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Simply supported steel box girder prestressing cable shape optimizing method

A technology of prestressed tendons and steel box girders, applied in bridges, bridge materials, bridge construction, etc., can solve problems such as structural cracking, instability, and complex structural mechanics analysis

Inactive Publication Date: 2015-11-11
YANCHENG INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, according to the existing literature, there is no systematic research on the selection of prestressed tendons, so the role of prestressed tendons has not been fully utilized. However, due to the extensive application of prestressed steel box girders at this stage, the research and invention is more necessary
However, due to the influence of the shear lag effect, the mechanical analysis of this type of structure becomes more complicated. Compared with the concrete box girder bridge, the girder wall of the prestressed steel box girder is thinner, so it may be possible not to carry out a more detailed mechanical analysis on it. It will cause local cracking and local instability of this type of structure, or more serious bridge diseases

Method used

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  • Simply supported steel box girder prestressing cable shape optimizing method
  • Simply supported steel box girder prestressing cable shape optimizing method
  • Simply supported steel box girder prestressing cable shape optimizing method

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Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1: as figure 2 , Figure 5 As shown, the geometric parameters and material parameters of the steel box girder are: t 1 = t 2 = t 3 = 3 mm; t 4 =4mm; b=0.25m; αb=0.25m; H=0.4m; L=5m; E=2.01×10 5 Mpa; G=7.9×10 4 Mpa, and the prestressing force of each prestressing tendon is 50KN, where E 1 ;F 1 ;G 1 and E 2 ;F 2 ;G 2 are stress measurement points or calculation points, respectively. Finally, according to the applied prestressing force and different reinforcement methods, different pre-camber and different flange stress distribution forms can be obtained, and the optimal prestressed tendon layout line can be obtained accordingly.

[0052]The main purpose of the arrangement of prestressed tendons is to make the bridge structure obtain proper pre-camber and pre-stress, so that the structure has good mechanical properties. The steel box girder is a thin-walled structure with unique mechanical properties. effect, the distribution of the normal stress o...

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Abstract

The invention discloses a simply supported steel box girder prestressing cable shape optimizing method. By introducing a thin-walled box girder theory, the method is more accurate in mechanical analysis; compared with a traditional prestressing cable shape, the dual effects of obtaining pre-camber and exerting prestress can be well achieved. Due to the arrangement of optimized prestressing cables, a box girder is in a better mechanical state, and therefore bad damage such as girder box cracks and local instability can be easily avoided, and the durability of the structure is improved. Meanwhile, the method is clear in mechanical concept, simple in calculation and wide in application prospect and practical value. By means of the method, the mechanical performance of the box girder can be optimized, and the steel material consumption can be further saved.

Description

technical field [0001] The invention relates to a method for optimizing the line shape of prestressed tendons of simply supported steel box girders. Background technique [0002] Prestressing technology is widely used in modern structural engineering, especially bridge engineering. Prestressed steel box girder is mainly a composite structure formed by setting external curved prestressing tendons in the steel box. For steel box girders, the introduction of prestressing tendons is extremely It greatly improves the mechanical properties of the structure, improves the spanning capacity of the bridge, and can save about 30% of steel compared with ordinary steel structures. Stressed steel box girder. The layout of prestressed tendons is mainly internal prestressed tendons and external prestressed tendons. Internal prestressed tendons are mainly used in concrete bridges, while external prestressed tendons are mostly used in bridge maintenance and reinforcement and prestressed stee...

Claims

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Application Information

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IPC IPC(8): E01D2/04E01D101/28
Inventor 甘亚南石飞停
Owner YANCHENG INST OF TECH
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