本欧洲标准中所考虑应用的预应力是高强度钢材(钢丝，钢绞线或钢柱)制造的钢筋束。
P The prestress considered in this Eurocode is applied by tendons made of high-strength steel (wires, strands or bars).
针对工程实践中常用的预应力钢束布置形式，推导了预应力钢筋回缩影响长度的数值解法和预应力等效荷载的一般计算式。
Based on the general case of tendons used in practice, the formulas for calculating the extent owing to the anti-friction effects and the prestressing equivalent loads are derived.
现有有限元数值分析方法在单元划分时，要求预应力钢筋单元与混凝土单元节点必须重合，这对曲线布束的箱梁很难满足这一要求。
Generated a finite element mesh in existence numerical method, node superposition of concrete and reinforcement element is difficult to curved tendon box girder.
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