A Method for Separating Stress-Dependent Crack Widths of Reinforced Concrete Girder Bridges in Service

A technology for reinforced concrete beams and crack widths, which is used in the analysis of materials, the use of sonic/ultrasonic/infrasonic waves to analyze solids, instruments, etc. It can solve the problems that the real stress state of the structure cannot be accurately evaluated, and the crack width of the overall structure cannot be reflected.

Active Publication Date: 2019-06-07
BEIJING MUNICIPAL ENG RES INST
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Problems solved by technology

[0004] The invention relates to a method for separating stress-related crack widths of reinforced concrete girder bridges in service, which aims to solve the technical problems that the overall structural crack width obtained by the traditional on-site test method cannot reflect the real stress state of the structure and cannot accurately evaluate the bearing capacity of the structure

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  • A Method for Separating Stress-Dependent Crack Widths of Reinforced Concrete Girder Bridges in Service
  • A Method for Separating Stress-Dependent Crack Widths of Reinforced Concrete Girder Bridges in Service
  • A Method for Separating Stress-Dependent Crack Widths of Reinforced Concrete Girder Bridges in Service

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Embodiment Construction

[0059] This separation method for the stress-related crack width of reinforced concrete girder bridges in service, through the actual measurement of the beam bottom crack width and spacing characteristic values ​​of the reinforced concrete beam mid-span area under the action of self-weight, including the measured maximum crack width w g，max , Measured average crack width w g，m and the measured average crack spacing l m ;Evaluate the measured maximum crack width w g，max Whether it meets the design or specification requirements, and the evaluation ends if the requirements are met; if it is not satisfied, the overall flexural crack width is divided into stress-related crack width w c and free deformation crack width w z ; For the convenience of analysis, the stress-related crack width w c Divided into short-term maximum crack width under dead weight w ej and long-term stress-dependent crack width w f The mid-span area of ​​reinforced concrete beams is divided into c...

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Abstract

The invention relates to a separation method for in-service reinforced concrete beam bridge stress related crack width. The method includes: conducting actual measurement on the characteristic indexes of bending cracks in an in-service bridge under the self-weight action, and performing nondestructive testing of concrete material performance, then separating stress related crack width Wc and free deformation crack width Wz according to structural analysis, and further separating long-term stress crack width Wf from the stress related crack width Wc. The method provided by the invention solves the technical problems that the overall structure crack width obtained by the traditional field testing method cannot reflect the true stress state of the structure and the structural-load-carrying capacity cannot be assessed accurately.

Description

technical field [0001] The invention relates to the technical field of engineering detection, in particular to a method for separating stress-related crack widths of reinforced concrete girder bridges in service. Background technique [0002] After several years of service, reinforced concrete bridges are affected by the external environment, overloading factors, natural disasters, etc., and inevitably produce structural damage, resulting in the expansion of structural cracks and the decrease of stiffness. Engineering practice and design experience show that the expansion of structural cracks is an important factor affecting the nonlinear response of concrete structures. The expansion depth and opening displacement are important indicators for evaluating the safety of structures, and even control the structure in some cases. Therefore, The design codes and inspection codes for concrete bridges in various countries have given the limit requirements for the width of structural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N29/04
CPCG01N29/04G01N2291/0232G01N2291/02827G01N2291/0289G01N2291/0421
Inventor 钟铭叶英
Owner BEIJING MUNICIPAL ENG RES INST
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