| 1. | Strength classes grades of prestressed tendon
预应力筋强度等级30 |
| 2. | Relaxation of prestressed tendon
预应筋松弛31 |
| 3. | Quality control for tensioning of prestressed tendons of concrete hollow slab
混凝土空心板预应力筋张拉的质量控制 |
| 4. | Before the steel yields , the stress increment of prestressed tendons changes approximately linearly with the incremental load
钢梁屈服之前，预应力筋的应力增量与外荷载增量近似成线性关系。 |
| 5. | The authors provides a new method named limitation coefficient of tension stress method , which can calculate the quantity of prestressed tendons , taking the prestressing secondary moment into account
本文提出了计算预应力筋数量的“拉应力限制系数法”这一概念，并由之推导了考虑预应力次弯矩的计算公式。 |
| 6. | Using this method , pcf can automatically fulfill the requirements of crack - controlling , and unifies the calculating method of the quantity of prestressed tendons under different crack - controlling
Pcf采用了该方法，能根据结构的使用性能要求，主动进行抗裂设计，并对不同抗裂等级构件取得了统一的计算方法。 |
| 7. | On the basis of analyzing effect of prestressed tendon layout on internal force and thrust at springer , the principle of prestressed iendon layout for three - span prestressed concrete deck arch bridge is illustrated
摘要在分析预应力布置位置对三跨上承式拱桥内力和拱脚推力影响的基础上，阐明了该类桥型预应力筋的布置原则。 |
| 8. | Based on the theories of chemistry and ahsking structure , the corrosion and damage mechanism of externally prestressed tendons was addressed and the impact of vibration frequency of externally prestressed tendons on normal use of concrete beams was analyzed
摘要运用化学及结构振动原理，阐述了体外预应力筋腐蚀破坏机理，分析了体外预应力筋振动频率对梁正常使用的影响。 |
| 9. | Combined with that the influence of the prestressed tendon layout on mechanics characteristic of three - span prestressed concrete deck arch bridge is taken into account in these methods , and demand of internal force and displacement in design is satisfied by using upward and downward eccentric layout of prestressed tendon
这些设计法针对该类桥型的特点，利用在拱顶梁中分别布置一定数量的上下偏心的预应力筋来优化结构的内力和满足各部分的位移限制要求。 |
| 10. | Deformations , curvatures , strains of the beams and the stress increments of unbonded prestressed tendons were measured and the crack distribution and failure models were observed . the bearing capability and ductility of unbonded partially prestressed concrete beams were deeply analyzed
在试验中，量测了梁的变形、曲率、应变、无粘结筋的应力增量等关键数据，观察了梁的裂缝分布、破坏形态，并对无粘结部分预应力混凝土梁的承载能力、延性等基本力学性能进行了较为深入的分析。 |
