混凝土桥梁开裂机理和防裂措施研究

随着港区内桥梁建设日益发展和高性能混凝土广泛应用,桥梁混凝土开裂问题越来越引起重视。在桥梁工程设计中往往提出混凝土连续浇筑等特殊要求,导致桥梁工程中很多采用高墩、大跨结构,从而使温度控制和防止裂缝问题成为桥梁设计和施工过程中必须重点考虑的问题之一。主要结合实际工程中桥梁的设计与施工实践,利用有限元分析混凝土桥梁开裂机理,并研究混凝土桥梁温度场和温度应力特点,为桥梁工程混凝土开裂提供有效的防护措施。

Cracking mechanism and prevention of concrete bridges

With the development of harbor bridge construction and wide application of high-performance concrete,the cracking of concrete bridges is attracting more and more attentions.The special requirements in bridge engineering design are often put forward,such as concrete continuous casting,and this lead to a lot of high pier and large-span bridge engineering structures,so that the temperature control and crack prevention become one of the key problems in the bridge design and construction.Combining with the practice of bridge design and construction,and applying FEM simulation and visual programming technologies,this paper analyzes the temperature and stress fields of some concrete bridges,makes relatively systematical and in-depth study on the cracking mechanism and prevention measures for the bridge concretes.