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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 83
PROCEEDINGS OF THE EIGHTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY
Edited by: B.H.V. Topping, G. Montero and R. Montenegro
Paper 141

Static Behaviour of a Five-Span Concrete Filled Steel Tubular Arch Bridge

Y.Y. Wang12, S.M. Zhang1, X.L. Wang1 and T. Zhang1

1School of Civil Engineering, Harbin Institute of Technology, China
2Postdoctoral Research Station, China Railway 13th Bureau Group Co. Ltd., China

Full Bibliographic Reference for this paper
Y.Y. Wang, S.M. Zhang, X.L. Wang, T. Zhang, "Static Behaviour of a Five-Span Concrete Filled Steel Tubular Arch Bridge", in B.H.V. Topping, G. Montero, R. Montenegro, (Editors), "Proceedings of the Eighth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 141, 2006. doi:10.4203/ccp.83.141
Keywords: concrete-filled steel tube, arch bridge, static behaviour, finite element analysis, ANSYS, wind brace.

Summary
A five-span tied rigid-frame concrete filled steel tubular arch bridge, Han River North Bridge, is now under construction and expected to be finished in July, 2006. It is located in Chao-zhou City of Guangdong Province, China. The constituent spans are 11+85+114+160+114+85+11m, and all of them are jointed with 6 V-shape support piers to form a rigid-frame. And the decks are designed to have six lanes of 30m total width. Each arch is composed of one vertical dumbbell-shape CFST rib and one hollow circular steel one (side rib) which are connected by four short hollow steel tubes every 4 meters. Similar to the most CFST arch bridges in China, each vertical rib of the Han River North Bridge is welded by two steel chords and two parallel steel webs with core concrete supporting. Forty-nine pairs of suspenders are used to transfer the loads between the arch ribs and decks. The distance of the each pair is 8.0m. Four inter-lies are designed for every arch rib and anchored in the outside of the supports [1].

The special features of this bridge compared with most of the existing bridges are listed as follows: it is the largest CFST arch bridge without any transversal braces in the world; all of the five spans are jointed to each other with V-shape support piers to form a rigid-frame; some side arch ribs are added to stiffen lateral rigidities of the vertical arch ribs; and the feet of the side ribs are not anchored to the ground but to the adjacent girders below the sight-seeing platforms on the bridge. It can be found that the construction of Han River North Bridge is complex and particular.

The arch ribs in Han River North Bridge are composed of three parts: vertical rib, side ribs and four connecting bars which start from the vertical rib and join symmetrically to a same point in the axis of side ribs. The elements in the arch form a connected pentahedron every four meters. To simulate the arch ribs, restraining equations were employed in the model. The details of the model developed can be seen in reference [2]. The main members in the bridge were simulated by the following elements: element BEAM188 were used for the vertical arch ribs, element BEAM4 for the side arch ribs, connecting bars, concrete V-shape support piers and box girders, steel longitudinal and transverse girders; LINK10 for the suspenders and inter-lies; SHEEL181 for the decks. The fixed ends were located on the top surface of the cushion cap.

To study the influence of the side arch ribs, the displacements at the crown of the bridge with and without side arch ribs were calculated. It shows that the side ribs both strengthen the out-of-plane and in-plane stiffness of the vertical ribs, but these actions to the former stiffness is great and those to the latter one is relatively small. However, a disadvantage is that the side ribs that make the centroid of the combined arch ribs departing from the axis of the vertical arch ribs, bring additional distortion and out-of-plane displacements in the ribs.

This paper also shows the models of the bridge with some wind braces. Two cases of the wind braces were studied: single wind braces at the crown as designed for case 1, and two braces at the nearest quartered points to the crown and one brace at the crown are for case 2. All the wind braces are steel circular tubes of 1200mm diameter and of 24mm thickness. It is found that the wind braces have little effect on the in-plane stiffness of the ribs, but strengthen the out-of-plane stiffness of the ribs greatly: the stiffnesses are increased by 2030% when one wind brace is used, and another increase of 10% in stiffness is obtained if two more braces are used at the quartered points of the ribs than those of case 1.

References
1
The 13th bureau of China Railway Engineering Corporation, 2005, "The construction documents for Han River North Bridge, Part 2".
2
Y.Y. Wang, S.M. Zhang, Y. Geng, G. Ranzi, "Numerical simulation and research on the Han River North Bridge", ASCCS' 8th International Conference on Steel-Concrete Composite and Hybrid Structures, 12-15 August, 2006, Harbin, China.

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