scholarly journals A Comparison between the Empirical and Mechanistic-Empirical Pavement Design Methods

2019 ◽  
Vol 7 (07) ◽  
Author(s):  
Dr. Mohammed Shallal ◽  
Elsir Suliman Ahmed
Keyword(s):  
Comparative Study ◽  
Key Words ◽  
Design Method ◽  
Design Methods ◽  
Pavement Design ◽  
Empirical Methods ◽  
Traffic Loading ◽  
Aashto 1993 ◽  
Empirical Design ◽  
Subgrade Strength

In this paper a comparative study has been carried out between the Mechanistic-Empirical Pavement Design Methods and the Empirical Pavement Design Methods. For the purpose of this paper, nine pavement design sections have been prepared using the Mechanistic-Empirical Methods represented by the Asphalt Institute Design Method (SW-1 software of the Asphalt Institute) and the Empirical Design represented by AASHTO 1993 and TRL Road Note No.31, using the same traffic loading and subgrade strength. Three traffic loading scenarios have been considered for this study. (Key words: Mechanistic-Empirical, Empirical, axle loads, Subgrade Strength, pavement design)

scholarly journals Flexible Pavement Design Suitable for Sudan

2021 ◽  
Vol 9 (3) ◽  
pp. 127-134
Author(s):  
Esra M. O. Mohamed Elsaid ◽  
Awad M. Mohamed
Keyword(s):  
Material Properties ◽  
Design Method ◽  
Pavement Design ◽  
Traffic Load ◽  
Group Index ◽  
Elastic Analysis ◽  
Traffic Loading ◽  
Future Studies ◽  
Design Life ◽  
Design Guide

Pavement design is the process of calculation the thickness of pavement layers which can withstand the expected traffic load over the design life without deteriorating. In another word, it is providing a pavement structure in which stresses on the subgrade are reduced to the acceptable magnitude. Highways in Sudan deteriorate in the first years of construction due to many reasons including the deficiency in pavement design. This research aims to minimize the probability of roads failure by selecting the appropriate pavement design method for Sudan based on the performance evaluation of each method. Various pavement sections with different environment, traffic loading, subgrade and material properties were designed using AASHTO, Road Note 31, Group Index and CBR design method. The layered elastic analysis and the structural number approach were adopted to evaluate the performance of these sections. The evaluation results were the base for selecting of the suitable design method. The evaluation results concludes that, the AASHTO design method is the most suitable design method to withstand pavement deformations followed by Road Note 31 method. But, from economical prospective Road Note 31 method; with some modifications; can be considered as the suitable design method for Sudan. Recommendations for future studies focus on the development and implementation of mechanistic-empirical pavement design guide applicable in Sudan.  

scholarly journals PERANCANGAN PERKERASAN JALAN LINGKAR KOTA KABUPATEN WONOGIRI

Jurnal HPJI ◽  
2019 ◽  
Vol 5 (2) ◽  
pp. 119-128
Author(s):  
Alfiani Yogaturida Isnaini ◽  
Latif Budi Suparma ◽  
Suryo Hapsoro Tri Utomo
Keyword(s):  
Design Method ◽  
Concrete Slab ◽  
Pavement Design ◽  
Slab Thickness ◽  
Ring Road ◽  
Road Pavement ◽  
Road Design ◽  
The Difference ◽  
Aashto 1993 ◽  
Pavement Thickness

Abstract The city ring road of Wonogiri Regency should be constructed based on a pavement design which ensure safety, convenience, but still economical. For this reason, a road pavement design method is needed to be applied in this road design process. The MDP 2017 and AASHTO 1993 road pavement design methods are methods that are often used in Indonesia to design concrete slab for pavement. This study uses both methods to determine the thickness of the concrete slab on the pavement of the Wonogiri Regency City Ring Road. The results of this study indicate that the concrete slab thickness for pavement calculated by MDP 2017 is 31 cm, while that calculated with AASHTO 1993 is 32.25 cm. The difference in the thickness of the concrete plates obtained from these two methods is relatively small. Keywords: road pavement, pavement design, concrete slab, road pavement thickness  Abstrak Jalan lingkar kota Kabupaten Wonogiri harus dibangun berdasarkan rancangan perkerasan jalan yang aman, nyaman, namun tetap ekonomis. Untuk itu, diperlukan suatu metode perancangan perkerasan jalan yang tepat untuk diterapkan pada proses perancangan jalan ini. Metode-metode perancangan perkerasan jalan MDP 2017 dan AASHTO 1993 merupakan metode-metode yang sering digunakan di Indonesia untuk perancangan tebal pelat beton untuk perkerasan jalan. Studi ini menggunakan kedua metode tersebut untuk menentukan tebal pelat beton pada perkerasan jalan lingkar kota Kabupaten Wonogiri. Hasil studi ini menunjukkan bahwa tebal pelat beton untuk perkerasan jalan yang dihitung dengan MDP 2017 adalah 31 cm, sedangkan yang dihitung dengan AASHTO 1993 adalah 32,25 cm. Beda tebal pelat beton yang diperoleh dari kedua metode ini relatif kecil. Kata-kata kunci: perkerasan jalan, perancangan perkerasan, pelat beton, tebal perkerasan jalan

The influence of foundation geometry on the uplift behaviour of piles with enlarged bases

1992 ◽  
Vol 29 (3) ◽  
pp. 498-505 ◽  
Author(s):  
E. A. Dickin ◽  
C. F. Leung
Keyword(s):  
Key Words ◽  
Design Method ◽  
Failure Mechanisms ◽  
Model Tests ◽  
Diameter Ratio ◽  
Uplift Capacity ◽  
Base Diameter ◽  
Centrifugal Model ◽  
Anchor Plates ◽  
Empirical Design

Centrifugal model tests investigating the influence of shaft to base diameter ratio and bell angle on the uplift capacity of piles with enlarged bases (or belled piers) in sand are reported. Increases in the angle of bell and in diameter ratio both result in a decrease in net uplift capacity and failure displacement. This appears to account for observed differences in uplift capacity between belled piers and anchor slabs. Studies of failure mechanisms around models of belled piers and anchor plates show distinctly different behaviour characteristics between foundation types. The comparatively low uplift capacities observed for belled piers are attributed to a lesser degree of soil mobilization. An empirical design method for belled piers is proposed in which appropriate factors which account for foundation geometry are applied to a simple continuous anchor formula. Key words : piles, sand, uplift capacity, centrifuge, design.

scholarly journals New Hungarian Mechanistic-Empirical Design Procedure for Asphalt Pavements

2020 ◽  
Vol 15 (1) ◽  
pp. 161-186
Author(s):  
Csaba Tóth ◽  
Péter Primusz
Keyword(s):  
Material Properties ◽  
Design Method ◽  
Design Procedure ◽  
Design Principles ◽  
Pavement Design ◽  
Asphalt Pavements ◽  
Alternative Procedure ◽  
Ongoing Research ◽  
Empirical Design

Certain elements of the currently used Hungarian pavement design method are based on the mechanistic-empirical pavement design principles, although they are not always readily implemented in practice. When designing a new pavement structure, it is only possible to select predetermined composition from a catalogue. The use of the Hungarian design catalogue is unquestionably comfortable, but nowadays special requirements (e.g. economy, sustainability) have been formulated as well. Those requirements increasingly call for the development of a method that can be used under Hungarian conditions, which can provide for the employment of various material properties. Instead of offering a predefined solution it needs to provide a useful tool for designers to enable realistic comparisons of engineering alternatives. This paper introduces the results of an ongoing research that aims to provide an alternative procedure for the design of newly constructed asphalt pavements. It establishes the framework for better characterization of the material properties of the natural subgrade and bound pavement layers compared to the utilization of predetermined designs. It also provides opportunity to consider local, environmental, geographical and other conditions and innovative building and technology capabilities.

scholarly journals Comparative Study of French and Chinese Asphalt Pavement Design Methods

2015 ◽  
Vol 15 (6) ◽  
pp. 923-928 ◽  
Author(s):  
Pierre Guy Atangana Njock ◽  
Li Yueguang
Keyword(s):  
Comparative Study ◽  
Asphalt Pavement ◽  
Design Methods ◽  
Pavement Design

INTERPRETATIONAL FIELD OF THE CONCEPT “WOMAN” IN ENGLISH AND KYRGYZ LINGUOCULTURES

2019 ◽  
pp. 54-56
Author(s):  
Баяманова М.С.
Keyword(s):  
Comparative Study ◽  
Key Words ◽  
Analytical Data ◽  
Semantic Field ◽  
Traditional Values ◽  
Lexical Unit ◽  
Semantic Fields ◽  
Field Culture

Summary: The article deals with the analysis of the interpretational field of the basic lexical units which represent the meaning of the concept “woman” in English and Kyrgyz languages and cultures. Comparative – contrastive analytical data of the most frequently used in both languages variants of the interpretation of the concept “woman” have been given. The semantic fields of nuclear and nearnuclear meanings of the lexical units, transforming the notion of “woman” in English and Kyrgyz languages and also the place and role of these notions in cultures and philosophy of the nations on the basis of mentality and traditional values have been studied and described. The situations of the use of this or that variant of the meaning of lexical unit. A comparative study of the definitions of the word “woman’ in English and Kyrgyz languages have been given. Key words: concept, woman, interpretational field, notion, definition, semantic field, culture, language, linguoculture, transformation Аннотация: В статье рассматриваются интерпретационные поля основных лексических единиц, репрезентирующих значение концепта «женщина» в английской и кыргызской лингвокультурах. Приводятся сравнительно-сопоставительные аналитические данные наиболее употребительных в речи обоих языков вариантов интерпретации концепта «женщина». Изучены и описаны семантические поля ядерных и околоядерных значений лексических единиц, трансформирующих понятие «женщина» в английском и кыргызском языке, а также роль и место этих понятий в культурах и философии народов на основе менталитета и традиционных ценностей. Приводятся ситуации использования того или ино- го варианта значения лексической единицы, проведено сравнительное изучение определений слова «женщина» в английском и кыргызском языках. Ключевые слова: концепт, женщина, интерпретационное поле, понятие, определение, семантическое поле, культура, язык, лингвокультура, трансформация Аннотация: Макалада англис жана кыргыз тилдеринде жана маданияттарында «аял» концептинин маанисин репрезентациалаган негизги лексикалык бирдиктер каралат. «Аял» концептин эки тилдеги кѳп колдонулуучу интерпретациялоо варианттарынын аналитикалык салыштырма маалыматтары изил- делип берилген. Англис жана кыргыз тилдеринде «аял» түшүнүгүн трансформациялаган лексикалык бирдиктердин түп нуска жана ага жакындашкан маанилери иликтелип каралган. Берилген түшүнүктѳрдүн элдик философиясында жана маданиятында, менталитеттин жана салттын негизинде эл арасына кеӊири тараган, элдик тилде жана маданиятта ойногон ролу менен орду чагылдырылган. Ар түрдү ситацияларда колдонулуучу тиги же бул лексикалык бирдиктердин маанисинин варианттары каралган, «аял» деген сѳздун англис жана кыргыз тилдериндеги түшүндүрмѳлѳрү салыштырылып изилделген. Түйүндүү сѳздѳр: концепт, аял, интерпретациялоо мейкиндиги, түшүнүк, түшүндүрмѳ, семантикалык чѳйрѳ, маданият, тил, лингвомаданият, трансформациялоо

An Update on Improved Flange Design Methods

2007 ◽  
Author(s):  
Warren Brown
Keyword(s):  
Design Method ◽  
Design Methods ◽  
Project Development ◽  
Design Improvement ◽  
Panel Session ◽  
Improved Methods ◽  
Made In

This paper details further progress made in the PVRC project “Development of Improved Flange Design Method for the ASME VIII, Div.2 Rewrite Project” presented during the panel session on flange design at the 2006 PVP conference in Vancouver. The major areas of flange design improvement indicated by that project are examined and the suggested solutions for implementing the improved methods into the Code are discussed. Further analysis on aspects such as gasket creep and the use of leakage-based design has been conducted. Shortcomings in the proposed ASME flange design method (ASME BFJ) and current CEN flange design methods (EN-1591) are highlighted and methods for resolution of these issues are suggested.

Factored axial compressive resistance of schifflerized angles

1991 ◽  
Vol 18 (6) ◽  
pp. 926-932 ◽  
Author(s):  
Seshu Madhava Rao Adluri ◽  
Murty K. S. Madugula
Keyword(s):  
Key Words ◽  
Design Method ◽  
Design Criteria ◽  
Design Practice ◽  
Buckling Mode ◽  
Flexural Buckling ◽  
Mode Of Failure ◽  
Current Design ◽  
Similarities And Differences ◽  
Compressive Resistance

The concept of schifflerization of 90° equal-leg angle is presented and its application in triangular-base latticed steel towers is explained. The similarities and differences between schifflerized angles and regular 90° angles are discussed. The current design practice for schifflerized angles is reviewed and its limitation is highlighted. A design method which includes the effect of the torsional-flexural buckling mode of failure is proposed. For ready use of designers, the factored axial compressive resistances of schifflerized angles are tabulated for both the present and proposed design methods. Key words: buckling, compressive resistance, design criteria, schifflerized angles, stability, standards, steel, struts, towers, guyed towers.

Impact of Secondary Flow on the Accuracy of Simplified Design Methods for Steam Turbine Stages

2012 ◽  
Author(s):  
Jan Schumann ◽  
Ulrich Harbecke ◽  
Daniel Sahnen ◽  
Thomas Polklas ◽  
Peter Jeschke ◽  
...  
Keyword(s):  
Secondary Flow ◽  
Steam Turbine ◽  
Design Process ◽  
Design Method ◽  
Computing Time ◽  
Leading Edge ◽  
Design Methods ◽  
Preliminary Design ◽  
Line Design ◽  
Radial Equilibrium

The subject of the presented paper is the validation of a design method for HP and IP steam turbine stages. Common design processes have been operating with simplified design methods in order to quickly obtain feasible stage designs. Therefore, inaccuracies due to assumptions in the underlying methods have to be accepted. The focus of this work is to quantify the inaccuracy of a simplified design method compared to 3D Computational Fluid Dynamics (CFD) simulations. Short computing time is very convenient in preliminary design; therefore, common design methods work with a large degree of simplification. The origin of the presented analysis is a mean line design process, dealing with repeating stage conditions. Two features of the preliminary design are the stage efficiency, based on loss correlations, and the mechanical strength, obtained by using the beam theory. Due to these simplifications, only a few input parameters are necessary to define the primal stage geometry and hence, the optimal design can easily be found. In addition, by using an implemented law to take the radial equilibrium into account, the appropriate twist of the blading can be defined. However, in comparison to the real radial distribution of flow angles, this method implies inaccuracies, especially in regions of secondary flow. In these regions, twisted blades, developed by using the simplified radial equilibrium, will be exposed to a three-dimensional flow, which is not considered in the design process. The analyzed design cases show that discrepancies at the hub and shroud section do exist, but have minor effects. Even the shroud section, with its thinner leading-edge, is not vulnerable to these unanticipated flow angles.

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