预应力钢束附近的局部混凝土缺陷及其影响

讨论预应力钢束附近的局部混凝土缺陷产生的原因及缺陷对结构正常使用性能和耐久性的不利影响。以30m简支T梁为例，用有限元数值方法分析钢柬附近局部混凝土缺陷对结构受力性能的影响。分析结果表明，缺陷会使局部范围内的应力明显增加，局部缺陷发展为病害的可能性大大增加。

Defects of Local Concrete Next to Prestressed Steel Bundle and Influences

This paper discusses the causes of defects of local concrete next to the prestressed steel bundle and the adverse effects on the normal application performance and durability of structure. Taking the 30m simply supported T beam as an example, the paper analyzes the influences of the defects of local concrete next to the steel bundle on the stress performance of structure by means of the finite element numerical method. The results of analysis show that the defects will obviously increase the stress in local range, and thus the possibility of local defects that may develop into the damage is greatly increased.