连续刚构桥主梁裂缝成因分析及对策研究

预应力混凝土连续刚构桥在施工或营运过程中,主梁会出现不同性质的裂缝,这些裂缝不仅会削弱桥梁结构的强度和刚度,还会加速钢筋锈蚀,影响桥梁结构的安全性和耐久性。本文重点从结构受力、温度应力等方面对主梁顶板、腹板及底板三个部分的裂缝成因依次进行深入、系统的分析。最后,从设计和施工两个方面提出控制连续钢构桥主梁裂缝的措施。

Deck Crack Cause Analysis and Countermeasures of Continuous Rigid Frame Bridge

In the construction or operation of prestressed concrete continuous rigid frame bridge,the main beam will appear cracks with different nature,and these cracks will not only weaken the strength and stiffness of the bridge structure,but also accelerate the reinforcement corrosion,affecting the safety and durability of the bridge structure.This article focuses on the turn-depth and systematic analysis on the crack causes in main beam,webs and bottom plates from structural force,temperature stress and other aspects.Finally,from both the design and construction aspects the control measures of the main beam cracks of the continuous steel bridge are proposed.