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Identification method for prestressing loss of PC simply supported girder-bridge based on inverse analysis

A technology of simply supported girder bridges and identification methods, applied in bridges, bridge construction, bridge maintenance, etc., can solve the problems of difficult practical application, complex analysis process, long time-consuming, etc., and achieve important engineering practical value and accurate calculation results. Effect

Inactive Publication Date: 2017-05-24
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Application Information

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Problems solved by technology

However, the analysis process of this method is relatively complicated, time-consuming, limited by field conditions and indoor test conditions, and has limitations, and it is very difficult to apply in practice.

Method used

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  • Identification method for prestressing loss of PC simply supported girder-bridge based on inverse analysis
  • Identification method for prestressing loss of PC simply supported girder-bridge based on inverse analysis
  • Identification method for prestressing loss of PC simply supported girder-bridge based on inverse analysis

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Embodiment 1

[0046] A three-span prestressed concrete simply supported beam bridge (40.0m+40.0m+40.0m), the design standard is highway-I, the cross section is T-beam, the main beam concrete is marked with C50, and the prestressed steel is 15.24mm steel Stranded wire. Table 1 shows the measured deflection of the beam at different time points during the inversion calculation. The finite element model of beam prestress loss identification analysis figure 2 Shown.

[0047] Table 1

[0048]

[0049]

[0050] The inversion analysis of the deflection of the main section at different time points during the service period of the beam is carried out. The inversion result of the prestress loss of the beam is as follows Figure 3 to Figure 8 Shown.

[0051] Through analysis, it can be seen that with the continuous increase of beam deflection, the loss of beam prestress gradually increases. Corresponding to different observation time A, observation time B, observation time C, observation time D, observat...

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Abstract

The invention discloses an identification method for prestressing loss of PC simply supported girder-bridge based on inverse analysis, and belongs to technical field of in-service bridge virtual condition analysis. The identification method for prestressing loss of PC simply supported girder-bridge based on inverse analysis is precise and reliable, and can track andprecisely predict the prestressing loss of bridges in service. The identification method comprises the steps of establishing a finite element model, and adopting the prestressing loss of the PC simply supported girder-bridge as unknown parameter to be initiallyvectorized to carry out finite element analyzing and calculating; according to the result of finite element analyzing and calculating, performing back analysis calculation with a measured deflection value of a bridge body, calculating the objective function, and judging whether the objective function is convergence or not; if the objective function is convergent, outputting the result of prestressing loss of PC simply supported girder-bridge identification;if the objective function is not convergent, returning to the finite element model to carry out iterative calculation. The identification method provides calculable analysis parameters for prestressing loss identification of in0service prestressing bridge structure and damage evaluation, and has significant practical value in engineering.

Description

Technical field [0001] The invention specifically relates to a method for identifying the prestress loss of a PC simply-supported girder bridge based on back analysis, and belongs to the technical field of actual state analysis of a bridge in service. Background technique [0002] For PC concrete simply supported girder bridges that have been in service for many years, under the combined effects of vehicle load, temperature, concrete shrinkage and creep, the degree of degradation of the beam’s strength and stiffness has become more and more serious, and its safety, usability and durability have been Sex poses a serious threat. Through investigation, it is found that the main diseases of such bridges are the continuous appearance and expansion of cracks, and the phenomenon of deflection of beams is obvious. For this reason, scholars at home and abroad have conducted in-depth studies on such diseases. The analysis shows that the loss of beam prestress is one of the main factors t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50E01D22/00
CPCE01D22/00G06F30/13G06F30/23
Inventor 张兆宁李军君
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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