Abstract:The cable-stayed cable of reinforced concrete structure has high flexibility. The permanent effectiveness of cable stays can be addressed. The strength, fatigue strength, and corrosion protection requirements they must meet vary, and so do their prices. This paper introduces their weaknesses and improvements in order to obtain a unified evaluation standard.

Abstract:In this paper, the deformation of surrounding rock caused by the pulling force on the inner head of the ground anchor is analyzed, and the integral equation expression and numerical solution of the internal force distribution and transfer law of the anchor head considering the interaction between the anchor rod, the slurry and the surrounding rock are given.

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Abstract:The concept and method of external prestressing originated from France, but the early external prestressing system was not perfect, and there were defects in corrosion resistance, protection and structure. Therefore, the application of external prestressing in engineering can not show its superiority, which once made this technology stagnant. However, with the rapid development of unbonded prestressing and staying cables, the application of external prestressing system has brought vitality, especially in the last two decades, external prestressing system has been applied in a large number of projects abroad. The following are some representative projects in the development process of external prestressing system to illustrate, in order to have a further understanding of external prestressing.