| Abstract | 第4页 |
| Introduction | 第7-8页 |
| 1 Structural forms of superstructures under railways | 第8-19页 |
| 1.1 Plate girder superstructures made by steel concrete | 第11-13页 |
| 1.2 Plate girder superstructures made by pre-stressed concrete | 第13-15页 |
| 1.3 The way of developing of structural forms and reinforcing of superstructures | 第15-19页 |
| 2. Stress condition of pre-stressed concrete superstructure (computer modeling) | 第19-25页 |
| 2.1 Calculation of the main beam | 第19页 |
| 2.2 Publisher's imprint | 第19页 |
| 2.3 Definition efforts | 第19-23页 |
| 2.4 Computer simulation | 第23-25页 |
| 3 Calculation of main girder with mixed reinforcement with replacement of high-strength upper cable to steel reinforcing rod with farther anchor reinforcement in compressed zone ofconcrete | 第25-82页 |
| 3.1 Tensioned reinforcement beams replacement of superstructure to reinforcement barclass А-III | 第25-46页 |
| 3.1.1. Beam replacement No 5 | 第25-30页 |
| 3.1.2 Replacement of beams No 5 and No 4 | 第30-36页 |
| 3.1.3 Beam replacement No 5, No 4 and No 3 | 第36-41页 |
| 3.1.4 Replacement of full upper range of beams | 第41-46页 |
| 3.2 Replacement of tensioned reinforcement beams of superstructure to reinforcementbar class А-IV | 第46-76页 |
| 3.2.1 Replacement of beam No 5 | 第46-54页 |
| 3.2.2 Replacement of beams No 5 and No 4 | 第54-61页 |
| 3.2.3 Beam replacement No 5, No 4 and No 3 | 第61-68页 |
| 3.2.4 Replacement of full upper range of beams | 第68-76页 |
| 3.3 Crack growth calculation | 第76-78页 |
| 3.4 Conclusion | 第78-82页 |
| 4 Calculation of main girder with mixed reinforcement with replacement of high-strengthlower cable to steel reinforcing | 第82-118页 |
| 4.1 Replacing the hard reinforcement beams of the superstructure on the reinforcing rodsClass A-IV | 第82-113页 |
| 4.1.1. Replacement of secondary beams №1 | 第82-89页 |
| 4.1.2 Replacing the lower beams №1 | 第89-97页 |
| 4.1.3 Replacing the lower beams №1 and №2 | 第97-105页 |
| 4.1.4 Replacement of the entire bottom row | 第105-113页 |
| 4.2 Crack growth calculation | 第113-118页 |
| 5 Calculation of main girder with mixed reinforcement with distribution steel reinforcementto working reinforcement | 第118-125页 |
| 5.1 Replacing the beams of the pre-stressing steel reinforcement of the span onreinforcing rod A-IV class | 第118-125页 |
| 5.1.1. Replacement of the secondary beams №1 | 第118页 |
| 5.1.2. Selection of the section area of the reinforcing rod | 第118-120页 |
| 5.1.3. Calculation of the beams on the resistance to the moment of flection | 第120-121页 |
| 5.1.4 The plot Building materials and determination of the geometric characteristicsof the section | 第121页 |
| 5.1.5. Cracking resistance calculation of the standard sections | 第121-122页 |
| 5.1.6 The Calculation for the forming cracks on the compressing and expandingstresses at the stage of exploitation | 第122-125页 |
| Application А | 第125-129页 |
| 1.Partial compression | 第125-126页 |
| 2.Change in the geometry of the section | 第126-129页 |
| Conclusion | 第129-130页 |
| Acknowledgement | 第130-131页 |
| References | 第131-134页 |
| 攻读学位期间的研究成果 | 第134页 |
