Static and dynamic behaviour of a hybrid PFRP-aluminium space truss girder: Experimental and numerical study

2020 ◽  
Vol 243 ◽  
pp. 112226 ◽  
Author(s):  
Ruijie Zhu ◽  
Feng Li ◽  
Fei Shao ◽  
Dongdong Zhang
Keyword(s):  
Dynamic Behaviour ◽  
Numerical Study ◽  
Space Truss

Nonlinear dynamic behaviour of guy cables in turbulent winds

2001 ◽  
Vol 28 (1) ◽  
pp. 98-110 ◽  
Author(s):  
Bruce F Sparling ◽  
Alan G Davenport
Keyword(s):  
Finite Element ◽  
Dynamic Behaviour ◽  
Aerodynamic Drag ◽  
Numerical Study ◽  
Horizontal Displacement ◽  
Wind Loading ◽  
Second Phase ◽  
Nonlinear Coupling ◽  
Wide Range ◽  
Cable Vibrations

Large amplitude cable vibrations are difficult to predict using linear theory due to the presence of sag in the suspended profile. A numerical study was therefore undertaken to investigate the dynamic behaviour of inclined cables excited by imposed displacements. To model the nonlinear nature of cable response, a time domain finite element approach was adopted using nonlinear catenary cable elements. Two types of horizontal displacement patterns were enforced at the upper end of the guy. In the first phase of the study, harmonic displacement histories with a wide range of forcing frequencies were considered. In the second phase, random enforced displacements were used to simulate the motion of a guyed mast in gusty winds. The influence of aerodynamic drag and damping forces was investigated by performing analyses under still air, steady wind, and turbulent wind conditions. It was found that nonlinear coupling of related harmonic response components was significant at certain critical frequencies, particular when the excitation was harmonic and acted in the plane of the guy. Positive aerodynamic damping was shown to effectively suppress resonant and nonlinear coupling response.Key words: cables, structural dynamics, wind loading, finite element method, nonlinear analysis, guyed towers.

scholarly journals Numerical study on the influence of acoustic natural frequencies on the dynamic behaviour of submerged and confined disk-like structures

2017 ◽  
Vol 73 ◽  
pp. 53-69 ◽  
Author(s):  
Matias Bossio ◽  
David Valentín ◽  
Alexandre Presas ◽  
David Ramos Martin ◽  
Eduard Egusquiza ◽  
...  
Keyword(s):  
Dynamic Behaviour ◽  
Natural Frequencies ◽  
Numerical Study

A numerical study on the influences of underlying soil and backfill characteristics on the dynamic behaviour of typical integral bridges

Bauingenieur ◽  
2020 ◽  
Vol 95 (11) ◽  
pp. S 2-S 11
Author(s):  
H. D. B. Aji ◽  
M. B. Basnet ◽  
Frank Wuttke
Keyword(s):  
Soil Structure ◽  
Dynamic Behaviour ◽  
Numerical Study ◽  
Coupled System ◽  
Soil Structure Interaction ◽  
Dynamic Resistance ◽  
Soil Characteristic ◽  
Structure Interaction ◽  
Integral Bridges ◽  
Underlying Soil

Abstract The identification of the dynamic behaviour of a structure is one of the crucial steps in the design of the dynamic resistance of the structure. The dynamic behaviour is represented by the natural frequencies and damping which are subsequently used along with the considered dynamic actions in the design process. In regard of integral bridge concept, one of the consequences of the omission of joints and bearings is the substantial soil-structure interaction which in turn increases the sensitivity of the dynamic behaviour of the bridges to the surrounding soil characteristic. In this article, we extended our hybrid BEM-FEM steady-state dynamic numerical tool to the 3D regime, developed by utilizing an in-house BEM and the commercial FEM software ABAQUS and use it to analyse the dynamic interaction between the bridge and the underlying soil as well as the backfill. The numerical results from four typical integral bridges show that underlying soil characteristic has great effect on the resonant frequencies and the damping. The backfill material properties tend to have less significant role due to the abutment wingwalls dominating the force transfer between the soil and the superstructure. The results also show that the degree of influence of the soil-structure interaction on the coupled system is affected by the type of load pattern in addition to the flexural stiffness of the superstructure.

scholarly journals Experimental and Numerical Study for the Shaping Formation of SCST Structures by Cable-tensioning

2013 ◽  
Vol 7 (1) ◽  
pp. 77-83
Author(s):  
J.W. Kim ◽  
J. H. Doh ◽  
S. Fragomeni
Keyword(s):  
Numerical Study ◽  
Geometric Model ◽  
Small Scale ◽  
Element Analysis ◽  
Construction Technique ◽  
Construction Methods ◽  
Space Truss ◽  
Test Models ◽  
Scale Test ◽  
Joint Behaviour

This paper discusses the behaviour characteristics of the shaping formation of Single-Chorded Space Truss (SCST) structures by means of cable-tensioning of bottom chords. The innovative technique is fast and economical and issued in many types of space structures. The small-scale test models presented herein consist of uniform pyramids with multi-directional ball type joints which are erected into their final shape by cable-tensioning. Since the joint behaviour is very significant in studying the shaping of SCST structures, basic tests for beam and pyramidal units were performed. The feasibility of the proposed cable-tensioning technique and the reliability of the established geometric model were confirmed by finite element analysis. The proposed cable-tensioning technique indicates that the behaviour characteristic of joints is very important in the shaping formation of SCST structures. More specifically in situations where heavy cranes are inaccessible, the cable-tensioning construction technique has proven to be an easy and reasonable method compared to conventional construction methods that typically include heavy cranes and scaffolding.

Numerical Study of Dynamic Crack of 1D Hexagonal and 3D Icosahedral Quasicrystals

2013 ◽  
Vol 734-737 ◽  
pp. 2306-2309
Author(s):  
Li Ping Du ◽  
Xiu Juan Xu ◽  
Yi Li Tan
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Dynamic Stress ◽  
Dynamic Behaviour ◽  
Numerical Study ◽  
Dynamic Stress Intensity Factor ◽  
Dynamic Equations ◽  
Dynamic Crack ◽  
Icosahedral Quasicrystals

According to a new version of equations of elasodynamics of quasicrystals suggested by Ref, a finite difference method of the anti-plane elastic dynamic equations of 1D hexagonal and 3D icosahedral quasicrystals is developed. Further the dynamic behaviour of the material with a model III crack under impact loading is given.The results show dynamic stress intensity factor of the crack tip, in which the similar and different features with conventional materials are discussed, especially the phonon,phason and phonon-phason coupling effects are explored.

Torsional behavior of a hybrid FRP-aluminum space truss bridge: Experimental and numerical study

2018 ◽  
Vol 157 ◽  
pp. 132-143 ◽  
Author(s):  
Dongdong Zhang ◽  
Qilin Zhao ◽  
Feng Li ◽  
Jie Tao ◽  
Yifeng Gao
Keyword(s):  
Numerical Study ◽  
Space Truss ◽  
Torsional Behavior ◽  
Truss Bridge

Sensitivity of Space Trusses to Sudden Member Loss

1997 ◽  
Vol 12 (1) ◽  
pp. 31-41 ◽  
Author(s):  
Ahmed El-Sheikh
Keyword(s):  
Aspect Ratio ◽  
Numerical Study ◽  
Concrete Slab ◽  
Severe Damage ◽  
Composite Action ◽  
Space Truss ◽  
Supporting Condition ◽  
High Degree ◽  
Space Trusses

Space trusses typically contain a large number of members, and possess a high degree of statical indeterminacy. However, a number of members have been identified as critical to truss integrity, with the loss of any of them likely to produce serious strength reductions. Furthermore, when these members are lost suddenly, e.g. due to the failure of a faulty connection or the buckling of a slender member, their forces are shed into the structure in a dynamic manner, leading to yet more severe damage. This paper presents a numerical study on the sensitivity of space trusses to both gradual and sudden member losses. The effect of composite action between a top concrete slab and a space truss in reducing this sensitivity is assessed. Other factors that are also considered in this work include the truss aspect ratio and supporting condition.

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