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Damaged prestressed concrete flexural member decompression moment test method

A technology for decompressing bending moment and bending members, which is applied in the direction of applying stable bending force to test the strength of materials, to achieve the effect of improving sensitivity, clear mechanical concept and strict logic

Inactive Publication Date: 2015-09-02
SHANXI PROVINCIAL RES INST OF COMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since this method adopts the traditional test bending moment-fiber stress increment method in the tension area, it is generally only possible to carry out indoor loading tests on uncracked new beams, but it is helpless for cracked flexural members.

Method used

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  • Damaged prestressed concrete flexural member decompression moment test method
  • Damaged prestressed concrete flexural member decompression moment test method
  • Damaged prestressed concrete flexural member decompression moment test method

Examples

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Embodiment 1

[0023] A damaged prestressed concrete bending member pressure relief bending moment test system, the system includes a bridge 1, a vertical load application device 2, a surface strain gauge 3 and a data acquisition instrument 4, the vertical load application device 2 is arranged on On the cracking section to be detected of the bridge 1; the surface strain gauge 3 is installed on one side of the tension zone of the cracking section of the bridge 1 to be detected, specifically on the outer edge longitudinal reinforcement surface after the concrete of the reinforced protective layer is chiseled; the data collection The instrument 4 is connected to the surface strain gauge 3 through wires; the surface strain gauge 3 is a steel bar surface strain gauge; the vertical load applying device 2 is a live load; the vertical load applying device 2 is a jack.

[0024] The implementation method of the damage prestressed concrete bending member pressure relief bending moment test system accord...

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Abstract

The invention belongs to the technical field of bridge structural engineering, and in particular relates to a damaged prestressed concrete flexural member decompression moment test method. A damaged prestressed concrete flexural member decompression moment test system adopted by the method comprises a bridge, a vertical load applying device, a surface strain gauge and a data acquisition instrument, wherein the vertical load applying device is arranged on a to-be-detected cracking section of the bridge; the surface strain gauge is installed on the surface of outer edge reinforcement without reinforcement cover concrete at a tensile area of the to-be-detected cracking section of the bridge; the data acquiring instrument is connected with the surface strain gauge through a conductor. Compared with the prior art, the damaged prestressed concrete flexural member decompression moment test method is simple to operate, accurate and reliable in result, easily mastered by engineering technicians, and is suitable for detecting and evaluating the cracked prestressed concrete flexural member decompression moment.

Description

technical field [0001] The invention belongs to the technical field of bridge structure engineering, and in particular relates to a pressure-relieving bending moment test method for damaged prestressed concrete bending members. Background technique [0002] Prestressed concrete bridges often have many vertical cracks near the mid-span section due to uncertain factors such as construction quality and overload during later operation. Due to the accumulation of bridge damage, the structure will redistribute the force of the longitudinal bridge inward, and the stress state in the section will also change. The cross-section decompression bending moment of a prestressed concrete bridge refers to the bending moment that needs to be applied when the existing effective pre-compression stress of the outermost fiber of the concrete in the pre-compression zone of the cross-section is offset to zero under the existing effective pre-stress of the cross-section. The cracking bending momen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/20
Inventor 韩之江郭文龙刘志华赵雷汪永强郭学兵申雁鹏吕立宁赵文溥王磊毛敏何国花傅莉陈栋栋谢立安卢鹏寇伟赵学峰刘媛媛赵芳
Owner SHANXI PROVINCIAL RES INST OF COMM
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