scholarly journals Effect of a dual tire pressure on the design parameters of thick asphalt pavements using finite element freeware

DYNA ◽  
2016 ◽  
Vol 83 (196) ◽  
pp. 194-203
Author(s):  
Myriam Rocío Pallares Muñoz ◽  
Julián Andrés Pulecio-Díaz
Keyword(s):  
Finite Element ◽  
Analytical Methods ◽  
Asphalt Pavement ◽  
Field Tests ◽  
Asphalt Pavements ◽  
Design Parameters ◽  
Future Research ◽  
Tire Pressure ◽  
The Cost ◽  
Cost Of Construction

<p>The effect of a dual tire pressure on the design parameters of thick asphalt pavements using finite element freeware EverStressFE©1.0 is evaluated. This is trying to represent more adjusted the footprint shape and intensity of stress generated by the tires of vehicles. To validate the elastic multilayer EverStress©5.0 software was used. The results of the deformations can be concluded that the asphalt pavement designs made with analytical methods may be slightly oversized and consequently increase the cost of construction of pavements. This study marks a route to analyze the sensitivity of various factors that may affect the design of asphalt pavements. Future research is expected to integrate dynamic conditions by introducing results of field tests to full scale.</p>

scholarly journals Retraction notice to “Effect of a dual tire pressure on the design parameters of thick asphalt pavements using finite element freeware” [DYNA 83(196), pp. 194-203. April, 2016]

DYNA ◽  
2017 ◽  
Vol 84 (202) ◽  
Author(s):  
Centro Editorial Facultad de Minas
Keyword(s):  
Finite Element ◽  
Asphalt Pavements ◽  
Design Parameters ◽  
Tire Pressure ◽  
Retraction Notice

Este artículo ha sido retirado por decisión del Comité Editorial de la Faculltad de Minas, por violación a las Políticas Editoriales de la revista.

Structural Deformation and Stress Analysis of Aircraft Wing by Finite Element Method

2014 ◽  
Vol 906 ◽  
pp. 318-322 ◽  
Author(s):  
M. Fazlay Rabbey ◽  
Anik Mahmood Rumi ◽  
Farhan Hasan Nuri ◽  
Hafez M. Monerujjaman ◽  
M. Mehedi Hassan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Properties ◽  
Structural Deformation ◽  
Design Parameters ◽  
Design Phase ◽  
Aircraft Wing ◽  
Detail Design ◽  
The Cost ◽  
Element Method

Wing of an aircraft is lift producing component. It makes aircraft airborne by generating lift>weight. The wing must take the full aircraft weight during flying. So, it is very sophisticated task for designing a wing by keeping consideration of every design parameters simultaneously. This paper contains analysis of structural properties of wing by using finite element method. For well-organized design all the variables must be considered from the beginning of the design phase. The design phases for aircraft are: conceptual, preliminary and detail design. Until the preliminary design phase the aircraft structure is not considered. During these phases the material of the wing should be selected in such a way so that it can perform efficiently with less unexpected phenomena (drag) for which responsible properties are displacement, stress etc. Currently the most focusing area for the aero-elastic investigation is to design wing with good aerodynamic shape which will associated with less dragging structural behavior. It helps to reduce SFC (Specific Fuel Consumption) and so the cost. The analysis on that has done through Computational means as well as simulation technique to develop knowledge about the variation of aircraft wing structural properties.

Effects of construction cracks on the design of asphalt pavements

1994 ◽  
Vol 21 (3) ◽  
pp. 410-418 ◽  
Author(s):  
A. O. Abd El Halim ◽  
A. G. Razaqpur ◽  
A. H. El Kashef
Keyword(s):  
Finite Element ◽  
Field Tests ◽  
Fatigue Tests ◽  
Asphalt Pavements ◽  
Steel Wheel ◽  
Asphalt Mix ◽  
Pavement Structures ◽  
Stress Fatigue ◽  
Long Term Performance ◽  
Term Performance

Compaction of asphalt mix has been recognized as one of the most important factors that affect the long-term performance of the pavement. Problems experienced in compacting asphalt mixes have generally been ascribed to the mix. Roller "checking," the result of compaction with steel rollers, has been disregarded or considered as irrelevant. Compaction based on a new concept, using a soft plate, avoids roller checking, as demonstrated by a series of side-by-side field tests with steel and pneumatic rollers. The surface cracks initiated by the steel wheel roller may provide an explanation for the often reported phenomenon of early deterioration of asphalt pavements. Finite element analyses of pavement structures with roller-induced cracks have shown significantly higher tensile stresses than the corresponding stresses in otherwise identical uncracked pavements. The analytical findings are supported by indirect tensile and stress fatigue tests results obtained in the laboratory from asphalt samples compacted in the field. The test samples were recovered from pavements compacted either by existing compaction equipment and technique or by the new soft plate method. Key words: asphalt, crack, compaction, fatigue, finite element, tensile strength testing, pavement.

scholarly journals Temperature Adaptability of Asphalt Pavement to High Temperatures and Significant Temperature Differences

2018 ◽  
Vol 2018 ◽  
pp. 1-16
Author(s):  
Xueying Zhao ◽  
Aiqin Shen ◽  
Baofu Ma
Keyword(s):  
Asphalt Pavement ◽  
Maximum Shear Stress ◽  
Structure Design ◽  
Temperature Fields ◽  
Asphalt Pavements ◽  
Fe Model ◽  
Tire Pressure ◽  
Significant Temperature ◽  
Pavement Structure ◽  
Temperature Adaptability

Temperature adaptability of asphalt pavements is very important, due to their potential influence on pavement structure design, particularly in areas that experience significant temperature differences. In this paper, a finite element (FE) model was developed, and Turpan-Xiaocao Lake Highway in southern Xinjiang was taken as a case study engineering, which tends to experience this adverse environmental condition (temperature difference: 25.5°C; July 14, 2008). In this model, the generalized Kelvin model and the Burgers model were used. The time-dependent tire pressure was considered. To guide pavement structure design and control pavement distresses in this area, seven alternative pavement structures were selected to simulate and analyze pavement temperature fields and the mechanical responses. It was observed that the influence of air temperature had the greatest impact on Str-1, possibly due to the thinnest asphalt course. Moreover, when rutting depth, maximum shear stress of the asphalt course, deflection on the pavement surface, and compressive strains at the subgrade top surface were taken as the evaluation indices, the adaptability of asphalt pavements using compound base courses had obvious advantage due to their strong absorption and reflection of load impact. The adaptability of seven structures analyzed in this paper decreased in the following order: Str-5 > Str-6 > Str-4 > Str-2 > Str-m > Str-1 > Str-3. In addition, it broke the traditional view that asphalt pavement with a flexible base had the poor ability on rutting resistance. Besides, it also suggests that when the thickness of asphalt courses was equivalent, increasing the thickness of chemical-treated base courses would help with the deformation resistance, and vice versa.

Choosing The Method Of Construction Of The Underground Part Of The Building

2020 ◽  
pp. 57-61
Keyword(s):  
Design Parameters ◽  
Top Down ◽  
Underground Part ◽  
Construction Methods ◽  
Design Documentation ◽  
Zone Of Influence ◽  
Under Construction ◽  
The Cost ◽  
Cost Of Construction ◽  
Economic Comparison

The main methods of construction of the underground part of buildings are given. It is shown that the choice of the method requires a mandatory technical and economic comparison of various options, since different construction methods can be used for almost any structural scheme of the underground part and under any hydrogeological conditions. An important role in choosing a method is to assess its reliability - ensuring compliance with all design parameters, as well as the integrity of buildings located in the zone of influence. The most serious justification requires the method "Top Down" (top-down), the use of which for some conditions leads to cheaper, but in most cases - to a significant increase in the cost of construction. For comparative analysis, a survey of several objects under construction in Moscow was performed and the design documentation of previously constructed objects using the "Top Down" method was studied. The performed approximate calculations showed that the use of this method leads, as a rule, to a significant increase in the cost of construction of the underground part.

Analysis of Perpetual Asphalt Pavement Response under Heavy Loads in Northeast Area of China

2013 ◽  
Vol 838-841 ◽  
pp. 1203-1215
Author(s):  
Deng Wen Zhou ◽  
Rong Jin Wang
Keyword(s):  
Finite Element ◽  
Contact Area ◽  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
Asphalt Pavements ◽  
Rigid Base ◽  
Characteristic Finite Element ◽  
Pavement Structures ◽  
Heavy Loads ◽  
High Traffic Volume

Severe rutting, cracks and moisture damage are presented on conventional semi-rigid base asphalt pavements not long after completed in China. This phenomenon indicates that conventional philosophy on pavement design could not meet more and more frequent and heavy vehicle. With high structural capacity for high traffic volume and heavy loads, the Perpetual Asphalt Pavements (PAPs) solve those problems well. Meanwhile they need minimal or no major structural rehabilitation and/or reconstruction exercises in their life, which ensures low user-delay. Three PAPs, including semi-rigid base asphalt pavement, flexible base asphalt pavement, and combined base asphalt pavement, are put forward for the northeast area in China considering its climate, traffic characteristic. Finite element method is utilized to analyze response of PAPs under heavy loads. Two key factors, i.e. tensile horizontal strains at the bottom of asphalt layers and compressive vertical strains are investigated. Also the capacities of the structures on bearing overloading are estimated. Four types of wheel and axle, including single axle and single tire, single axle and dual tires, dual axles and dual tires, and tri axles and dual tires are adopted in finite element models. The shapes of tire-pavement contact area are either circular or rectangular to simulate standard load or overloading respectively. When rectangular shapes are adopted, the contact area sizes and the distribution of pressure are varied. Conventional asphalt concrete and high modulus asphalt concrete are adopted. Simulations are done. The competences of the three pavement structures on fulfilling long lives are evaluated.

scholarly journals Application of Linear Viscoelastic Properties in Semianalytical Finite Element Method with Recursive Time Integration to Analyze Asphalt Pavement Structure

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Pengfei Liu ◽  
Qinyan Xing ◽  
Dawei Wang ◽  
Markus Oeser
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Asphalt Pavement ◽  
Time Integration ◽  
Asphalt Mixture ◽  
Small Strain ◽  
Asphalt Pavements ◽  
Computational Time ◽  
Fe Method ◽  
Element Method

Traditionally, asphalt pavements are considered as linear elastic materials in finite element (FE) method to save computational time for engineering design. However, asphalt mixture exhibits linear viscoelasticity at small strain and low temperature. Therefore, the results derived from the elastic analysis will inevitably lead to discrepancies from reality. Currently, several FE programs have already adopted viscoelasticity, but the high hardware demands and long execution times render them suitable primarily for research purposes. Semianalytical finite element method (SAFEM) was proposed to solve the abovementioned problem. The SAFEM is a three-dimensional FE algorithm that only requires a two-dimensional mesh by incorporating the Fourier series in the third dimension, which can significantly reduce the computational time. This paper describes the development of SAFEM to capture the viscoelastic property of asphalt pavements by using a recursive formulation. The formulation is verified by comparison with the commercial FE software ABAQUS. An application example is presented for simulations of creep deformation of the asphalt pavement. The investigation shows that the SAFEM is an efficient tool for pavement engineers to fast and reliably predict asphalt pavement responses; furthermore, the SAFEM provides a flexible, robust platform for the future development in the numerical simulation of asphalt pavements.

scholarly journals Analysis of construction cost prediction studies – global perspective

2019 ◽  
Vol 10 (3) ◽  
pp. 275-281 ◽  
Author(s):  
P. Velumani ◽  
N. V. N. Nampoothiri
Keyword(s):  
Tamil Nadu ◽  
Ease Of Use ◽  
Global Perspective ◽  
Future Research ◽  
Cost Overruns ◽  
Five Factors ◽  
Accuracy Of Results ◽  
The Cost ◽  
Accuracy Of Prediction ◽  
Cost Of Construction

It is well known that the civil engineering constructions are subjected to cost risk and time overruns. The uncertainties of the cost of construction many times result in disputes among stakeholders. The recent cost fluctuation in sand price in Tamil Nadu is a good example of time and cost overruns. There are too many models developed to predict the cost of construction by using different parameters and tools. The objectives of this research are to analyse the importance of research in this field, the countries focusing on this issue, level of implementation by the practicing engineers, the tools often or successfully used, the difficulties in predicting the cost and the accuracy of prediction and bringing out a useful conclusion to provide the direction for future research. In this research, a sample of 324 research papers out of more than 2000 papers listed in Scopus database between the years 1990 and 2015 were considered and analyzed on five factors. The five factors are 1) authors affiliation – academics, industry or both; 2) country; 3) tools used – ANN, regression, time-series models, etc.; 4) complexity involved or ease of use; 5) accuracy of results. The results show interesting information.

Analysis on the Reliability of Asphalt Pavement

2011 ◽  
Vol 243-249 ◽  
pp. 4147-4151 ◽  
Author(s):  
Qing Guo Yang ◽  
Li Yan Dong ◽  
Jin Cheng Ning
Keyword(s):  
Early Stage ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Early Period ◽  
Asphalt Pavements ◽  
Design Parameters ◽  
Construction Process ◽  
Actual Material ◽  
Pavement Damage

The asphalt pavements which are designed for 15-years usage are often highly damaged in the early period. In order to eliminate this phenomenon, researches have been carried out in many aspects, but the situation of asphalt pavement damage cannot be essentially changed. In the view of reliability, the frequent early stage damage phenomenon of asphalt pavements means that nowadays process of asphalt pavements must have not sufficient reliability, and just it leads the asphalt pavements can not reach the design purpose. Based on the basic engineering reliability theory, the reliability of the asphalt pavement design, from the determination of effect actions to selection of material parameters and the calculative model about pavement, has been analyzed; meanwhile the reliability of construction process has been analyzed too. The analysis on the reliability of asphalt pavement shows that the determination of design parameters makes the actual material is weaker than design; the construction process of the asphalt pavement makes the asphalt mixture greatly different anticipations and makes the layer condition deviated the ideal bonding condition. It is just these various uncertainties in design and construction that causes the asphalt pavement damage in early stage. So in order to change the situation of early damage in asphalt pavement, the effective measures are to focus on the reliability of design and constructions.

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