Abstract:This paper analyzes the mechanism of corrosion of prestressed concrete structure under crack condition, expounds the relationship between crack and its width and corrosion of prestressed reinforcement, and puts forward the time-dependent model of corrosion of prestressed reinforcement under general environmental conditions, which can be used as a reference for durability design.

Abstract:This paper discusses the phenomenon of web cracking of prestressed concrete box girder, seeks the method to avoid cracking, and improves the construction quality of vertical prestress, especially the quality of vertical grouting.

Abstract:In the scheme of symmetrical anchorage structure arrangement of cable-stayed bridge, besides the steel beam structure arrangement of cable anchorage, the design scheme of prestress plane arrangement of cable anchorage zone can also be adopted. This paper briefly introduces the design concept, structure, model design and test scheme of the latter arrangement.

Abstract:Prestressed concrete pylon is used widely in cable-stayed bridge in our country. In this paper, the finite element method is used to analyze the stress of the anchorage zone of the hollow prestressed concrete tower of the Ehuang Yangtze River Bridge. The mechanical characteristics of the structure are pointed out, and some suggestions for the design of similar structures are put forward.

Abstract:This paper introduces the application of finite element technology to simulate and analyze the stress state of the clamping piece, anchor plate, anchor plate, spiral reinforcement, connector and other components in the prestressed anchorage system and the stress state of the concrete under the anchor.

Abstract:This paper introduces the external prestressing reinforcement of box girder of a bridge in Shenzhen Expressway, and expounds the application and effect of external prestressing in bridge reinforcement.

Abstract:In this paper, four kinds of cement mortar are selected (one kind of 45kg grade sulphoaluminate self-stressing cement mortar, one kind of ordinary portland cement mortar, two kinds of ordinary portland cement mortar with different amount of UEA swelling agent) as matrix, three kinds of steel fiber The effects of matrix parameters and steel fiber shape on the interfacial bonding properties between steel fiber and cement mortar are analyzed. the bond-slip mechanism between shear straight steel fiber and steel fiber with hooks at both ends (bekaert and harrix steel fiber) and matrix is discussed. the load-displacement curves of straight steel fiber and steel fiber with hooks are compared and studied

Abstract:This paper is translated from "The Construction Outline of Steel Fiber Reinforced Shotcrete" made by Japan Civil Society, and mainly introduces the mix proportion and performance of steel fiber reinforced shotcrete.

Abstract:This paper introduces the application technology of fly ash in prestressed concrete and some results of performance research.

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