146 Used software: Scia Engineer, Nexis CAE Civil Works 3 University of Žilina, Faculty of Civil Engineering Contact prof. Ing. Josef Vičan, PhD., Ing. Jaroslav Odrobiňák, PhD. Address Department of Structures and Bridges Univerzitná 8215/1 01026 Žilina, Slovakia Phone +421 41 513 5650, +421 41 513 5664 Email [email protected], [email protected] Website svf.uniza.sk/kskm The Department of Structures and Bridges is one of the basic parts of the Faculty of Civil Engineering at the University of Žilina. The department insures training in subjects of the theory of building structures, such as steel, concrete, timber and masonry structures, and the subject of building materials as well. As a profile department of the educational program Civil Engineering Structures, the department also insures training in subjects of bridge building, i.e. steel, concrete and timber bridges and subjects focussed on FEM modelling and analysis of structures with specialization on bridges. The research activities of the department are oriented to investigation of actual behaviour of steel and concrete structures and bridges, as well as to problems connected with evaluation of existing building structures and bridges. There is analysed the influence of essential failures of bridge structures on their global behaviour and reliability of the whole system in order to define residual lifetime and to determine optimal inspection intervals, as well as to determine the optimal time for rehabilitation and reconstruction of bridges in service. The obtained knowledge of analysis of actual behaviour of building structures and bridges are taken in consideration at design of new structures with emphasis to very effective prestressed and steel and concrete composite bridge systems. In the ambit of cooperation with practice, the department performs technical, judgement and advisory activity in following regions: • Diagnostics of building structures and bridges, • Evaluation of technical state of existing building structures and bridges, • Static calculations, verification of reliability and determination of load carrying capacity of existing bridges, • Verification of behaviour of new bridges as well as existing bridges by means of proof load testing, • Expertises of projects of building structures and bridges as well as projects of reconstructions with regard to new scientific-technical knowledge and development trends in bridge engineering, • Development of conceptions and methodologies, especially in the regions of bridge management, evaluation of existing bridges and determination of their load carrying capacity, • Organisation of educational courses and seminars specialised in bridge management and harmonisation of the Slovak technical standards with European standards. The static analysis was carried out by the Department of Structures and Bridges within the scope of the preparation of the documentation for a building approval ordered by the engineering and consulting company Reming Consult, a.s. The aim of the project of a new bridge in Trenčín was to design a connection between the city borough Orechové and an island located between the natural course of the Váh River and the Biskupice artificial river-canal. Because of the length of the bridge and the request for an architecturally dominant structure, a cable-stayed bridge was suggested. An asymmetrical cable-stayed bridge with inclined cables on a pylon combined with a continuous composite steel and concrete deck was chosen. The cross-section of the deck consists of two trapezoid-shaped steel box girders and a reinforced concrete slab. A six-span continuous deck overpasses the spans; the lengths are 21+18+18+20+140+21 m. The longest span bridges the natural course of river, while the others overpass the inundation area. The bridge deck must bear an 8.0 m wide road and 2.0 m wide sidewalk on both sides. The main trapezoidal steel box girders are of a constant height of 1.4 m and the axial distance of the girders is 7.6 m. The cross beams are of a variable height and have circular bottom haunches. The reinforced concrete slab is 15.5 m wide with varying thicknesses from 200 mm at the end of the overhang up to 375 mm above the main girders. The 49.0 m high pylon plays the dominant aesthetic role. It consists of two double cranked legs with a width of 1.6 m at the top and 2.0 m at the bottom. In the longitudinal direction the width of the pylon conically increases from 2.5 m at the top to 5.0 m at the foundation plate. Both abutments and pier P5, placed on the island’s side, are made of reinforced concrete. On the other hand, three remaining supports P1, P2 and P3 are designed as hinged piers made of a pair of steel tubes filled with concrete, because they have to carry tensile reactions resulting from the response of an asymmetrically hung deck. The foundation of all supports is designed as a base plate resting on reinforced concrete piles with a diameter of 970 mm. The analysis and design were done with respect to the proposed method of the bridge’s erection. The system of temporary supports during concrete casting and consequent cable activation were the main aspects to be taken into account. It means: • The erection of the steel structure was a combination of an in-situ assembly and longitudinal sliding on permanent and intermediate temporary supports; • Then, the steel structure is acting as an elevenspan continuous structure during the casting of the concrete; Asymmetrical cable-stayed bridge This project regards a new road bridge over the Váh River in Trenčín (SK); an asymmetrical cable-stayed bridge with two planes of inclined cables onto a pylon combined with a continuous composite steel and concrete deck. A six-span continuous deck, that overpasses spans of a length of 21+18+18+20+140+21 m, is composed of two trapezoid-shaped steel box girders and a reinforced concrete slab. The 49 m high pylon with latticed double cranked pylon legs plays a dominant aesthetic role. Firstly, several plane member models were analysed for the preliminary design. Optimised data, like geometry, stiffness redistribution, cable prestressing, etc., were implemented into a three dimensional model using a combination of plane and member finite elements. Initial prestressing, nonlinear behaviour of cables and second order effects were taken into account during the nonlinear analyses. Owner: Trenčín city Architect: n/a General Contractor: n/a Engineering Office: Reming Consult, a.s. Construction Start: 2010 Construction End: 2011 Location: Trenčín, Slovakia Project Information Short Description
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