Viscoelastic Analysis of Full-Scale Pavements: Validation of VEROAD

1996 ◽  
Vol 1539 (1) ◽  
pp. 81-87 ◽  
Author(s):  
R. N. Nilsson ◽  
I. Oost ◽  
P. C. Hopman
Keyword(s):  
The Netherlands ◽  
Computer Program ◽  
Building Materials ◽  
Full Scale ◽  
Road Building ◽  
The Road ◽  
Viscoelastic Analysis ◽  
Viscoelastic Strain ◽  
Linear Viscoelastic ◽  
Full Scale Tests

VEROAD, a linear viscoelastic multilayer computer program, takes the time dependence of road building materials into consideration. VEROAD calculates the responses (displacements, stresses, and strains) of a pavement structure subjected to a moving, sliding load. The validation of VEROAD (for longitudinal and transversal strain results) is described. The calculated strains were compared with measured strains from two full-scale pavement tests: the road track machine test in Denmark and the linear tracking apparatus test in the Netherlands. Measurements from these tests indicate distinct viscoelastic strain curves, that is, time retardation and asymmetry. The study indicates that VEROAD is able to calculate the pavement behavior (both longitudinal and transversal strains) as it was measured in these two full-scale tests. VEROAD-calculated strain curves have the same shape as the measured curves.

Automated design of high voltage pylons

2021 ◽  
Author(s):  
Jos de Bruijn ◽  
Sander van Alphen
Keyword(s):  
The Netherlands ◽  
Automated Design ◽  
Full Scale ◽  
Energy Resources ◽  
Power Lines ◽  
3D Fem ◽  
Steel Tubes ◽  
The World ◽  
New Energy ◽  
Full Scale Tests

<p>As new energy resources like solar, wind and hydropower are being used more and more over the world, the demand for transport of energy and with that the demand for powerlines is big. Also, in The Netherlands this is the case. TenneT (company responsible for the transport of energy in The Netherlands) had to realise a total of 75 km’s of power lines in one project called Wintrack II. This includes 41 different kind of pole types that carry the conductors. The conductors are carried by so called bipoles, these are conical steel tubes.‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌‌</p><p>To help TenneT a semi-automatic tooling was made to calculate and to model the different pole types. The poles are modelled with inventor and calculated with different software programs.</p><p>To validate the different calculations and used model’s 3D FEM-calculations are performed as well as full scale tests. Several kinds of calculations and designs are made, especially in steel and concrete. For example, calculations are made on vortex, prestressing of anchors, flange connections and next to that measurements are being performed on full scale poles.</p>

Utilization of Hydrolysis Lignin in Compositions Soil-Cements

2019 ◽  
Vol 23 (11) ◽  
pp. 32-37
Author(s):  
N.A. Konovalova ◽  
O.N. Dabizha ◽  
P.P. Pankov ◽  
E.A. Rush
Keyword(s):  
Portland Cement ◽  
Model Experiment ◽  
Building Materials ◽  
Raw Materials ◽  
Hydrolysis Lignin ◽  
X Ray ◽  
Road Building ◽  
The Road ◽  
Hydrolyzed Lignin ◽  
Scanning Electron

The article investigated the compositions of road-building materials containing screenings of rock crushing, Portland cement, hydrolyzed lignin, modified by the stabilizing additive “Element”. The road-building compositions containing screenings of rock crushing, Portland cement, hydrolyzed lignin modified with the stabilizing additive "Element" were investigated. The optimal content of raw materials has been established, which allows to obtain soil-cements with a strength mark of at least M 60 - M 75. Using a model experiment, it was shown that the stabilizing additive “Element” is active and can interact with each of component of the raw materials. Using the methods of scanning electron microscopy, infrared spectroscopy, X-ray phase analysis, it has been experimentally shown that the processes of hydration, carbonization and increasing the connectivity of orthosilicate anions play a significant role in the structure formation of soil-cements.

scholarly journals Choice of road building technology - statistic analyses with the use of the Hellwig method

2018 ◽  
Vol 45 ◽  
pp. 00081 ◽  
Author(s):  
Izabela Skrzypczak ◽  
Wojciech Radwański ◽  
Tomasz Pytlowany
Keyword(s):  
Building Materials ◽  
Asphalt Pavement ◽  
Road Construction ◽  
Concrete Pavements ◽  
Pavement Maintenance ◽  
Road Building ◽  
The Road ◽  
Building Technology ◽  
Advantages And Disadvantages ◽  
The Moment

There are two technologies for road construction, e.g. an asphalt one and a concrete one, that exist in the market of road infrastructure at the moment and they both have their advantages and disadvantages [prof Jan Deja of Krakow Mining Academy, Cathedral of Building Materials Technology].The advantage of concrete pavement consists of the fact that it doesn’t require bigger financial expenditures within 10 – 20 years of exploitation (provided that necessary pavement maintenance treatments are carried out). In the case of asphalt pavement it is necessary to mill the wear off layer of the road already after 6-7 years. It leads to the question: which of these technologies should be chosen, which is better? The work hereby carries on analyses concerning a comparison of the technologies for road constructions; the asphalt one and the concrete one. Based on the analyses carried out with the use of the Hellwig method it was found that the achieved values of synthetic meters for asphalt and concrete pavements are close to each other, which may indicate that both technologies are comparable within the sectors taken for analyses in relation to accepted technological-technical and usability features.

Theoretical Road Damage Due to Dynamic Tyre Forces of Heavy Vehicles Part 1: Dynamic Analysis of Vehicles and Road Surfaces

1988 ◽  
Vol 202 (2) ◽  
pp. 103-108 ◽  
Author(s):  
D Cebon
Keyword(s):  
Dynamic Response ◽  
Dynamic Analysis ◽  
Full Scale ◽  
Heavy Vehicles ◽  
Road Vehicles ◽  
Vehicle Simulation ◽  
The Road ◽  
Road Surfaces ◽  
Full Scale Tests

Theory is presented for simulating the dynamic wheel forces generated by heavy road vehicles and the resulting dynamic response of road surfaces to these loads. Sample calculations are provided and the vehicle simulation is validated with data from full-scale tests. The methods are used in the accompanying paper to simulate the road damage done by a tandem-axle vehicle.

A geosynthetic reinforcement solution to prevent the formation of localized sinkholes

2000 ◽  
Vol 37 (5) ◽  
pp. 987-999 ◽  
Author(s):  
P Villard ◽  
J P Gourc ◽  
H Giraud
Keyword(s):  
Surface Deformation ◽  
Numerical Study ◽  
Three Dimensional ◽  
Full Scale ◽  
Geosynthetic Reinforcement ◽  
The Road ◽  
Railway Line ◽  
Collapse Mechanisms ◽  
Full Scale Tests ◽  
Three Dimensional Finite Element

To prevent the appearance of localized sinkholes under roads and railway lines in areas at risk, a research program testing a geosynthetic reinforcement solution was carried out by a group of laboratories. The aim of the reinforcement is to limit surface deformation after the appearance of a sinkhole by making the surface settlement as compatible as possible with the geometrical safety criteria of the road or railway line until earth filling and repair works can be scheduled. Full-scale tests were carried out on reinforced, instrumented road and railway structures subjected to localized collapse. At the same time, a numerical study was carried out to gain a better understanding of the mechanisms involved (arch effect, membrane effect, and collapse mechanisms). The experimental results of the full-scale tests were analyzed and compared with the results of three-dimensional finite element modeling.Key words: localized sinkhole, karstic cavity, reinforcement, geosynthetic.

Building Mulholland Highway: The Road to Mulholland Drive

2017 ◽  
Vol 99 (2) ◽  
pp. 184-226
Author(s):  
Barry Read
Keyword(s):  
Problem Solving ◽  
Road Building ◽  
The Road ◽  
Building Technology ◽  
One Year ◽  
Mulholland Drive

A sequel to the author’s article in the preceding issue on the origins, purpose, and planners of Los Angeles’s scenic Mulholland Drive, this article traces the phenomenal accomplishment of the 24-mile mountain road’s construction in one year and under budget. It details the supervision and problem-solving by construction engineer DeWitt L. Reaburn, the bureaucratic streamlining, the use of the latest 1920s road-building technology, and the efficient manpower logistics that made this possible.

Investigation of planing craft maneuverability using full-scale tests

2021 ◽  
pp. 147509022110303
Author(s):  
Kazem Sadati ◽  
Hamid Zeraatgar ◽  
Aliasghar Moghaddas
Keyword(s):  
Full Scale ◽  
Performance Characteristics ◽  
Forward Speed ◽  
Speed Reduction ◽  
Planing Craft ◽  
Full Scale Tests ◽  
Turning Maneuver

Maneuverability of planing craft is a complicated hydrodynamic subject that needs more studies to comprehend its characteristics. Planing craft drivers follow a common practice for maneuver of the craft that is fundamentally different from ship’s standards. In situ full-scale tests are normally necessary to understand the maneuverability characteristics of planing craft. In this paper, a study has been conducted to illustrate maneuverability characteristics of planing craft by full-scale tests. Accelerating and turning maneuver tests are conducted on two cases at different forward speeds and rudder angles. In each test, dynamic trim, trajectory, speed, roll of the craft are recorded. The tests are performed in planing mode, semi-planing mode, and transition between planing mode to semi-planing mode to study the effects of the craft forward speed and consequently running attitude on the maneuverability. Analysis of the data reveals that the Steady Turning Diameter (STD) of the planing craft may be as large as 40 L, while it rarely goes beyond 5 L for ships. Results also show that a turning maneuver starting at planing mode might end in semi-planing mode. This transition can remarkably improve the performance characteristics of the planing craft’s maneuverability. Therefore, an alternative practice is proposed instead of the classic turning maneuver. In this practice, the craft traveling in the planing mode is transitioned to the semi-planing mode by forward speed reduction first, and then the turning maneuver is executed.

Sign in / Sign up

Export Citation Format

Share Document