CN108931193B - A method of calculating bridge foundation sedimentation deformation by high-acruracy survey support deflection - Google Patents
A method of calculating bridge foundation sedimentation deformation by high-acruracy survey support deflection Download PDFInfo
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- CN108931193B CN108931193B CN201810635500.0A CN201810635500A CN108931193B CN 108931193 B CN108931193 B CN 108931193B CN 201810635500 A CN201810635500 A CN 201810635500A CN 108931193 B CN108931193 B CN 108931193B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
Abstract
The present invention provides a kind of methods that bridge foundation sedimentation deformation is calculated by high-acruracy survey support deflection, belong to technical field of bridge engineering.The compression stiffness value that support is measured in experiment is first passed through, the finite element model comprising support is then established according to design parameter.In finite element model, the generation unit sedimentation deformation of the pier footing at some support is enabled, other pier footing sedimentation deformations are zero, and the changing value for calculating the compression deformation of each support forms Influence of Displacement matrix, and finds out its inverse matrix.The deflection observation for causing each support of bridge due to constructing is measured by precise laser distance measuring instrument again, the inverse matrix of the influence matrix found out with front and the product of support deflection observation can calculate the position and settling amount that bridge foundation settles.The present invention passes through the deflection of measurement bridge pad, and inverse goes out position and the settling amount of bridge foundation sedimentation, and method is simple, and convenient for operation, theory is reliable.
Description
Technical field
The invention belongs to technical field of bridge engineering, are related to one kind by high-acruracy survey support deflection and calculate bridge
The method of beam foundation settlement displacement.
Background technique
When building the basis of subway or other engineering structures near built bridge, excavation pit will cause bridge
Basis occur sedimentation or sidesway, a degree of influence will cause on the safety of existing bridge.In order to guarantee the peace of bridge
Entirely, it needs to carry out high-precision measurement to the basis of bridge, only accurately measures the displacement of bridge foundation, meter can be passed through
The safety of bridge structure is evaluated in calculation.Currently used measurement method is directly to measure bridge pier using high-precision level
Settling amount, high-precision level theoretically can accurate 0.2mm can be because of environment but if carrying out long term monitoring
It influences or operator sets up the accidental error of measuring instrument every time and not can guarantee the precision of long term monitoring.
Summary of the invention
The invention proposes a kind of methods that bridge foundation sedimentation deformation is calculated by high-acruracy survey support deflection.
Technical solution of the present invention:
A method of calculating bridge foundation sedimentation deformation by high-acruracy survey support deflection, steps are as follows:
The compression stiffness value that support is measured in experiment is first passed through, the finite element mould comprising support is then established according to design parameter
Type.Assuming that bridge has n support, then the pier footing generation sedimentation deformation at support is expressed as motion vector: { Δ1, Δ2...
Δn}；
In finite element model, the sedimentation deformation that takes the pier footing at first support to generate: Δ1=1mm, other branch
The sedimentation deformation that pier footing at seat generates is zero, calculates the changing value of the compression deformation of each support:
The sedimentation deformation for taking the pier footing at i-th of support to generate: Δi=1mm, the pier footing at other supports produce
Raw sedimentation deformation is zero, calculates the changing value of the compression deformation of each support:
When calculating pier footing generation unit displacement (1mm) at all supports with same method, cause to own
The changing value of the compression deformation of support forms Influence of Displacement matrix A:
The each support of bridge near in Excavation Process is measured by precise laser distance measuring instrument (10 μm of precision) again
Deflection observation:
Next, with the inverse matrix inv (A) and support deflection observation of Influence of Displacement matrix AMultiplying is done, i.e., bridge base can be calculated using following formula
The position and settling amount that plinth settles:
Finally, foundation's settlement is inputted finite element analysis model, to assess the safety of entire bridge.
Effect and benefit of the invention:
1) by the deflection of measurement bridge pad, inverse goes out position and the settling amount of bridge foundation sedimentation, and method is simple,
Convenient for operation.
2) measurement of support deformation is the measurement of relative displacement, and measurement distance is close, and sensor setting is convenient, can be supervised for a long time
It surveys, than being easy to get higher precision directly against the method for pier footing measurement absolute displacement.
3) calculation method is reliable, and the precision of theoretical calculation is much higher than the precision measured, to ensure that the reliable of this method
Property.
Detailed description of the invention
Fig. 1 is a kind of method schematic diagram that bridge foundation sedimentation deformation is calculated by high-acruracy survey support deflection.
In figure: 1 No. 1 pier support；2 No. 2 pier supports；3 No. 3 pier supports；
4 No. 4 pier supports；5 No. 5 pier supports；6 No. 1 pier footings；7 No. 2 pier footings；
8 No. 3 pier footings；9 No. 4 pier footings；10 No. 5 pier footings；11 girders.
Specific embodiment
A specific embodiment of the invention is described in detail below in conjunction with technical solution and attached drawing.
The across footpath of four-span continuous beams beam is 30m+40m+50m+20m, first passes through support of the pressure testing machine to bridge with model
It is demarcated, measures the rigidity value of support；Then the finite element model comprising support is established according to design parameter, calculated each
Pier footing at support occurs to cause institute's backed deflection when unit displacement (1mm), forms Influence of Displacement matrix A；This
Example is four-span continuous beams beam, has 5 bridge piers, therefore obtain the Influence of Displacement matrix A of 5 × 5 ranks.Specific value is as follows:
The unit of data is micron in matrix.The measured value that one group of bridge pad deflection is obtained in construction, embodies
Are as follows:
It is calculated using formula (2), available { Δ }={ 0.000,25.000,0.000,4.000,17.000 }
(mm).The bridge pier for being determined that sedimentation deformation occurs for basis is respectively 2,4, No. 5 bridge piers, and displacement is respectively as follows: 25mm, 4mm,
17mm。
Claims (1)
1. a kind of method for calculating bridge foundation sedimentation deformation by high-acruracy survey support deflection, which is characterized in that first
The compression stiffness value that support is measured by testing establishes the finite element model comprising support according to design parameter, using finite element
Model calculates bridge foundation sedimentation deformation and causes the Influence of Displacement matrix of support deflection, and finds out its inverse matrix；Pass through again
Laser range finder measures the deflection observation for causing each support of bridge due to constructing, with the Influence of Displacement matrix found out
The position and settling amount that the product of inverse matrix and the deflection observation of support settles to get bridge foundation out；The meter
Calculating bridge foundation sedimentation deformation method, specific step is as follows:
The compression stiffness value that support is measured in experiment is first passed through, the finite element model comprising support is then established according to design parameter；
Assuming that bridge has n support, then the pier footing generation sedimentation deformation at support is expressed as motion vector: { Δ1, Δ2...
Δn}；
In finite element model, the sedimentation deformation that takes the pier footing at first support to generate: Δ1=1mm, at other supports
Pier footing generate sedimentation deformation be zero, calculate the changing value of the compression deformation of each support:
The sedimentation deformation for taking the pier footing at i-th of support to generate: Δi=1mm, what the pier footing at other supports generated
Sedimentation deformation is zero, calculates the changing value of the compression deformation of each support:
When obtaining the pier footing generation unit displacement 1mm at all supports with same method, cause the backed pressure of institute
The changing value of compression deformation amount forms Influence of Displacement matrix A:
The deflection observation of each support of bridge near in Excavation Process is measured by laser range finder again:
Next, with the inverse matrix inv (A) of Influence of Displacement matrix A and the deflection observation of supportMultiplication is done, i.e., bridge foundation is just calculated using following formula and occurs to sink
The position of drop and settling amount:
Finally, foundation's settlement is inputted finite element analysis model, to assess the safety of entire bridge.
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| CN109579785A (en) * | 2018-12-06 | 2019-04-05 | 成都钧功电子技术有限公司 | A kind of the monitoring system and data analysing method of building settlement |
| CN113465557B (en) * | 2021-07-22 | 2023-11-24 | 深圳市大升勘测技术有限公司 | Real-time monitoring method for overpass displacement |
| CN114877856B (en) * | 2022-07-13 | 2022-09-30 | 广东电网有限责任公司佛山供电局 | Method, system and equipment for monitoring morphology of GIL pipeline |
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| JP3119178B2 (en) * | 1996-11-15 | 2000-12-18 | 日立金属株式会社 | Processing control method of magnetic head |
| CN1949207A (en) * | 2005-10-14 | 2007-04-18 | 上海闵衡建筑检测研究所有限公司 | Settlement observation method by micro computer tada recording and tada processing |
| JP5013047B2 (en) * | 2006-03-07 | 2012-08-29 | 日立造船株式会社 | Correction method for displacement measurement using captured images |
| CN101813569B (en) * | 2010-03-31 | 2011-08-31 | 东南大学 | Health monitoring method for identifying damaged cable and support displacement based on strain monitoring |
| CN103268371B (en) * | 2013-04-26 | 2016-09-14 | 重庆交通大学 | A kind of bridge real time load recognition methods based on influence matrix |
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| CN106156501B (en) * | 2016-07-04 | 2018-07-31 | 厦门大学 | A kind of bridge local damage quantization method based on deflection line |
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| CN106777657B (en) * | 2016-12-12 | 2020-07-17 | 同济大学 | Method for arranging deformation monitoring points of tunnel passing through existing railway |
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