单坡型桥梁混凝土护栏裂纹防撞性能影响分析

Study on Influence of Cracks on Safety Performance of Bridge Reinforced Concrete Barrier

由于混凝土材料抗拉强度低的特点,单坡型桥梁钢筋混凝土护栏通常是带裂纹工作的。为了研究裂纹对于单坡型桥梁钢筋混凝土护栏防撞性能的影响,总结了单坡型桥梁钢筋混凝土护栏裂纹特点,并进一步分析了单坡型桥梁钢筋混凝土护栏裂纹的类型。在此基础上,本文采用文献资料调研、理论分析以及计算机仿真方法分析了单坡型桥梁钢筋混凝土护栏裂纹对其防护能力的影响,认为虽然混凝土材料在裂纹处不连续,但由于钢筋的存在,不会影响护栏作为纵向的连续结构整体发挥安全防护作用,因此裂纹对单坡型桥梁钢筋混凝土护栏的防护能力没有影响。本文最终通过实车碰撞试验对分析结果进行了验证。

Because of the low tensile strength of concrete material characteristics, single slop bridge reinforced concrete barrier is often work with crack. In order to study the effect of crack on the protective performance of single slop bridge reinforced concrete barrier, we make a summary for the fea- ture of crack on single slop bridge reinforced concrete barrier, and do further analysis of the types of crack on single slop reinforced concrete bridge barrier. On this foundation, we do research on effect of crack on single slop reinforced concrete bridge barrier＇ s protective performance, by the method of litera- ture research , theoretical analysis and computer simulation analysis. The results shows that because of the presence of reinforcement, crack does not affect the barrier＇ s protective performance as the vertical continuous structure, although the concrete material discontinuity in the location of the crack, Therefore, crack will not affect the protective performance of single slop reinforced concrete bridge barrier. Eventu- ally, full-scale Impact test was adopted to verify, the results of the analysis.