带挂梁的T型刚构桥拆除过程受力特征分析

Analysis of Mechanical Behavior during the Demolition Process of T-shaped Rigid Frame Bridge with Hanging Beam

受长悬臂影响,带挂梁的T型刚构在单侧失重情况下具有失稳破坏的特征,目前对于病害严重的该类型桥梁一般采取拆除处理。为保障拆除施工期间的安全,不因拆除而发生突然性倒塌,需对拆除全过程进行受力特征分析,针对性地提出控制措施。本文通过实桥拆除案例,论证拆除计算要点,并进行现场验证,为类似的桥梁拆除提供参考经验。

The T-shaped rigid frame with hanging beams has the characteristic of sudden failure under the influence of long cantilevers in the case of unilateral weight loss.Currently,for this type of bridge with severe diseases,demolition treatment is generally adopted.To ensure safety during the demolition construction period and prevent sudden collapse due to demolition,it is necessary to conduct a stress behavior analysis of the entire demolition process and propose targeted control measures.This article uses a real bridge demolition case,combined with the stress characteristics of the demolition process,to demonstrate the calculation points of demolition calculation,and conducts on-site verification,providing reference experience for similar bridge demolition.