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Abstract

Suspension bridges are characterized by low longitudinal stiffness and large deformation. To reduce the longitudinal displacement at the girder ends and the required movement capacity of the expansion joints, static and dynamic finite element analysis models of the main bridge were established based on the Labo Chongtian River Bridge. The effects of two longitudinal restraint systems, including a central buckle combined with longitudinal dampers and a static displacement-limiting and dynamic damping system, on the static and dynamic responses of key structural components were analyzed. The two systems were compared to identify an appropriate longitudinal restraint system, and a parametric analysis of the selected system was conducted. The results show that, without any longitudinal restraint measures, the required movement capacity of the expansion joints of the Labo Chongtian River Bridge is at least 2 320 mm. Both the central buckle combined with longitudinal dampers and the static displacement-limiting and dynamic damping system can substantially reduce the girder-end displacement, with reductions of approximately 34%. However, the latter is easier to implement, and its construction cost is only 50% of that of the former. Therefore, it is the more appropriate longitudinal restraint system. The analysis of the displacement-limiting parameters shows that, when the limiting gap is 0.7 m and the limiting stiffness is 200 MN/m, the required movement capacity of the expansion joints of the Labo Chongtian River Bridge can be reduced to 1 520 mm, representing a reduction of 34.5%.

Publication Date

8-16-2026

DOI

10.14048/j.issn.1671-2579.2026.04.017

First Page

161

Last Page

169

Submission Date

August 2026

Reference

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