Vesna Dragčević

University of Zagreb

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Methods for Setting Road Vehicle Movement Trajectories

The Baltic Journal of Road and Bridge Engineering (2008)

Vesna Dragčević Željko Korlaet Ivica Stančerić

The paper gives overview of the methods for setting the vehicle movement trajectory. Results have been shown, within wider research project, of the comparative analysis of methods for setting vehicle movement trajectory, bearing in mind relevant criteria and respecting the results of proving range test drives on field. Respecting the laws of geometry of movement and behaviour of the vehicle under real traffic conditions in small radii curves, optimum shaping of steering path and defining of kinematic vehicle model was tested by using computer programme of verified reliability developed in the Faculty of Civil Engineering of the University of Zagreb.

10.3846/1822-427x.2008.3.57-64

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Evaluation of the road infrastructure projects

Željko Stepan Vesna Dragčević

Vrednovanje projekata cestovne prometne infrastrukture temeljni je način ocjene i analize ulaganja u pojedini projekt, te predstavlja nužnost pri ocjeni ekonomske opravdanosti i izboru optimalnog rješenja.Ispravno vrednovanje građevinsko-prometnog

10.5592/co/phdsym.2019.12

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SIGHT DISTANCE TESTS AT ROAD INTERSECTIONS WITH UNFAVOURABLE ANGLES

Proceedings of the International Conference on Road and Rail Infrastructure CETRA (2012)

Ivica Stančerić Željko Korlaet Vesna Dragčević

Due to the limited field of view of the driver on the secondary road safety assessment capabilities of performing the desired action of turning and crossing at the road intersections with unfavourable angles ( 110°) becomes uncertain. Since all the intersections from the standpoint of traffic safety services must have sufficient sight distance at the road intersections with unfavourable angles it is common to perform reconstruction of the secondary road axis, so that main and secondary road axis intersects at approximately right angle. This paper will present how sight distance tests based on measurements of the driver visual field from different types of vehicles (passenger car and heavy vehicles) were performed on the road intersections with unfavourable axis angles. Test results will show for which road intersection angles it is possible to keep the secondary road axis in the direction, without the need for reconstruction.

Sight

Road surface

Visual angle

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Nadogradnja i elektrifikacija postojeće željezničke pruge od značaja za međunarodni promet M601 Vinkovci-Vukovar, I. faza: Građevinski infrastrukturni podsustav, 4. etapa = II. dionica od km 16+093.36 do km 19+251.00 - Glavni projekt zaštite od buke

Stjepan Lakušić Vesna Dragčević Maja Ahac Saša Ahac Tamara Džambas

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Tehnički elaborat zaštite od buke : Željeznička pruga Oštarije - Knin - Split, Dionica Perušić - Gračac (III. poddionica: most Jaruga (km cca 136+457) - kolodvor Gračac (km cca 159+970))

Stjepan Lakušić Vesna Dragčević Saša Ahac Tamara Džambas Ivo Haladin

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METHOD TO RECONSTRUCT URBAN TRANSPORT FACILITIES

WIT transactions on the built environment (2004)

Tatjana Rukavina Stjepan Lakušić Vesna Dragčević Miroslav Šimun

Measurements have shown that the International Roughness Index (IRI) values for the urban transport facilities predicted for reconstruction range from 5m/km to 14m/km, and for new or already reconstructed ones the values vary about 2m/km. Usual ways of repair of the pavement facilities structures in the city of Zagreb are: 1) replacement of already existing asphalt layers with a new bituminized crushed stone material base course and wearing asphalt concrete layer and 2) performance of the new pavement structure (layer of mechanically compacted course of grain stone material, bearing layer stabilized by hydraulic binder, bearing layer made of bituminized crushed stone material and a layer of splitmastix asphalt wearing course - SMA. As a large number of urban facilities are planned for reconstruction, the study was conducted to justify each repair mode. The study proposes the IRI values, obtained from the investigation measurement results upon which the reconstruction could be carried out to get the aimed IRI values ranging up to 2m/km in the end point.

Asphalt pavement

Crushed stone

International Roughness Index

Wearing course

10.2495/ut040471

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The Influence of Visibility Conditions in Horizontal Road Curves on the Efficiency of Noise Protection Barriers

Romanian Journal of Transport Infrastructure (2013)

Tamara Džambas Saša Ahac Vesna Dragčević

Abstract Ensuring sufficient visibility on planned roads by sight distance testing is an integral part of every project, but problems with visibility can emerge when noise barriers are erected on existing roads. Namely, in order to provide sufficient noise protection, high noise barriers are often placed at minimum distance from the carriageway edge, and additional visibility testing in most cases is not carried out. Research described in this paper consists of stopping sight distance tests conducted by means of specialized road design software MX Road, and noise barrier optimization conducted by means of specialized noise prediction software LimA using static noise calculation method RLS 90. The aim of this research is to establish whether the required stopping sight distance on road sections where minimum design parameters are applied can be achieved if the noise barrier is placed at minimum distance from the carriageway edge, and to establish whether the optimized dimensions of planned noise protection barrier will change if the barrier is placed on larger distance from the noise source, which is, in this case, the existing road.

Visibility

Carriageway

Sight

Roadway noise

10.1515/rjti-2015-0016

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Traffic and industrial noise protection in urban areas - experience from Croatia

Stjepan Lakušić Vesna Dragčević Dalibor Bartoš

One of the main reasons of diminishing quality of living in urban areas is the noise. Higher noise levels are mostly caused by road and rail vehicles traffic and sometime the industrial plants operation. This paper presents the protection of residential areas in Zagreb from traffic and industrial noise. As one example is presented protection from road traffic noise of a primary school in Zagreb, which is located near a city avenue with very high traffic volume. The other example is about protection against the industrial noise, of a residential area located near an asphalt mixing plant. Both locations were protected by the noise barriers. On the first location (Primary School) noise protection barrier was put up in September 2006 and on the second (asphalt mixing plant) in February 2007. In both cases short-term measurements were carried out after the construction of the barriers. One sound level meter was placed in front of the barrier and another at the same time behind the barrier, both close to the protected objects. The results of the measurement on the site were compared with calculated forecasted results from the project and a very good match between the two sets was obtained.

Roadway noise

Urban area

Residential area

Industrial area

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A numerical model for road vehicles driving simulation in a horizontal curve

Vesna Dragčević Željko Korlaet

Racunalni program za simulaciju kretanja vozila razvijen je na Građevinskom fakultetu Sveucilista u Zagrebu. Velika tocnost rezultata dobivenih racunalnim programom potvrđena je verifikacijom pouzdanosti s rezultatima eksperimentalnih ispitivanja provedenih na poligonu. Koristenjem CAD aplikacija, numericki rezultati prezentirani su graficki.Program ima mogucnost izbora standardnih tipova vozila (autobus, teretni automobil, teretni automobil s prikolicom, tegljac s poluprikolicom) koja se najcesce susrecu na europskim cestama uz mogucnost izbora razlicitih dimenzija vozila i razlicitih nacina oblikovanja linije vođenja. Linije vođenja u krivini moguce je oblikovati: - pravcem i kružnim lukom - pravcem, klotoidom i kružnim lukom Za definiranu liniju vođenja, koristenjem spomenutog programa u okviru AutoCAD-ovog sucelja automatski se iscrtava linija povlacenja odabranog mjerodavnog vozila. Oblikovanje linije vođenja samo s pravcem i kružnim lukom uobicajeno je i kod drugih poznatih software-a koji simuliraju kretanje vozila. Na prometnim povrsinama u kojima zakonitosti geometrije kretanja imaju presudan utjecaj prometuje se malim brzinama i djelovanje bocnih sila može se zanemariti, te na prijelazu iz pravca u kružni luk ne treba izvesti prijelaznicu zbog postupnog i kontinuiranog svladavanja bocnih sila. Ispitivanja su pokazala da liniju vođenja oblikovanu bez prijelaznih krivina vecina teretnih vozila, zbog konstruktivnih mogucnosti upravljackog mehanizma, ne može pratiti bez odstupanja. Zato je u ovom programu predviđena mogucnost zadavanja linije vođenja oblikovane s klotoidom na prijelazu iz pravca u kružni luk.

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Sprayed concrete application for slope protection

Vesna Dragčević Tatjana Rukavina Vladimir Gornik

U radu se ukazuje na mogucnosti primjene mlaznog betona za zastitu pokosa cestovnih prometnica. Pri izradi mlaznog betona posebnu pozornost treba posvetiti zastiti okolisa, odnosno izboru projektnih rjesenja koja ce osigurati dobro uklapanje građevine u prirodni okolis.

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