锈胀钢筋混凝土拱肋承载力试验与模拟

发布时间：2018-03-30 14:21

本文选题：桥梁工程　切入点：钢筋混凝土拱肋　出处：《工程力学》2017年03期

【摘要】：为研究锈胀损伤对钢筋混凝土拱肋极限承载力的影响,制作了4片钢筋混凝土圆弧拱肋,通过电化学快速锈蚀使其表面产生不同程度的锈胀裂缝,讨论了初始锈胀裂缝的分布情况,研究了锈胀拱肋的裂缝发展、不同位置处位移和应变、极限承载力及失效模式。试验结果表明:锈胀削弱了混凝土截面尺寸和刚度,降低了钢筋与混凝土间的粘结性,是承载力退化的主要原因之一;锈胀导致的拱肋极限承载力下降率约为60%;锈胀未改变拱肋的失效模式,所有拱肋均在一侧拱脚发生脆性破坏。在试验的基础上,建立了锈胀钢筋混凝土拱肋的有限元计算模型,由于RC拱肋存在大面积锈胀,模型中未考虑混凝土保护层的影响,计算结果和试验值较为接近,为日后有限元建模提供一定参考。
[Abstract]:In order to study the effect of corrosion expansion damage on the ultimate bearing capacity of reinforced concrete arch ribs, four reinforced concrete circular arch ribs were made. The distribution of initial rust expansion crack is discussed, and the crack development, displacement and strain at different positions, ultimate bearing capacity and failure mode of rust expansion arch rib are studied. The test results show that rust expansion weakens the size and stiffness of the section of concrete. Reducing the bond between steel bar and concrete is one of the main reasons for the degradation of bearing capacity; the reduction rate of ultimate bearing capacity of arch rib caused by rust expansion is about 60%; the failure mode of arch rib is not changed by rust expansion. All arch ribs have brittle failure at one arch foot. On the basis of test, the finite element calculation model of rust-expanded reinforced concrete arch rib is established. Due to the large area of rust expansion of RC arch rib, the influence of concrete protective layer is not considered in the model. The calculated results are close to the experimental values, which provides a certain reference for the finite element modeling in the future.
【作者单位】：长沙理工大学桥梁工程安全控制省部共建教育部重点实验室;
【基金】：国家重点基础研究发展计划(973计划)项目(2015CB057705) 国家自然科学基金项目(51508036,51478050) 土木工程优势特色重点学科创新性项目(15ZDXK05) 桥梁结构安全控制湖南省工程实验室开放基金项目(14KD15)
【分类号】：TU375

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