consequently, the dropped object hazard has potential high risk and needs to be checked. This paper presents a numerical study on accessing the structural dynamics of a subsea riser connection under the dropped container impact loads. De-coupled local and global models were established. The impact impulse was obtained from local impact analysis by Abaqus Explicit solver, in which deformations from container and pipeline are both captured. The impact energy level is in line with the risk assessment. The global model was built by ANSYS APDL macros. A simple input file is only needed for end users. The nonlinear pipe and soil interaction are included in a simplified manner. The model comprises of static and dynamic analysis parts. The static analysis captures the in-place configuration and the functional loads. The dynamic analysis is a restart with inherited stress state from static analysis. The impact impulse was applied by point loads in a certain time range. The nonlinear soil stiffness was approached by spring elements (compression only). The dynamic analysis was done in a longer time, ensuring to capture any dynamic effects. The interface loads at the riser stick-out and riser anchor are both extracted and discussed. It is shown that present structure design can withstand the dropped loads at the input energy level.

Impact behaviour of elastoplastic spheres with a rigid wall

2000 ◽  
Vol 214 (8) ◽  
pp. 1107-1114 ◽  
Author(s):  
L-Y Li ◽  
C Thornton ◽  
C-Y Wu
Keyword(s):  
Contact Force ◽  
Numerical Study ◽  
Rigid Wall ◽  
Coefficient Of Restitution ◽  
Two Dimensional ◽  
Material Behaviour ◽  
Normal Impact ◽  
Dimensional Finite Element ◽  
The Impact ◽  
Force Displacement

The paper presents a numerical study of the normal impact of elastoplastic spheres with a rigid wall. The analysis is performed by employing DYNA2D, a non-linear, explicit, two-dimensional finite element (FE) code for impact mechanics. Deformations, time evolution of the contact force and contact force-displacement relationships during the impact are presented. Influences of material behaviour are discussed and their effect on the coefficient of restitution is also demonstrated.

Rounded Square Ring Resonator Based Add Drop Filter for Wdm Applications Using Two Dimensional Photonic Crystals

2021 ◽  
Author(s):  
Massoudi Radhouene ◽  
V R Balaji ◽  
Monia Najjar ◽  
S Robinson ◽  
Vijay Janyani ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Quality Factor ◽  
Wavelength Division Multiplexing ◽  
Ring Resonator ◽  
Filter Design ◽  
Structural Parameters ◽  
Transmission Efficiency ◽  
Square Lattice ◽  
Two Dimensional ◽  
The Impact

Abstract In this paper, two dimensional photonic crystal based Add Drop filter is designed for DWDM applications. The existing work concentrate in Coarse Wavelength Division Multiplexing (CWDM) and few filter design with DWDM with non-uniform channel spacing, and low quality factor. . The proposed Add Drop Filter (ADF) enhances the quality factor using Rounded Square Ring Resonator (RSRR) for ensuring efficient bandwidth in supporting WDM systems. The design consists of bus waveguide, drop waveguide and RSRR with inner quasi-square ring in the square lattice while dielectric constant of the Si rod is 11.68 which are hosted in the air. The line defect was created by removing 4 rods (Quasi ring) in the center of the inner square ring. The line defects in the cavity help to reduce the radiation field components surrounded by the resonator. The proposed design drops the unique wavelength 1636.2 nm from a spectrum. The performance parameters of ADF are investigated using 2D Finite Difference Time Domain (FDTD) algorithm. The proposed ADF drops the narrow bandwidth of 0.7 nm, high quality factor of 2337, dropping efficiency (ON State) of 100 %, which is highly sufficient to support WDM systems for future Photonic Integrated Circuits (PIC). Further, the impact of functional parameters such as transmission efficiency, quality factor, bandwidth are investigated by varying the structural parameters, namely, adjacent rod radius, scatterer rod radius, coupling rod radius, lattice constant, inner rod radius and rod radius. The size of the device is 412.76 µm2.

Numerical Study of the Impact of Manifold and Microchannel Geometry on Flow Uniformity and Pressure Characteristics Within a Parallel Microchannel Array

2012 ◽  
Author(s):  
Mahshid Mohammadi ◽  
Kendra Sharp ◽  
Goran Jovanovic ◽  
Brian Paul
Keyword(s):  
Heat Exchangers ◽  
Numerical Study ◽  
Structural Parameters ◽  
Effective Diffusion ◽  
Flow Distribution ◽  
Number System ◽  
Dead Volume ◽  
Flow Uniformity ◽  
Microchannel Array ◽  
The Impact

Flow uniformity between individual channels within a microchannel array can be a significant factor affecting the performance of laminated-sheet chemical microreactors and micro-heat exchangers. Small dead volume and low residence time through the manifold are also typically favorable in these applications. In the specific application where mass transfer is desired between membrane-separated layers of microchannels, the use of shallow microchannels is important for achieving effective diffusion but negatively impacts the flow distribution among the channels. However, by implementing a thoughtful manifold design the manifold volume can be minimized while maintaining flow uniformity. In this study, numerical modeling is used to quantitatively investigate the impact of the geometry of the manifold and the structural parameters of the microchannels on desired uniformity and pressure drop within the low-Reynolds number system. The CFD tool COMSOL is used for the simulations.

On the Impact of Anthropogenic Heat Fluxes on the Urban Boundary Layer: A Two-Dimensional Numerical Study

2010 ◽  
Vol 136 (1) ◽  
pp. 105-127 ◽  
Author(s):  
Andrea Krpo ◽  
Francisco Salamanca ◽  
Alberto Martilli ◽  
Alain Clappier
Keyword(s):  
Boundary Layer ◽  
Numerical Study ◽  
Urban Boundary Layer ◽  
Heat Fluxes ◽  
Anthropogenic Heat ◽  
Two Dimensional ◽  
The Impact

An Experimental and Numerical Study of Elastic Strain Waves on the Center Line of a 6061-T6 Aluminum Bar

1972 ◽  
Vol 39 (2) ◽  
pp. 367-371 ◽  
Author(s):  
J. L. Habberstad ◽  
K. G. Hoge ◽  
J. E. Foster
Keyword(s):  
Experimental Data ◽  
Outer Surface ◽  
Elastic Strain ◽  
Numerical Study ◽  
Experimental Results ◽  
Center Line ◽  
Two Dimensional ◽  
Strain Gages ◽  
Strain Waves ◽  
The Impact

The elastic strain waves resulting from the impact of two 3/4-in-dia 6061-T6 aluminum bars are studied experimentally and analytically. Experimental data are obtained from strain gages on the center line and outer surface of the bar, located at various distances from the impact end of the bar. Experimental data are compared to numerical results obtained from integrating the exact equations of two-dimensional motion. In general, agreement between the numerical and experimental results is very good.

Dynamic Analysis and Structure Parameters Optimization of a Parallel Platform Based on ADAMS

2013 ◽  
Vol 289 ◽  
pp. 69-74
Author(s):  
Ying Pin Wang ◽  
Ji Min Liang ◽  
Xue Feng Zhou ◽  
Gong Zhang ◽  
Xian Shuai Chen
Keyword(s):  
Dynamic Analysis ◽  
Structural Parameters ◽  
Control Design ◽  
Parameters Optimization ◽  
Optimization Approach ◽  
Linear Motors ◽  
Parameterized Modeling ◽  
Parallel Platform ◽  
And Control ◽  
The Impact

The dynamic analysis and structural parameters optimization approach based on ADAMS for a parallel platform is presented in this paper. Firstly the parameterized modeling of the parallel platform is performed, which is composed of up and down platform, two linear motors and one support beam. And then the impact of the parameters on the performance of the platform is studied. After that the parallel platform is optimized via the optimization module of the ADAMS. Eventually the conclusions are obtained, which provide the guidance for the mechanical and control design of the parallel platform.

Sign in / Sign up

Export Citation Format

Share Document