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中文摘要：
钢筋锈蚀是影响混凝土结构耐久性最重要的因素。钢筋锈胀体积膨胀，对周围混凝土产生压力，继而导致保护层的受拉开裂，出现锈胀裂缝，这对结构整体的安全性和耐久性十分有害。研究混凝土锈胀裂缝的抑制措施，对提高结构的耐久性具有重要意义。从结构构造人手，以快速通电加速纵向钢筋锈蚀的方法，研究了混凝土保护层厚度和箍筋间距对混凝土构件锈胀开裂的影响；同时通过计算机仿真，对试验构件进行了数值试验。在此基础上，建立了构件表面应力与混凝土保护层厚度及箍筋间距的相关关系，得到了不同保护层厚和箍筋间距对试件表面锈胀裂缝的影响规律。
英文摘要：
Corrosion of steel bar is the most important factor that influences the endurance of reinforcement concrete structure. Rust expansion of steel bar can bilge the volume and exert pressure to concrete around. Afterwards the concrete cover split open by tension and rust expansion cracks appear ,which is very harmful to the endurance and safety of the whole structure. Study on restraining measures of concrete rust expansion cracks has an important significance in improving the durability of structure. This research started from the bridge structure. Changing the coyer thickness and stirrup spacing and adopting constant current method for accelerating the corrosion of longitudinal reinforcement, this paper researches the influence of cover thickness and stirrup spacing on the rust expansion cracks. Results show that increasing cover thickness can effectively reduce the rust expansion of specimens and de- creasing the stirrup spacing can effectively restrain or delay the longitudinal cracks from specimen surface. In the meantime, through numerical experiments, this paper verifies the correctness of the relationship, establishes the correlationship between specimen surface stress and that including concrete cover thickness and stirrup spacing.
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