On the basis of test bridges externally prestressed strengthening applications of bridge engineering are introduced, Research results and problems that are hurried to be settled are discussed in felting prestressed researching field,Special characters of additional prestressed strengthening technology are summarized.

But the study on fixed concrete structures strengthened by external prestressing lacks of thorough research.

The study was carried out to further investigate the simply supported reinforced concrete beam strengthened by external prestressing through experiment and theory analysis.

Taking the reinforcement engineering of Hanjiang bridge in Guanmiao town of Ankang city for instance,the key technologies of every tache such as test,design,construction and monitoring of external prestressed reinforcement method of continuous rigid frame bridge are introduced,which accumulates valuable experiences for the reinforcement of long-span continuous rigid frame bridge.

SRAP external prestressed reinforcement is a new bridge reinforcement technology.

Electrochemical behaviour of LY12CZ under applied stress;

The applied stress effect on topological character of α2→O microstructure in Ti-25Al-10Nb (mole fraction / %) alloy is studied by phase field approach.