连续结合梁桥负弯矩区混凝土板裂缝宽度控制方法研究

Methods for controlling crack width of concrete slab in negative moment area of continuous composite bridges

连续结合梁桥负弯矩区混凝土板裂缝宽度控制是施工设计中的重要一环,控制效果直接关系到结构的安全性和耐久性。笔者受设计部门委托,在多年试验研究的基础上,结合施工方法,例举并阐述了多种裂缝宽度控制方法及其原理,对其控制效果作了综合比较。对高速铁路(40+50+40)m连续结合梁初步设计方案提出了建议,已供设计部门参考。

The controlling of crack width in negative moment area is an important issue in the design and construction of continuous composite bridges. The effect has direct influence to the safety and durability of the bridges. Under the requiring of the design department, based on several years of researches and combined with the construction methods, several methods of controlling crack width are listed. The principles are illustrated, and the effects are compared. Suggestions are given to (40+50+40) m continuous composite bridges of highspeed railways in China, which have been provided as references for the design department.