Research on Torsional Characteristics of Main Girders in Half-Through Truss Bridges

YUE Zixiang; ZHAO Rui; WANG Lixiao; WEN Qingjie

doi:10.3724/j.gyjzG23120504

Volume 55 Issue 11

Nov. 2025

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YUE Zixiang, ZHAO Rui, WANG Lixiao, WEN Qingjie. Research on Torsional Characteristics of Main Girders in Half-Through Truss Bridges[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(11): 115-123. doi: 10.3724/j.gyjzG23120504

Citation:

YUE Zixiang, ZHAO Rui, WANG Lixiao, WEN Qingjie. Research on Torsional Characteristics of Main Girders in Half-Through Truss Bridges[J]. INDUSTRIAL CONSTRUCTION, 2025, 55(11): 115-123. doi: 10.3724/j.gyjzG23120504

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Research on Torsional Characteristics of Main Girders in Half-Through Truss Bridges

doi: 10.3724/j.gyjzG23120504

1. College of Civil Engineering and Architecture, Xinjiang University, Urumqi 830047, China;
2. Xinjiang Key Laboratory of Building Structures and Earthquake Resistance, Urumqi 830017, China;
3. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China

Received Date: 2023-12-05
Available Online: 2026-01-06
Publish Date: 2025-11-20

Abstract

Abstract

Torsional stiffness is crucial for the stability and service performance of half-through truss bridges. To study the torsional characteristics of the main girder of a half-through truss bridge， the half-through truss is equated to an open-section thin-walled member， and the calculation formula for the free torsional moment of inertia of the main girder is derived. Since the main truss of the half-through truss bridge resists warping deformation through bending， it contributes significantly to the torsional stiffness of the main girder. Based on the vertical bending behavior of the main truss， the correction formula for the torsional moment of inertia of the main girder is derived. Taking a half-through truss pedestrian bridge as an example， the torsional moment of inertia of the bridge under different width-span ratios was calculated using theoretical and finite element analysis. The results showed that when calculating the torsional moment of inertia of the main girder of a half-through truss bridge， the free torsional moment of inertia calculated using the equivalent open-section differed significantly from the actual torsional stiffness， and the bending correction of the main truss must be considered. The contribution of the main truss to torsional resistance through bending increased rapidly with the increase in the width-span ratio. The theoretical solution， after incorporating the correction， showed good agreement with the finite element results. The theoretical formula can be used to explain the torsional mechanism of this type of bridge. However， since the theoretical calculation did not account for the beneficial effect of the transverse bending resistance of the bottom chord， the theoretical solution gradually became smaller than the finite element solution as the bridge width increased. Based on the mechanism study， a method of adding X-shaped longitudinal bracing between the upper transverse beams to improve the torsional stiffness was proposed. The addition of X-shaped longitudinal bracing not only preserves the dimensions of the half-through truss bridge but also significantly enhances the torsional stiffness and stability of the structure.
- half-through truss bridge,
- torsional moment of inertia,
- equivalent thin-walled beam,
- stiffness strengthening,
- theoretical research

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References(21)

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