桥梁抗震性及耐久性设计实例研究

Case Study on Durability & Seismic Resistance Design of Bridge

桥梁的抗震性和耐久性设计直接关系到桥梁的使用安全和使用寿命。某B类桥梁抗震设防措施按照Ⅷ度地震烈度区设防,桥涵结构物需进行抗震设计。同时基于100年设计基准期,为了使桥梁在预期作用和预定的维护条件下,能在规定期限维持其设计性能,对桥梁进行了耐久性设计,提出了该桥梁的抗震性和耐久性设计技术措施以及相关注意事项。工程实践效果表明,通过采取增加结构的阻尼或利用桥墩的延性消耗地震能量,以及提高结构混凝土标号等措施可以有效地满足桥梁抗震及耐久性要求。

Seismic resistance and durability of bridge design is directly related to the safety and the service life of the bridge. In this paper, seismic fortification measures of a B-class bridge is adopted in accordance with 8 degree earthquake, and the seismic design of the bridge structure must be done. At the same time, based on 100 years of design reference period, in order to make the bridge keep its design performance in the condition of expected effect predetermined constraints within the prescribed time limit, the durability of bridge is designed, and the technical measures and the relevant matters needing attention are put forward. The effect of engineering prac-tice shows that the requirements on earthquake resistance and durability of bridge can be met by such as consuming the energy of earthquake by increasing the damping of the structure or utilize the pier＇s elevate the grade of concrete or other measures. measures