Method for arranging displacement measuring points

A layout method and displacement technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem of large relative errors in repeated layout of displacement measurement points, and achieve the effect of ensuring integrity, reliability and low cost

Active Publication Date: 2010-03-10
JSTI GRP CO LTD
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Problems solved by technology

[0010] The purpose of the present invention is to overcome the influence of factors such as personal subjective experience or completely based on theoretical calculations in the current measuring point layout scheme for construction monitoring of cable-stayed bridges, resulting in repeated arrangements of many displacement measuring points or large relative errors, etc. problem, a method for optimizing the layout of displacement measuring points for the construction monitoring of some cable-stayed bridges is proposed

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  • Method for arranging displacement measuring points

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Embodiment 1

[0023] Take a part of the cable-stayed bridge in Changzhou section of Changcheng Expressway as an example. The total length of the bridge is 260.3m, and the main bridge part adopts (70.15+120+70.15)m three-span double-tower single-cable-plane prestressed concrete tower-beam consolidation partial cable-stayed bridge. The main girder adopts a single-box three-chamber large cantilever variable-section prestressed concrete continuous box girder, which is divided into 59 beam sections, of which 0 # ,1 # and 1' # The length of the beam section is 12m, and the cast-in-place beam section is cast on the top of the pier and the temporary support beside the pier; the length of the cast-in-place beam section of the side span support is 9m, the length of the side and mid-span closing section is 2m, and the length of other beam sections is 3-5m, using hanging baskets Cantilever casting method construction.

[0024] Such as figure 1 As shown, the arrangement method of displacement measur...

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Abstract

The invention relates to a method for arranging displacement measuring points, comprising the following steps: establishing a finite element model and calculating theoretical values of the positions of displacement measuring points presenting a bridge state; fitting the theoretical values by adopting the polynomial of nonlinear least squares to obtain a regression equation; carrying out F detection and t detection on the regression equation, and selecting a regression curve with the best fitting as a theoretical value curve; abstracting a plurality of points from measured values of the displacement measuring points to form different groups, and then also fitting the points of each group to obtain a plurality of measured value curves; defining the closeness degree between the theoretical value curves and the measured value curves as Euclidean distance and Chebishov distance; calculating the Euclidean distance and the Chebishov distance of each measured value curve and theoretical valuecurve, and setting the maximum Chebishov distance; and under the condition of according with the deviation, analyzing and comparing the Euclidean distance values of each measured value curve and theoretical value curve so as to determine the best displacement measuring point arranging position.

Description

technical field [0001] The invention belongs to the field of bridges, and in particular relates to a method for arranging displacement measuring points used in the construction of partial cable-stayed bridges. Background technique [0002] Partial cable-stayed bridges (also known as low-tower cable-stayed bridges) are characterized by short towers, rigid beams, and concentrated arrangement of cables. It can be regarded as an external prestressed tendon, which bears a relatively small load ratio, and a considerable part of the load will be borne by the bending and shearing of the main beam. Due to this unique stress characteristic, some cable-stayed bridges have larger spanning capacity than girder bridges at the same girder height, and are more economical than cable-stayed bridges. [0003] The construction of bridge construction monitoring system includes the determination of monitoring content and measuring point layout. Displacement and deformation monitoring is to use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 张宇峰承宇徐剑马志国戴云峰
Owner JSTI GRP CO LTD
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