酸雨环境下腐蚀预应力混凝土结构抗震性能研究

Prestressed concrete has become a very important engineering materials because of it can improve the crack resistance and stiffness of engineering members. However, prestressed concrete structure members will undertake the in using load, the wind, snow ,ice , explosion and earthquake loads, and also may be affected by corrosion environment during the service Process. China is not only an earthquake-prone area but also a acid- rain-frequent area. Therefore, the study on the seismic properties of prestressed concrete under acid rain environment, has great academic value and practical significance in improving the safety and durability of prestressed concrete structure. This project will take the prestressed concrete members under acid rain enivronment as the object of study. And use exposure test and indoor accelerated simulation test, combining the theoretical analysis and the computer simulation combined with the synthetic study method.Research on the basic mechanical properties of corrosion prestressed steel under acid rain environment. Obtain the load-displacement curves, hysteretic curves, skeleton curves, energy dissipation capacity, stiffness and strength degradation of corrosion prestressed concrete members, and determine the restoring force model. To provide theoretical and experimental experience for the design and maintenance of corrosion prestressed concrete structure under acid rain environment.

预应力混凝土由于可提高构件的抗裂度和刚度等优点，已成为工程中十分重要的材料。然而预应力混凝土结构构件在服役过程中，除了承受使用荷载，还受到如大风、冰雪、爆炸和地震等偶然作用，同时还有可能受到腐蚀环境的影响。我国大部地区为酸雨区，同时又是地震多发区，研究酸雨环境下预应力混凝土结构的抗震性能，对保证预应力混凝土结构的安全性与耐久性具有十分重要的意义。 本项目拟以酸雨环境下预应力混凝土构件为研究对象，拟采用室外暴露试验与室内加速腐蚀试验相结合、理论分析与计算机模拟相结合等研究方法，研究酸雨环境下腐蚀预应力钢筋的力学性能，腐蚀预应力混凝土构件荷载-位移关系，滞回曲线、骨架曲线、耗能能力、刚度和承载力退化情况，确定酸雨环境下腐蚀预应力混凝土构件恢复力模型。为酸雨环境下腐蚀预应力混凝土结构的设计及后期维护提供理论基础和试验依据。

预应力混凝土虽然具有很多优点，然而预应力混凝土结构构件在服役过程中，除了承受使用荷载，还受到如大风、冰雪、爆炸和地震等偶然作用，同时还有可能受到腐蚀环境的影响。研究酸雨环境下预应力混凝土结构的抗震性能，对保证预应力混凝土结构的安全性与耐久性具有十分重要的意义。本项目以模拟酸雨腐蚀环境下预应力混凝土构件为研究对象，采用模拟酸雨环境腐蚀试验及理论分析分析方法，研究了模拟酸雨环境下腐蚀预应力钢筋的力学性能退化规律，与混凝土粘结性能退化情况，腐蚀过程中钢绞线的腐蚀形态及蚀坑的分布规律；腐蚀预应力混凝土受弯构件静载作用下的力学性能变化规律，腐蚀预应力构件抗震性能演变过程，提出了酸雨腐蚀后预应力构件的承载力计算方法，得到了酸雨环境下腐蚀预应力混凝土构件滞回曲线、骨架曲线、耗能能力、刚度和承载力退化情况。为酸雨环境下腐蚀预应力混凝土结构的设计及后期维护提供理论基础和试验依据。