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The Comparison of Measured and Simulated Dynamic Responses of Vehicles Indicated by Road Pavement Unevenness

Abstract

The article presents the comparison of measured and simulated dynamic responses of heavy vehicle which are indicated by road pavement unevenness. This unevenness was represented by speed control bumps, potholes and stochastic pavement unevenness. The objective simulations were realized through the medium Quarter- Car Simulation by means of application of simulated theory of dynamic systems. The reliability of used model was verificated with comparison of measured and simulated values of sprung mass T815 vehicle accelerations. In the article, there are presented courses of total vertical forces of Quarter-Car Simulation for the first, the second and the fourth classification degree of unevenness, which was considered through the world's respected parameter IRI (International Roughness Index). Obtained simulated dynamic effects of the vehicle on the pavement were used for modification of a relevant Slovak design method of asphalt pavements.

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Influence of the interface conditions on flexible pavement structures life

Abstract

This paper aims to establish the interface conditions influence on the flexible pavement structures life. The methodology consists in using the interface constitutive model available in the Alizé calculation program to calculate the stresses and strains in the flexible pavement structures.

The design criteria related to limiting fatigue cracking of asphalt layers and permanent deformations at the subgrade level from the road bed are used to estimate the flexible pavement structures lifetime.

When calculating the critical stresses and strains, most mechanical design methods of the flexible pavement structures considers that the road layers at interfaces are perfect bonded or total unbonded.

Proper modeling of the interface binding condition is an important aspect in understanding the real behaviour of in-service flexible pavement structures.

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The Influence of The Static Layout on The Stress and Deformation State for Concrete Arched Bridges with Upper Carriageway

Abstract

Arch bridges were the first constructions with considerable spans built by man, due to the materials and technologies available at that time. Afterwards, these works of art have diversified and are now solutions used in countless situations, especially when crossing deep valleys.

Both their economic and architectonic aspects are hard to combat and have led to selecting this type of structure for more and more locations.

The paper will contain a brief presentation of some aspects regarding upper path concrete arch bridges composition and design methods. Also, it will have a case study regarding structural stresses over the different construction stages, and for several support hypotheses.

The case study will reflect the Crivadia viaduct, situated on DN 66, at km 150+672. The bridge has a main span of 59.20m and an overall height of 15.00m, serving a 7.80m wide carriageway and two 2.20m wide footways. It has a total length of 107.60m.

Based on the results of the case study, conclusions will be drawn regarding stress variation over the construction stages and under different support hypothesis, comparing these with the initial results.

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The Reflective Cracking in Flexible Pavements

Portuguese)”, Ph. D. Thesis, University of Minho, Portugal, 1999. [4] J. SOUSA, S. SHATNAWI, J. COX, “An approach for investigating reflective fatigue cracking in asphalt-aggregate overlays”, Proceeding of the Third International RILEM Conference. 1996. [5] J. SOUSA, J. PAIS, G. WAY, “A mechanistic-empirical based overlay design method for reflective cracking”, Asphalt Rubber 2003 Conference, Brasilia, Brasil, 2003. [6] J. SOUSA, J. PAIS, R. SAIM, G. WAY, R. STUBSTAD, “Development of a mechanistic-empirical based overlay

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Structural Aspects of Railway Truss Bridges Affecting Transverse Shear Forces in Steel-Concrete Composite Decks

References 1. Furtak K., Mosty zespolone , PWN, Warszawa 1999 2. Hou W., Ye M., Design methods of headed studs for composite decks of through steel bridges in high-speed railway , J. Cent. South Univ. Technol., 18 (2011) 946-952 3. Karlikowski J., Madaj A., Wołowicki W., Mostowe konstrukcje zespolone stalowo-betonowe , WKŁ, Warszawa 2007. 4. Siekierski W., Analiza numeryczna sił rozwarstwiających w pomoście zespolonym przśsła kratowego , Inżynieria i Budownictwo, 12 (2011) 674-676. 5. Siekierski W., Kolejowe przśsła kratownicowe z pasem

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Exergetic Analysis of Hybrid Photovoltaic - Thermal Solar Collectors Coupled to Organic Rankine Cycles

correlations , vol. 34, pp. 23–29, 2009. 8. A. A. Ghoneim, M. Y. Aljanabi, A. Y. Al-Hasan, A. M. Mohammedein.: Thermal and electrical performance of hybrid photovoltaic-thermal collector, Int. Energy J., vol. 10, no. 1, 2009. 9. T. T. Chow, W. He, J. Ji.: Hybrid photovoltaic-thermosyphon water heating system for residential application , Sol. Energy, vol. 80, no. 3, pp. 298–306, 2006. 10. C. Zhou, R. Liang, J. Zhang.: Optimization design method and experimental validation of a solar pvt cogeneration system based on building energy demand, Energies , vol

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The Risk Assessment for a Single Building on the Landslide Areas and Floodplains

.J., Chao D., Chowdhury S.: A web-based GIS for managing and accessing landslide data for the town of Peace River , Nat. Hazards Earth Syst., Canada. Sci., 9, 2009, 1433-1443. 10. Lough K.G., Stone R.B., Tumer I.: The risk in early design method , https://www.tandfonline.com/doi/abs/10.../09544820701684271 . 11. Matousek M.: Outcomings of a Survey on 800 Construction Failures , IABSE Colloquium on Inspection and Quality Contro1, Cambridge, England, July 1977. 12. Mrowczynska M., Laczak A., Bazan-Krzywosztańska A, et al.: Efficiency with the Risk of

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