关键词: 桥梁工程； 护栏刚度； 荷载横向分布； 刚接梁法； 柔度系数矩阵

Abstract: Current load transverse distribution calculation methods, such as the rigid-jointed plate (beam) method and rigid crossbeam method, both neglect the influence of guardrail stiffness. However, for the low-height beam structures, the guardrail stiffness often significantly exceeds that of the main girders. Ignoring its influence will result in a deviation in the calculation of the load transverse distribution coefficient, making it difficult to accurately reflect the true stress state of the main beam. To address this, an improved load transverse distribution calculation method was developed by modifying the flexibility coefficient matrix to account for guardrail stiffness effects on the basis of the traditional rigid-jointed beam method and verified through on-site load tests. The research results demonstrate that compared to the traditional rigid-jointed beam method, the proposed method significantly improves calculation accuracy and aligns more closely with the actual mechanical response of bridges, which provides a more reliable theoretical basis for bridge load test, structural stress analysis and load-bearing capacity evaluation.

Key words: bridge engineering; guardrail stiffness; load transverse distribution; rigid-jointed beam method; flexibility coefficient matrix