scholarly journals Dynamic Stiffness Identification of Portal Frame Bridge–Soil System using Controlled Dynamic Testing

2017 ◽  
Vol 199 ◽  
pp. 1062-1067 ◽  
Author(s):  
Abbas Zangeneh ◽  
Christoffer Svedholm ◽  
Andreas Andersson ◽  
Costin Pacoste ◽  
Raid Karoumi
Keyword(s):  
Dynamic Testing ◽  
Dynamic Stiffness ◽  
Soil System ◽  
Stiffness Identification ◽  
Portal Frame

A hybrid method for dynamic stiffness identification of bearing joint of high speed spindles

2016 ◽  
Vol 57 (1) ◽  
pp. 141-159 ◽  
Author(s):  
Yongsheng Zhao ◽  
Bingbing Zhang ◽  
Guoping An ◽  
Zhifeng Liu ◽  
Ligang Cai
Keyword(s):  
Hybrid Method ◽  
High Speed ◽  
Dynamic Stiffness ◽  
Stiffness Identification

Seismic Response Characteristics of a Piled Raft in Clay

2019 ◽  
Vol 13 (01) ◽  
pp. 1950005 ◽  
Author(s):  
Ramon Varghese ◽  
A. Boominathan ◽  
Subhadeep Banerjee
Keyword(s):  
Seismic Response ◽  
Shaking Table Test ◽  
Interaction Analysis ◽  
Dynamic Stiffness ◽  
Shaking Table ◽  
Dimensionless Frequency ◽  
Soil System ◽  
Pile Spacing ◽  
Piled Raft ◽  
Axial Forces

This paper presents a study on three-dimensional seismic soil–structure interaction analysis of a piled-raft (PR) foundation in clay by the substructure approach. Two different pile modeling techniques were adopted and compared with centrifuge shaking table test results reported in the literature. The effect of pile spacing on dynamic impedances, kinematic response parameters, axial pile forces and bending moments of PRs is studied. It is found that the presence of a rigid raft on a pile group results in significant variation in vertical and horizontal dynamic stiffness after a dimensionless frequency ([Formula: see text] value of around 0.22. The influence of raft on kinematic response parameters at the top of raft is found to be significantly influenced by pile spacing beyond a dimensionless frequency ([Formula: see text] value of 0.4. The axial forces generated at the pile heads of a PR–structure system during seismic shaking are quantified using a new dimensionless factor, and are found to be significantly influenced by the pile spacing. Pile layout in the PR system is found to play an influential role in seismic response as well as pile bending moment for a structure–PR–soil system studied.

Identification of soil-structure interaction effect in a portal frame railway bridge through full-scale dynamic testing

2018 ◽  
Vol 159 ◽  
pp. 299-309 ◽  
Author(s):  
Abbas Zangeneh ◽  
Christoffer Svedholm ◽  
Andreas Andersson ◽  
Costin Pacoste ◽  
Raid Karoumi
Keyword(s):  
Interaction Effect ◽  
Soil Structure ◽  
Dynamic Testing ◽  
Full Scale ◽  
Soil Structure Interaction ◽  
Railway Bridge ◽  
Structure Interaction ◽  
Portal Frame

Dynamic Stiffness Identification of Bolted Joints

2011 ◽  
Vol 291-294 ◽  
pp. 1582-1588
Author(s):  
Tie Neng Guo ◽  
Bin Song ◽  
Dong Liang Guo ◽  
Zhong Qing Chen
Keyword(s):  
Dynamic Characteristic ◽  
Dynamic Stiffness ◽  
Dynamic Parameter ◽  
High Accuracy ◽  
Bolted Joints ◽  
Small Discrepancy ◽  
Identification Method ◽  
Stiffness Identification ◽  
Accuracy Result ◽  
The Relationship

The joint has a significant effect on the dynamic characteristic of the mechanism, and the identification of the stiffness of the joints has become a key problem. In this paper, a method is presented for identifying the dynamic characteristic of joints. An experiment is designed to test the dynamic parameter of the bolted joints specimen; the identification method, based on experiment, has a high accuracy result. By taking a specimen to experiment and identify the dynamic characteristic of joints, the relationship between the preload on the bolts and the joints stiffness is acquired. In order to validate the accuracy of the result, the FEM software is used to simulate. There are only a small discrepancy between the results of identification and simulation.

scholarly journals Mechanical and Dynamic Characterization of Sustainable Composites Based on Food Packaging Waste

2018 ◽  
Vol 249 ◽  
pp. 01002
Author(s):  
M G Nassef ◽  
I El-Galy ◽  
A Hassanin
Keyword(s):  
Glass Fiber ◽  
Composite Structures ◽  
Food Packaging ◽  
Dynamic Testing ◽  
Dynamic Stiffness ◽  
Damping Ratio ◽  
Medium Density Fiberboard ◽  
Modulus Of Rupture ◽  
Packaging Waste ◽  
Woven Glass Fiber

Composites made from food packaging waste are recently introduced to the industry as promising materials that aim to reduce the environmental waste and to develop cost effective products. They possess good physical properties, which makes them potential competitors to wood based composite structures such as commercial particleboard (PB), and medium density fiberboard (MDF). Despite the expected advantages, the mechanical and dynamic behaviour of this genuine structure still needs to be studied and tested to evaluate its suitability for light weight structure applications. Experimental modal analysis is conducted on specimens made of food packaging waste, sandwich structured packaging waste with woven glass-fiber skin, MDF and PB. The dynamic testing results show superior damping ratio for the food packaging waste composites compared to the wood-based specimens. Natural frequencies exhibit comparable dynamic stiffness with respect to MDF, and PB. Further investigation has been made to evaluate both the modulus of rapture and the static stiffness of the material by conducting flexural tests on all specimens. Sandwich structure produced from food packaging waste and veneered with woven glass-fiber fabric exhibit excellent magnitudes for the modulus of rupture in addition the highest damping ratio.

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