Investigation on Mechanical Behavior of Hydrological Tower

2011 ◽  
Vol 243-249 ◽  
pp. 4524-4527
Author(s):  
Hui Xiong ◽  
Zheng Liang Li ◽  
Nuan Deng
Keyword(s):  
Finite Element ◽  
Composite Structure ◽  
Mechanical Characteristics ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Element Model ◽  
Finite Element Program ◽  
Safety And Reliability ◽  
Element Program ◽  
Static Performance

The safety and reliability of hydrological tower play an important role in the security and accuracy of the hydrological measurement. In order to simulate the space mechanical characteristics of the composite structure of tower with guy lines accurately, the finite element program is used to establish a precise three dimensional space finite element model. The structural strength and stability was also analyzed. Meanwhile, the static performance and vibration characteristics of the tower with guy lines was compared with the ones of the tower with none guy lines. The results show that the mechanical characteristics of composite structure are similar to the ones of continuous beams with lateral bearing spring. The guy lines rationalize the force distribution on structures, enhance the structural bearing capacity, and increase the structural stiffness. In addition, the paper can be a reference for the analysis of hydrological towers in aspects of numerical analysis, design methods and data.

Static and Dynamic Analyses of the LSES Hull Structure

1978 ◽  
Vol 22 (02) ◽  
pp. 110-122
Author(s):  
A. S. Hananel ◽  
E. J. Dent ◽  
E. J. Philips ◽  
S. H. Chang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Surface Effect ◽  
Three Dimensional ◽  
Element Model ◽  
Finite Element Program ◽  
Hull Structure ◽  
Surface Effect Ship ◽  
Hull Design ◽  
Element Program

To avoid the conservativeness in the large surface-effect ship hull design which results from simplifying assumptions in the stress analysis, the hull structure was analyzed as a three-dimensional elastic body. The NASTRAN finite-element program, level 15.0, was selected for use in this analysis as the most suitable program available. A finite-element model representing the true hull stiffness was used in obtaining the internal load and displacement distributions. The inertia effect of the ship masses was included with each set of static loads. This was done by using the Static Analysis with Inertia Relief solution included in NASTRAN. The stress redistribution around cutouts in the hull was treated in a separate study. The interaction between hull and deckhouse was investigated by attaching a model of the deckhouse onto the hull model, and then solving for the appropriate load conditions. The natural frequencies were obtained using a reduced finite-element model of both the hull and hull/deckhouse combination. A new technique was developed for determining the dynamic stresses and their proper superposition on the static stresses.

scholarly journals Dynamic Response Of Concrete Rectangular Liquid Tanks In Three-Dimensional Space

2021 ◽  
Author(s):  
Ima T. Avval
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Ground Motion ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Liquid System ◽  
Finite Element Program ◽  
Tank System ◽  
Element Program ◽  
Parametric Studies

The effect of three-dimensional geometry on the seismic response of open-top rectangular concrete water tanks is investigated. In this study, the fluid-structure interaction is introduced incorporating wall flexibility. Numerical studies are done based on finite element simulation of the tank-liquid system. The ANSYS finite element program is used. The liquid-tank system is modelled assuming both 2D and 3D geometries. Parametric studies are conducted to investigate the effect of water level, tank plan dimensions and the nature of the ground motion on the dynamic response. Due to three-dimensional geometry, amplification of the dynamic response in the form of sloshing height, hydrodynamic pressures and resultant forces is observed. The results show that, at the corner of the tanks, the interaction of the waves generated in longitudinal and transverse directions initiates greater wave amplitude. Sensitivity of the sloshing response of the tank to the frequency content of the ground motion is observed.

scholarly journals Dynamic Response Of Concrete Rectangular Liquid Tanks In Three-Dimensional Space

2021 ◽  
Author(s):  
Ima T. Avval
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Ground Motion ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Liquid System ◽  
Finite Element Program ◽  
Tank System ◽  
Element Program ◽  
Parametric Studies

The effect of three-dimensional geometry on the seismic response of open-top rectangular concrete water tanks is investigated. In this study, the fluid-structure interaction is introduced incorporating wall flexibility. Numerical studies are done based on finite element simulation of the tank-liquid system. The ANSYS finite element program is used. The liquid-tank system is modelled assuming both 2D and 3D geometries. Parametric studies are conducted to investigate the effect of water level, tank plan dimensions and the nature of the ground motion on the dynamic response. Due to three-dimensional geometry, amplification of the dynamic response in the form of sloshing height, hydrodynamic pressures and resultant forces is observed. The results show that, at the corner of the tanks, the interaction of the waves generated in longitudinal and transverse directions initiates greater wave amplitude. Sensitivity of the sloshing response of the tank to the frequency content of the ground motion is observed.

Finite Element Modeling for RC Hollow Columns Wrapped with FRP Laminates

2011 ◽  
Vol 71-78 ◽  
pp. 3347-3353 ◽  
Author(s):  
Ashraf Mohamed Mahmoud
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Concrete Element ◽  
Finite Element Program ◽  
Element Program ◽  
Failure Loads ◽  
Brick Element ◽  
Element Type ◽  
Orthotropic Properties

A finite element reinforced concrete model has been analyzed by the author with Ansys v.9 finite element program for both unstrengthened and CFRP-strengthened hollow columns using solid65 concrete element, its size 24x26x24 mm and Link8 discrete steel distribution element. The CFRP has been modeled using Solid46 element, which has orthotropic properties. The deflection results have been compared with an experimental and other finite element model which are performed by Lignola [6], in which using Tno Diana v. 9.1 finite element program for modeling concrete using three-dimensional solid brick element type Chx60, steel using embedded reinforcement truss element and CFRP using three-node plane bonded element. These results show that the author's model is much better than the Lignola's [6] model comparing with the experimental one. A parametric study has been done on the proposed model for obtaining the effect of using the GFRP instead of the CFRP in column strengthening by comparing the failure loads and the concrete and steel properties at failure. This study show a reduction in the failure load values by an amount 0.6 to 2.8% when using GFRP, indicating that the CFRP is more preferable in strengthening of the hollow column than the GFRP.

Virtual Testing for Frontal Impact of High-Top Cab of Heavy Truck

2011 ◽  
Vol 148-149 ◽  
pp. 1081-1084
Author(s):  
Wei Wang ◽  
Xu Liang Xie ◽  
Fu Lin Shen ◽  
Xiao Feng Wang
Keyword(s):  
Finite Element ◽  
Element Model ◽  
Front Seat ◽  
Finite Element Program ◽  
Explicit Finite Element ◽  
Commercial Code ◽  
Element Program ◽  
Heavy Truck ◽  
Survival Space ◽  
Pendulum Impact

ECE R29 regulation has legally claimed that the survival space must be guaranteed for the safety for driver and front seat passenger in event of crash during design of truck cabin. In this paper, a finite element model of a high-top cabin of a heavy truck with a manikin on the driver seat was built with commercial code Hypermesh, The explicit finite element program Ls-Dyna was used to simulate the frontal pendulum impact on the high-top cab in the light of ECE R29 regulation. Deformation of the truck cabin and the survival space of the dummy were analyzed and discussed. Also, some suggestions were given to solve the contact possibility between steering column and the knees of manikin.

scholarly journals Evaluation of Strains at the Bottom of the Asphalt Base Layer of a Semi-Rigid Pavement Under a Class 6 Vehicle

2019 ◽  
Vol 271 ◽  
pp. 08008
Author(s):  
Mohsen Talebsafa ◽  
Stefan A. Romanoschi ◽  
Athanassios T. Papagiannakis ◽  
Constantin Popescu
Keyword(s):  
Finite Element ◽  
Longitudinal Direction ◽  
Element Model ◽  
Base Layer ◽  
Rigid Pavement ◽  
Finite Element Program ◽  
Element Program ◽  
Transverse Strains ◽  
Longitudinal Strains ◽  
Good Agreement

A newly constructed pavement on US-287 near Mansfield, TX was instrumented with gauges installed at the bottom of the asphalt concrete base layer to measure the longitudinal and transverse strains developed under a test vehicle. The finite element program Abaqus was used to compute the strains at the location of the gauges; they were found in good agreement with the measured strains. The research showed that the strains under the steering axle were of similar magnitude as the strains under the rear tandem axle. The measured transverse strains were in general slightly bigger than the corresponding longitudinal strains, while the finite element model computed higher strains in the longitudinal direction. These findings suggest the need to account for the strain responses from the steering axle of trucks and to account for both the longitudinal and the transverse strains when computing the fatigue damage induced by trucks.

Stress Analysis of Pin-Loaded Composite Plates

2004 ◽  
Author(s):  
James J.-S. Stone ◽  
Shen-Haw Ju ◽  
Robert E. Rowlands
Keyword(s):  
Finite Element ◽  
Frictional Contact ◽  
Composite Plates ◽  
High Sensitivity ◽  
Element Model ◽  
Bolted Joint ◽  
Numerical Techniques ◽  
Considerable Effort ◽  
Finite Element Program ◽  
Element Program

The frictional contact of the pin-loaded joint in composite plates was studied. This included the effects of pin clearance and variations in material and geometry. Full-filed displacements were measured by high sensitivity moire´ interferometry. Considerable effort was expended to develop a loading frame, relevant fixtures and monitoring capability to ensure that the plate was loaded uniformly through its thickness, particularly at the pin-loaded hole. Numerical techniques were prepared for processing the optical fringe data. A reliable finite element model for a bolted joint was also formulated. The efficient finite element program, which is capable of handling friction and/or clearance at the loaded hole, has been validated analytically, experimentally and numerically.

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