选用的塑料纤维应具有不同的极限拉应变和弹性模量，纤维可以为碳纤维、芳纶纤维、玻璃纤维等。
The plastic fiber selected has different ultimate tensile strain and elastic modulus, and the fiber can be carbon fiber, aramid fiber, glass fiber and the like.
针对混凝土构件材料强度和变形性质的随机性，采用数学方法提出构造混凝土极限拉应变数列的原理。
Considering the randomness of strength and deformation of concrete material, a mathematic approach of producing random variables series of concrete ultimate tensile strain is proposed.
同时，根据本文试验结果、已有试验结果和国内外设计规范（规程）给出了碳纤维布的容许极限拉应变的建议表达式。
Simultaneously, the propositional expression of allowable ultimate strain of CFRP was given based on the author's and the existing experiments.
单拉预应变路径将显著提高正应变比区的成形极限，而对负应变比区的成形极限影响不大。
Uniaxial prestrain will obviously improve the forming limit on positive strain ratio zone, while it has little effect on negative strain ratio zone.
等双拉预应变将明显降低正应变比区的成形极限，对负应变比区的成形极限有所提高。
Equiaxial prestrain will obviously decrease the forming limit on positive strain ratio zone, while it slightly improves the forming limit on negative strain ratio zone.
当配筋特征值不大于0.2时，承载能力极限状态下碳纤维片材的拉应变可以接近或超过允许拉应变，因此可以有效地对受弯构件正截面承载力进行加固；
When the ratio not more than 0.2, CFRP tensile strain can reach or exceed the permissible strain at ultimate capacity state, and therefore CFRP can work efficiently.
当配筋特征值不大于0.2时，承载能力极限状态下碳纤维片材的拉应变可以接近或超过允许拉应变，因此可以有效地对受弯构件正截面承载力进行加固；
When the ratio not more than 0.2, CFRP tensile strain can reach or exceed the permissible strain at ultimate capacity state, and therefore CFRP can work efficiently.
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