英文翻译

Analysis of Prestressed Consolidation Technology Applied To Composite Truss Arch Bridge

Abstract: The common deterioration of composite trussed arch bridges is introduced and the characteristics of main strengthening methods are detailed. The deflection and the variation of stress caused by external prestressing is emphatically analyzed in the case, which indicates that the external prestressing is a more reasonable and feasible way in preventing the crack and improving the stress state of the inclined bar, but poor in the improvements of the solid section。 Key words:Truss Arch Bridge; Deterioration; Prestress; Consolidation；

1 summarize This bridge form first applied in trussed combination arch bridge in our country, it is a good combination of truss bridge and arch bridge of the respective advantages. Has a strong spanning ability, construction is convenient, beautiful, etc. Since birth in the 1960 s, our country has built 41 trussed combination arch bridge, once used widely because of its obvious advantages, for the social and economic development made a positive contribution. After entering the 21st century, with the rapid development of economy, the further growth of traffic volume, trussed combination arch bridge, though still plays an important role, but a lot of trussed combination arch bridge appeared more severe disease, is necessary to reinforce the maintenance in time. 2 the main disease of trussed combination arch bridge From this article, based on western science and technology project "diseases.it trussed combination arch bridge and the study of strengthening methods of investigation and research, the common diseases of trussed combination arch bridge are mainly lack of concrete cracking, steel corrosion and overall stiffness, etc. Look from the distribution of disease location, mainly in top chord and bottom chord, solid web section, vertical and diagonal, embodied in the component cracking (see figure 2.1) integrity is poor and joint, joint quality is bad, one of the diagonal ring to cracking and solid edge of abdominal segment of transverse cracking performance is very outstanding and common (investigation of all 34 bridge in chongqing, guizhou fish hole along the creek bridge bridge wait 15 bridge all exist this kind of disease), is one of the major problems of this kind of Bridges need urgently to solve. 3 Commonly used method in the application of the applicability of trussed combination arch bridge The bridge reinforcement is generally based on component to improve the performance of the reinforcement and structure of the bridge to restore or improve the bearing capacity and crack resistance, to extend its service life. The strengthening methods mainly include replacement concrete reinforcement method, increasing section method, seismic reinforcement method, plus the prestressed reinforcement method, pasting steel plate reinforced method, paste fiber composite reinforcement method and high performance composite cement mortar steel mesh reinforcement method, etc. According to the specific disease characteristics of trussed combination arch bridge, combined with the analysis of the various reinforcement methods applied occasion of trussed combination arch bridge disease commonly used generalize and analyze the applicability of the solution, as shown in table 3.1. Figure 2.1 typical diseases distribution of trussed combination arch bridge Table 3.1 of trussed combination arch bridge strengthened with that of the strengthening methods applied in table v

部位 加固方法 上弦 实腹段 下弦 竖杆 斜杆 腹板 顶板 底板 腹板 顶板 底板

增大截面加固法 √ √ √ √ √ √ 置换混凝土加固法 √ √ 外包钢加固法 √ √ 粘贴钢板加固法 √ √ √ √ √ 粘贴纤维复合材加固法 √ √ √ √ √ 高性能水泥复合 砂浆钢筋网加固法 √ √ √ √ √

体外预应力加固法 √ √ √ 注：√表示适用。 Based on the actual bridge reinforcement design for the analysis of prestressed

diagonal ring technology solution to the cracking and the feasibility of the real edge of abdominal segment transverse cracking problem. 4 Prestressed reinforcement of trussed combination arch bridge structure performance impact analysis Because of the typically prestressed concrete trussed combination arch bridge from the structure to the stress and the disease has the very strong regularity during use, therefore, recognition and related analysis results of concrete Bridges tend to other bridge has a strong guiding significance. To the ministry of communications under the western science and technology project "diseases.it trussed combination arch bridge and the study of strengthening methods of your flower fish hole road bridge reinforcement project calculation and analysis, for example, to analyze the feasibility of this kind of bridge with prestressed strengthening technique. 4.1The main parameters calculation 4.1.1Main girder cross section geometric parameters Flower fish's hole bridge, the bridge is 290 m, bridge structure arrangement is 5 x 15 m + 150 m + 4 x 15 m prestressed concrete trussed combination arch bridge main span of rise-span ratio of 1/8, the deck all 12 m wide. 4.1.2The analysis process and calculation model Dr Bridge system 3.03 software is used to establish plane calculation model (see figure 4.1) to carry out the relevant analysis and research. According to the requirements of the mechanical calculation, a total of two full bridge model is established, one is the implementation of reinforcement scheme before the original