engleski

Static and dynamic testing of overpass on Slavonian Avenue in Zagreb

This paper presents results of experimental testing performed on overpass located in the east of Croatia’s capital, Zagreb. This overpass is included in the project of development of road infrastructure in this part of town which has a big population growth in the last decade. The main (central) overpass consists of two parallel overpasses (southern and northern)* which have identical structure system and dimensions. The overall lenght of the overpass is 164, 0 m (5 spans) and the overall width of the overpass is 13, 50 m. Load carrying structure of the overpass is based on precast prestressed longitudinal I cross – section girders layed on piers and a plate concreted on girders. Continuity of longitudinal girders is accomplished with cross girders constructed on each bearing point of the overpass (piers and abutments). Static testing was performed with six heavy trucks (~ 330 kN each) that were used to load every span of the overpass in symmetrical and unsymmetrical way. During the phases of loading and unloading deflections and strains were measured with LVD T sensors on total of 8 locations. Additionally, deflections were measured geodetically in the middle of spans and on bearings using two parallel lines with measuring points on the pavement. Dynamic testing was performed using heavy trucks that were driving over the overpass. Dynamic parameters were determined from the response of the structure. They were measured using sophisticated equipment and are presented in this paper graphically and tabulary. Results of both static and dynamic testing are very important for evaluation of structure’s behaviour and state and they need to be in correlation with those derived from numerical model. In this case, results derived from the experiment and from numerical model show satisfying correlation.

overpass; experimental testing; deflection; strain; traffic load

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