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Related Experiment Video

Updated: May 17, 2026

Determination of the Mechanical Properties of Flexible Connectors for Use in Insulated Concrete Wall Panels

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Load distribution factor for moment in large-offset staggered widening bridges.

Changxi Wang¹, Zixiang Zhang², Yu Bao³

¹School of Environmental Art, Hubei Institute of Fine Arts, Hubei, Wuhan, 430205, China.

Scientific Reports

|May 15, 2026

Summary

This study analyzes load distribution in staggered widening bridges, a unique design where new piers don't align with old ones. A new analytical model and parametric study propose a generalized formula for predicting load distribution factors (LDFs) in these structures.

Keywords:

General formula Load distribution factor Rigid-jointed girder method Simplified analysis model Staggered widening bridge Supporting effects Transverse vehicular load distribution

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Area of Science:

Structural Engineering
Bridge Engineering
Civil Engineering

Background:

Staggered widening bridges present unique structural challenges due to misaligned piers.
Existing research on staggered widening bridges is limited, necessitating further investigation.
The distinct span layout affects vehicular load distribution, particularly for interior girders near closure slabs.

Purpose of the Study:

To investigate the load distribution factor (LDF) for bending moment in staggered widening bridges.
To develop and validate an analytical model for staggered widening bridge analysis.
To compare load distribution characteristics with conventional widening schemes and identify key influencing parameters.

Main Methods:

Development of a simplified analytical model using the rigid-jointed girder (RJG) method with modified boundary conditions.
Verification of the analytical model against finite element analysis (FEA) results.
Parametric study to assess the impact of various design parameters on LDFs.

Main Results:

The modified RJG model accurately captures the mid-span supporting effects of adjacent piers.
Transverse load distribution in staggered widening bridges differs significantly from conventional designs.
Key parameters influencing LDF include diaphragm rigidity, flange rigidity, girder rotational stiffness, closure slab width, girder width, and the number of girders.

Conclusions:

A generalized formula for predicting girder LDF in staggered widening bridges has been proposed based on parametric analysis.
The findings provide valuable insights for the design and analysis of staggered widening bridges.
Further research can build upon this model to enhance bridge safety and efficiency.