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由于部分予应力兼有全予应力混凝土和钢筋混凝土两种结构的优越性,能较好地控制使用条件下的裂缝,又不产生在强大予加力下的纵向水平裂缝,还可有效地控制挠度与在持续压力下引起的徐变上拱度,并有良好的延性、抗震性和弹性工作性能,同时可节省高强钢材,造价低、施工简便。更可贵的是可以充分发挥其结构及工艺特性、广泛应用于旧桥技术改造工程中。自四十年代起,许多国家做了大量部分予应力试验桥,并将部分予应力纳入其桥梁设计规范中,1970年国际予应力协会和欧洲混凝土委员会(FIP—CEB)上、将部分予应力混凝土列入其“混凝土结构设计与施工建议”中,已成为加筋混凝土系列中发展的
Because part of the prestress has both the advantages of full prestressed concrete and reinforced concrete structure, can better control the cracks under the conditions of use, but also does not produce a strong vertical force to force the horizontal cracks, but also can effectively control Deflection and creep camber caused by continuous pressure, good ductility, shock resistance and flexible working performance, high strength steel can be saved at the same time, the construction cost is low and the construction is simple. More valuable is that it can give full play to its structure and process characteristics, widely used in the Old Bridge technology renovation project. Since the 1940s, many countries have done a large number of prestressed test bridges and incorporated some of their stress into their bridge design codes. In 1970, the International Continuing Association and European Concrete Commission (FIP-CEB) The inclusion of concrete in its “Design and Construction of Concrete Structures” has become a development in reinforced concrete