CN107246035B - A kind of main pier concrete pile foundation breakdown diagnosis method of bridge spanning the sea - Google Patents
A kind of main pier concrete pile foundation breakdown diagnosis method of bridge spanning the sea Download PDFInfo
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- CN107246035B CN107246035B CN201710589781.6A CN201710589781A CN107246035B CN 107246035 B CN107246035 B CN 107246035B CN 201710589781 A CN201710589781 A CN 201710589781A CN 107246035 B CN107246035 B CN 107246035B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/42—Foundations for poles, masts or chimneys
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Abstract
The invention belongs to Bearing Capacity of Pile Foundation analysis technical fields, and in particular to a kind of main pier concrete pile foundation breakdown diagnosis method of bridge spanning the sea, the present invention is by setting the damage index of pile foundation, and by curvature under pile foundation damage index and each state of pile foundationWith the curvature under pile body limiting damage stateBetween ratioAnd constant 1 is compared, and delimits pile foundation damage index according to comparison result, the determination of damage index considers the influence of the multiple factors such as moment of flexure, shear span ratio, axial compression ratio, ripping circular saw, volume distributed ratio, and analysis result is objective, accurate.
Description
Technical field
The invention belongs to Bearing Capacity of Pile Foundation analysis technical fields, and in particular to a kind of main pier concrete-pile of bridge spanning the sea
Basic breakdown diagnosis method.
Background technology
Concrete component micromechanism of damage is more complicated, is influenced by multiple factors, and domestic and foreign scholars propose different damages
Analysis model mainly determines component damage index in terms of deformation and energy consumption two, is continuously improved by scholars and perfect, right
Structural dynamic breakdown diagnosis needs the joint in terms of maximum distortion and accumulation energy consumption two to consider more really reflect structure
Damage status.In view of the uncertainty of bridge spanning the sea main pier foundation material parameter and geometric dimension, according to clump of piles single pile by
Power deformation analysis, pile foundation sectional curvature can represent pile foundation stress deformation and be damaged to the mechanical characteristic for destroying overall process.
Invention content
The over strait big of pile foundation degree of injury can be determined the object of the present invention is to provide a kind of by pile foundation sectional curvature
The main pier concrete pile foundation breakdown diagnosis method of bridge.
To achieve the above object, the present invention provides following technical schemes：A kind of main pier concrete pile foundation of bridge spanning the sea
Breakdown diagnosis method, includes the following steps：
Step 1：Concrete pile foundation breakdown diagnosis model is established, the damage index D of i-th of pile foundation is seti, and make：
In above formula：
β is combination parameter, β=(- 0.447+0.073 λ+0.24n0+0.314ρt)×0.7ρω；
- stake end section surveys curvature；
Curvature when-pile body concrete cracking, i.e. concrete reach curvature when concrete tensile strength standard value；
Curvature under-pile body concrete limiting damage state, i.e. concrete reach song when ultimate compressive strain of concrete
Rate；
∫ d ε-are the accumulation hysteretic energy of CYCLIC LOADING；
M-stake end section moment of flexure；
λ-shear span ratio；
n0- axial compression ratio；
ρt- ripping circular saw, ρt0.75% is taken as when ＜ 0.75%；
ρω- volume distributed ratio；
Step 2：Set curvature under each state of pile foundationWith the curvature under pile body limiting damage stateBetween
RatioAnd constant 1 is as damage index DiComparison reference value；WhereinFor pile foundation
Concrete reaches curvature when tensile strength design value,For pile foundation section yield curvature, i.e. pile foundation reinforcing bar reaches reinforcing bar tension
The curvature of pile foundation when strength standard value；
Step 3；The damage index D of pile foundation will be testediIt is compared with the comparison reference value, and is drawn according to comparison result
Determine the degree of injury of pile foundation, degree of injury includes with stage further：
It is intact：
Slightly：
It is medium：
Seriously：
It destroys：Di≥1.0。
The technical effects of the invention are that：The present invention by set pile foundation damage index, and by pile foundation damage index with
Curvature under each state of pile foundationWith the curvature under pile body limiting damage stateBetween ratioAnd constant 1 is compared, and pile foundation damage index, damage index delimited according to comparison result
Determination consider the influences of the multiple factors such as moment of flexure, shear span ratio, axial compression ratio, ripping circular saw, volume distributed ratio, analysis result
It is objective, accurate.
Description of the drawings
Fig. 1 is the pile foundation degree of injury division figure of the present invention；
Fig. 2 is the B10 pier clump of piles stake floor plans that the embodiment of the present invention is provided；
Fig. 3 is the single-pile foundation reinforcement constitution figure that the embodiment of the present invention is provided；
Fig. 4 is the EI Centro seismic wave time-histories figures that the embodiment of the present invention is provided；
Fig. 5 is that the embodiment of the present invention is providedCurve (N=100000N).
Specific implementation mode
The present invention is described in detail below in conjunction with attached drawing.
In view of the uncertainty of bridge spanning the sea main pier foundation material parameter and geometric dimension, become according to clump of piles single-pile stress
Conformal analysis, pile foundation sectional curvature can represent pile foundation stress deformation and be damaged to the mechanical characteristic for destroying overall process, this research
It is proposed that pile foundation lesion curvature analysis model is as follows on the basis of the two-parameter damage model of Park and Ang：
β=(- 0.447+0.073 λ+0.24n0+0.314ρt)×0.7ρω
In formula：DiThe damage index of-i-th pile foundation；
- stake end section curvature；
Curvature when-pile body concrete cracking, i.e. concrete reach curvature when concrete tensile strength standard value；
Curvature under-pile body concrete limiting damage state, i.e. concrete reach song when ultimate compressive strain of concrete
Rate；
β-combination parameter；
∫ d ε-are the accumulation hysteretic energy of CYCLIC LOADING；
M-stake end section moment of flexure；
λ-shear span ratio；
n0- axial compression ratio；
ρt- ripping circular saw, ρt0.75% is taken as when ＜ 0.75%；
ρω- volume distributed ratio；
This research is on the basis of having achievement in research, according to each stage stress damage characteristic of pile foundation and test result by stake
Base degree of injury is divided into 5：Intact, slight, medium, serious, destruction, it is specific as follows：
It is intact： ForWhen corresponding pile foundation curvature, i.e. pile foundation concrete reaches anti-
Curvature when tensile strength design value indicates that concrete reaches concrete tensile strength design value and corresponds to strain；
Slightly： ForCorresponding curvature,For
Concrete reaches concrete tensile strength standard value and corresponds to strain；
It is medium： ForCorresponding curvature, i.e. pile foundation reinforcing bar reach reinforcing bar
The curvature of pile foundation when tensile strength standard value,Reach the strain under Steel Bar Tensile Strength standard value for reinforcing bar
(being calculated by Seismic Design of Highway Bridges detailed rules and regulations (JTG/T B02-01-2008) Appendix B .0.1)；
Seriously： For εc=εcuCorresponding curvature, εc=εcuReach the concrete limit for concrete
The corresponding strain of compressive strain (being calculated by Seismic Design of Highway Bridges detailed rules and regulations (JTG/T B02-01-2008) Appendix B .0.2)；
It destroys：Di≥1.0
Pile foundation degree of injury quantitative description is shown in Table 1.
1 pile foundation degree of injury quantitative description of table
Technical scheme of the present invention is described further below in conjunction with specific embodiment：
1. project profile
The Beijing Institute of Aeronautics bridge of Construction of Hangzhou Bay Cross-sea Bridge is the cable-stayed bridge in the double rope faces of a double tower, overall length of bridge 908m, across footpath group
It is combined into 70m+160m+448m+160m+70m, as shown in Fig. 2, the brill of 26 diameter 3.1m as shown in Figure 3 is arranged under main pier bottom
Hole pouring pile basis, the long 125m of average stake, cushion cap are hexagon rounded corner monoblock type cushion cap, and size is 48.5 × 23.7 × 6.0m
[97].A single pile carries out stress breakdown diagnosis among main pier B10 multi-column pier foundations are chosen in this research.
2. foundation of main pylon damages force analysis
This research carries out calculating analysis using MidasCivl softwares to case history, complete Construction of Hangzhou Bay Cross-sea Bridge it
The main pier earthquake motion time history analyses of Beijing Institute of Aeronautics bridge B10, establish computation model, cast material characteristic is as shown in table 2.
2 cast material characteristic of table
Basic earthquake intensity is VI degree, and design is set up defences by VII degree, and seismic time history analysis uses EI Centro seismic wave moulds
It is quasi-, see Fig. 4.
It is obtained by model analysisCurve is shown in Fig. 5.Bridge spanning the sea main pier foundation be vertically primarily subjected to the dead weight of main pier, on
Portion's structure dead load and mobile load are to simplify the calculation unifiedly calculated mobile load by dead load, because mobile load accounting example is smaller in this way in damage point
Axle power N may be considered constant constant value suffered by analysis pile foundation top surface, using result of calculation according to damage modelThe corresponding damage index D of every pile base can be calculatedi, the main pier stake of this bridge
Base each pile foundation stress deformation under horizontal earthquake action is consistent, therefore need to only calculate the damage index D of a pile foundationi, by meter
Calculate to obtain main pier foundation entirety damage index D=DiCorresponding table 1 can determine the corresponding degree of injury of damage index.
ForCorresponding curvature, is computed
According to《Seismic Design of Highway Bridges detailed rules and regulations》B.0.1-2, (JTG/T B02-01-2008) formula obtains：
In formula：φyPile foundation section yield curvature (1/m)；
εyThe yield strain of reinforcing bar；
D-pile foundation diameter of section (m).
According to《Seismic Design of Highway Bridges detailed rules and regulations》B.0.2-1, B.0.2-1 (JTG/T B02-01-2008) formula obtains with formula：
φu=min (φu1,φu2)=0.0608
In formula：φuPile foundation section limit curvature (1/m)；
P-pile foundation section vertical load (kN)；
f′cConcrete crushing strength standard value (kN/m2)；
AgPile foundation area of section (m2)；
εsSteel ultimate pulling strain can use εs=0.09；
εcuThe compressive ultimate strain of confined concrete can be calculated as follows：
ρsConstrain the volume reinforcement ratio of reinforcing bar；
fkhStirrup tensile strength standard value (kN/m2)；
f′ccThe peak stress (kN/m2) of confined concrete；
The reduction limiting strain of reinforcing bar is constrained,
The main pier pile foundation of this bridge each pile foundation stress deformation under horizontal earthquake action is consistent, therefore need to only calculate pile foundation
Damage index.
According to damage model
Main pier foundation entirety damage index D=Di=0.23
ByTabling look-up 1 can determine the corresponding damage journey of the damage main pier
Degree is medium.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (1)
1. a kind of main pier concrete pile foundation breakdown diagnosis method of bridge spanning the sea, it is characterised in that：Include the following steps：
Step 1：Concrete pile foundation breakdown diagnosis model is established on the basis of two-parameter damage model based on Park and Ang,
Set the damage index D of i-th of pile foundationi, and make：
In above formula：
β is combination parameter, β=(- 0.447+0.073 λ+0.24n0+0.314ρt)×0.7ρω；
- stake end section surveys curvature；
Curvature when-pile body concrete cracking, i.e. concrete reach curvature when concrete tensile strength standard value；
Curvature under-pile body concrete limiting damage state, i.e. concrete reach curvature when ultimate compressive strain of concrete；
∫ d ε-are the accumulation hysteretic energy of CYCLIC LOADING；
M-stake end section moment of flexure；
λ-shear span ratio；
n0- axial compression ratio；
ρt- ripping circular saw, ρt<0.75% is taken as when 0.75%；
ρω- volume distributed ratio；
Step 2：Set curvature under each state of pile foundationWith the curvature under pile body limiting damage stateBetween ratio
ValueAnd constant 1 is as damage index DiComparison reference value；WhereinFor pile foundation concrete
Reach curvature when tensile strength design value,For pile foundation section yield curvature, i.e. pile foundation reinforcing bar reaches Steel Bar Tensile Strength mark
The curvature of pile foundation when quasi- value；
Step 3；The damage index D of pile foundation will be testediIt is compared with the comparison reference value, and stake delimited according to comparison result
The degree of injury of base, degree of injury include with stage further：
It is intact：
Slightly：
It is medium：
Seriously：
It destroys：Di≥1.0。
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| CN109724887A (en) * | 2019-02-14 | 2019-05-07 | 重庆交通大学 | The RC bridge pier earthquake proof performance analysis method that cyclic loading is coupled with chloride ion corrosion |
| CN109724886A (en) * | 2019-02-14 | 2019-05-07 | 重庆交通大学 | The RC bridge pier antiseismic performance analysis system that cyclic loading is coupled with chloride ion corrosion |
| CN110487574B (en) * | 2019-08-28 | 2021-04-13 | 湘潭大学 | Beam structure damage identification method based on inclination angle influence line curvature |
| CN111985032B (en) * | 2020-08-20 | 2022-08-26 | 哈尔滨工业大学 | Method for judging earthquake failure mode of pile foundation |
| CN112989586B (en) * | 2021-03-04 | 2022-09-23 | 四川大学 | Method for judging failure mode of reinforced concrete hollow pier stud |
| CN113076586B (en) * | 2021-04-19 | 2022-05-24 | 华南理工大学 | Anti-seismic analysis method for application performance feedforward centralized plastic hinge unit |
| CN115840984B (en) * | 2023-02-17 | 2023-05-23 | 石家庄铁道大学 | Tunnel structure damage performance calculation method and device and terminal equipment |
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| CN102409705A (en) * | 2011-09-22 | 2012-04-11 | 深圳思量微系统有限公司 | System for monitoring and pre-warning pile foundation damage in real time |
| RU2502847C1 (en) * | 2012-06-04 | 2013-12-27 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Кубанский государственный технологический университет" (ФГБОУ ВПО "КубГТУ") | Method to determine bearing capacity of pile |
| CN102855219A (en) * | 2012-09-13 | 2013-01-02 | 同济大学 | Highway bridge seismic vulnerability analysis method on basis of ANN (artificial neural network)-MC (Monte Carlo)-UD (uniform design) methods |
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| CN104652497B (en) * | 2014-12-26 | 2016-03-30 | 交通运输部公路科学研究所 | A kind of concrete in water pile foundation breakdown diagnosis evaluation method |
| CN105064420A (en) * | 2015-08-06 | 2015-11-18 | 交通运输部天津水运工程科学研究所 | High-pile wharf foundation pile damage diagnosis method based on structural residual modal force |
| CN105651823B (en) * | 2015-12-30 | 2018-04-10 | 河海大学 | The underwater arrangement apparatus of Wharf Foundation Pile damage check instrument, detection means and method |
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