CN112726685B - Existing structure system pile foundation bearing capacity detection and durability evaluation method - Google Patents
Existing structure system pile foundation bearing capacity detection and durability evaluation method Download PDFInfo
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Abstract
The invention discloses a method for detecting bearing capacity and evaluating durability of a pile foundation of an existing structure system, which comprises the following steps of: providing a plurality of excitation devices which are arranged in a distributed mode in the system and a plurality of displacement response acquisition sensors which are arranged at multiple points in the system; the multiple excitation devices synchronously excite the structure-pile foundation system to generate vertical vibration, and multiple displacement response acquisition sensors acquire multipoint displacement responses in the structure system; and the acquired structural displacement response of each point is used for system parameter inversion calculation, the pile foundation bearing capacity and the structural material modulus are calculated according to the inverted system parameters related to the pile foundation, and the structural durability is evaluated based on the material modulus attenuation rule. The method can realize nondestructive testing of the bearing capacity of the pile foundation of the structural systems such as bridges, buildings and the like and durability evaluation of the structural systems under the normal operation condition of the structural systems.
Description
Technical Field
The invention relates to a method for detecting bearing capacity and evaluating durability of a pile foundation of an existing structure system.
Background
After existing structure pile foundation operation certain time, because its bearing capacity can be influenced to ageing, the corruption etc. of pile foundation system material itself, the pile foundation bearing capacity also can be influenced to the change of pile foundation surrounding ground environment moreover, so need regularly detect and aassessment to it. In addition, because the existing reconstruction and extension projects are numerous, the reconstruction and extension projects are often connected with the existing structure, and the construction and operation of the existing structure have important influence on the safe operation of the existing structure, the bearing capacity and the safety of the pile foundation system of the existing structure need to be evaluated in advance so as to provide a reasonable safety protection scheme and measures for the existing structure.
However, the existing structural pile foundation system bearing capacity and durability evaluation has the following difficulties: (1) the existing structure is in an operation state, and the safe operation of the existing structure and the building is not influenced in the detection and evaluation process; (2) the pile foundation is provided with a bearing platform and other upper structures on the upper part, and the existence of the upper structures makes the bearing capacity detection and evaluation method for acceptance of the just constructed pile foundation difficult to implement or greatly influences the reliability of the detection result.
The existing detection and evaluation technology of the structural pile foundation system cannot meet the requirements.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a method for detecting the bearing capacity and evaluating the durability of the pile foundation of the existing structural system.
Aiming at the purposes, the invention adopts the following technical scheme:
a method for detecting bearing capacity and evaluating durability of an existing structure system pile foundation comprises the following steps:
providing a plurality of excitation devices which are arranged in a distributed mode in the system and a plurality of displacement response acquisition sensors which are arranged at multiple points in the system;
the multiple excitation devices synchronously excite the structure-pile foundation system to generate vertical vibration, and multiple displacement response acquisition sensors acquire multipoint displacement responses in the structure system;
and the acquired structural displacement response of each point is used for system parameter inversion calculation, the pile foundation bearing capacity and the structural material modulus are calculated according to the inverted system parameters related to the pile foundation, and the structural durability is evaluated based on the material modulus attenuation rule.
Furthermore, the vibration excitation devices are installed at different positions and synchronously excite the structure-pile foundation system to generate forced vertical vibration, the amplitude is controlled within a millimeter range, and the structure system is limited within the limit of safety and no influence on normal operation.
Further, the excitation devices are controlled to be at the same frequency and the same phase angle, so that the synchronism of excitation of the excitation devices is ensured, and only vertical excitation is generated.
Furthermore, the displacement response acquisition sensor is arranged on a pile foundation, a bearing platform, a pier, an upper structure, a beam or a plate in the system according to the structural vibration characteristics, and acquires the time course curve of the displacement response of each point synchronously along with the system vibration.
Further, the system parameters are determined by performing inversion calculation through the following dynamic inversion equation of the existing structure-pile foundation system parameters:
wherein the displacement (delta) and velocity of each point
Acceleration of a vehicle
The displacement response acquisition sensor acquires the displacement response; the exciting force { F } is exerted by an exciting device; quality matrix [ M ]]According toDetermining the geometrical parameters and mass density of the structure; stiffness parameter matrix [ K ]]And damping parameter matrix [ C ]]It is determined by the inversion calculation.
Further, the system parameter dynamic inversion equation divides a large-scale structure into different parts according to the structural characteristics of the large-scale structure to establish the divided parts, and the influence of the vibration participation quality of the structure of the adjacent part is taken into account according to the displacement distribution characteristics of the structural vibration.
Further, for the existing bridge large-scale structure, the mass of the bridge deck between the excitation pier and the non-excitation pier is distributed according to the proportion of the centroid position of the displacement distribution diagram, wherein the excitation pier is a pier provided with an excitation device, and the non-excitation pier is a pier not provided with an excitation device.
Further, the rigidity parameter related to the pile foundation in the system parameters is displacement generated by the pile foundation under unit load, so that a load-displacement equation is determined, and the bearing capacity of the pile foundation is determined from the load-displacement equation according to the allowable displacement of the pile foundation.
Further, the structural material in the structural material modulus comprises a reinforced concrete structural material or a steel structural material, and the structural material modulus is determined according to the inverted rigidity parameter and the structural section geometric parameter.
Further, in: and determining the structural material modulus attenuation rule by comparing the initial value and the detection value of the structural material modulus acceptance check, and evaluating the durability of the structural system according to the structural material modulus attenuation rule and the durability evaluation standard.
The beneficial effects of the invention include: the method can realize nondestructive testing of the bearing capacity of the pile foundation of the structural systems such as bridges, buildings and the like and durability evaluation of the structural systems under the normal operation condition of the structural systems.
Drawings
FIG. 1 is a schematic perspective view of an existing bridge structure;
FIG. 2 is a schematic side view of an existing bridge structure and an enlarged view of a portion A of the existing bridge structure;
FIG. 3 is a schematic view of the existing building structure and a schematic view of the existing building structure at a part B;
FIG. 4 is a schematic diagram of bridge deck displacement distribution of an existing bridge excitation span;
FIG. 5 is a simplified schematic diagram of the structure of FIG. 4;
fig. 6 is a diagram showing the centroid position of the displacement profile according to fig. 4.
The reference numbers illustrate: 100. existing bridge structures; 200. existing building structures; 300. the existing bridge large-scale structure; 1. a bridge deck isolation belt; 2. protecting the fence; 3. a bridge deck; 4. a capping beam; 5. a bridge pier; 6. an excitation device; 7. a soil body; 8. a bearing platform; 9. a pile foundation; 10. tying a beam; 11. a sensor; 12. a superstructure; 13. a base plate; 14. laminating the board; 15. a pile end spring-damper; 16. pile side spring-damper; 17. a cushion cap spring-damper; 18. a tie beam spring-damper; 19. floor spring-damper.
Detailed Description
For a better understanding of the objects, structure, features, and functions of the invention, reference should be made to the drawings and detailed description that follow.
As shown in fig. 2 and fig. 3, an embodiment of the present invention provides a method for detecting bearing capacity and evaluating durability of a pile foundation of an existing structural system, including the following steps:
and S1, providing a plurality of excitation devices 6 which are installed in a distributed mode in the system and a plurality of displacement response acquisition sensors 11 which are installed at multiple points in the system.
And S2, synchronously exciting the structure-pile foundation system by the multiple excitation devices 6 to generate vertical vibration, and acquiring multipoint displacement response in the structure system by the multiple displacement response acquisition sensors 11.
And S3, using the acquired structural displacement response of each point for system parameter inversion calculation, calculating the bearing capacity of the pile foundation 9 and the structural material modulus according to the inverted system parameters related to the pile foundation 9, and evaluating the structural durability based on the material modulus attenuation law.
The existing structural system may be the existing bridge structure 100, the existing building structure 200, or other existing structure.
As shown in fig. 1 and 2, in some embodiments, the existing structure is an existing bridge structure 100. The existing bridge structure 100 may include pile foundations 9 (which may also be referred to as a pile foundation), a cap 8 connected above the pile foundations 9, tie beams 10 for connecting adjacent cap 8, piers 5 (which may also be referred to as cap posts) connected above the cap 8, cap beams 4 connected above the piers 5, bridge decks 3 connected above the cap beams 4, guard rails 2 connected to both sides above the bridge decks 3, and deck isolation strips 1 connected to the middle above the bridge decks 3. The position of the platform 8 may be lower than the position of the soil mass 7. Based on the characteristics of the existing bridge structure 100, the end of the pile foundation 9 is equivalent to being connected with the pile end spring-damper 15, the side of the pile foundation 9 is equivalent to being connected with the pile side spring-damper 16, the bottom of the bearing platform 8 is equivalent to being connected with the bearing platform spring-damper 17, and the bottom of the tie beam 10 is equivalent to being connected with the tie beam spring-damper 18.
For existing bridge structures 100, excitation devices 6 may be mounted to the cap 8 to excite the structure-pile system to vibrate. The structure above the platform 8 may be referred to collectively as a bridge superstructure. The structure-pile foundation system of the existing bridge structure 100 may include piers 5, a cap 8, and pile foundations 9. The displacement response collecting sensor 11 may be installed at the pile foundation 9, the cap 8, the pier 5, the cap 4, the tie beam 10 or the bridge deck 3 in the system according to the vibration characteristics of the existing bridge structure 100.
As shown in fig. 3, in some embodiments, the existing structure is an existing building structure 200. Existing building structure 200 may include pilings 9 (or referred to as pilings), a floor 13 connected above pilings 9, a superstructure 12 connected above floor 13, and deck plates 14 arranged in tiers in superstructure 12. For existing building structures 200, excitation devices 6 may be mounted to floor 13 or deck 14 to excite the structure-pile system to vibrate. The structure-pile system of the existing building structure 200 may include a pile 9, a floor 13 or deck 14, a superstructure 12. The displacement responsive acquisition sensors 11 may be mounted to the pilings 9, floor 13, superstructure 12 or decks 14 depending on the vibration characteristics of the existing building structure 200. Based on the characteristics of the existing building structure 200, the end of the pile foundation 9 is equivalent to being connected with the pile-end spring-damper 15, the side of the pile foundation 9 is equivalent to being connected with the pile-side spring-damper 16, and the bottom of the floor 13 is equivalent to being connected with the floor spring-damper 19.
The vibration excitation device 6 is a vertical power loading device, and the corresponding part is promoted to vibrate through power loading. The vibration excitation device 6 is used for loading vertical power, so that the structural system vibrates vertically. The excitation device 6 can be installed at different positions of the system and synchronously excites the structure-pile foundation system to generate forced vertical vibration, the amplitude is controlled within a millimeter range, and the structure system is limited within the limit of safety and no influence on normal operation, so that the nondestructive detection of the bearing capacity of the pile foundation of the structure systems such as bridges and buildings and the durability evaluation of the structure systems can be realized under the normal operation condition of the structure systems.
The synchronism of the excitation devices 6 and the generation of only vertical excitations can be ensured by controlling the excitation devices 6 at the same frequency and at the same phase angle.
The displacement response acquisition sensor 11 can be installed on a pile foundation 9 (including pile groups), a bearing platform 8, a pier 5 (including bearing platform columns), an upper structure 12 (including an upper structure of an existing bridge structure 100 or an upper structure 12 of an existing building structure 200), a beam (including a capping beam 4, a tie beam 10 or a beam in an existing building structure of an existing bridge structure 100) or a plate (including a bridge deck 3 of the existing bridge structure 100 or a bottom plate 13 and a laminated plate 14 of the existing building structure 200) in the system according to the structural vibration characteristics, and synchronously acquires time-course curves of displacement responses of each point along with the system vibration.
The system parameters are determined by the following dynamic inversion equation of the existing structure-pile foundation system parameters:
wherein the displacement (delta) and velocity of each point
Acceleration of a vehicle
Collected by the displacement response collecting sensor 11; the exciting force { F } is applied by the exciting device 6Adding; quality matrix [ M ]]Determining according to the structure geometric parameters and the mass density; stiffness parameter matrix [ K ]]And damping parameter matrix [ C ]]It is determined by the inversion calculation.
In some embodiments, the stiffness parameter [ K ] corresponds to K1, K2, K3 … … and the damping parameter [ C ] corresponds to η 1, η 2, η 3 … …, i.e. the pilings, caps, tie beams or floors of the structural system may be equivalent to the connection with the spring-damper 15.
The rigidity parameter [ K ] related to the pile foundation 9 in the system parameters is the displacement generated by the pile foundation 9 under unit load, so that a load-displacement equation can be determined, and the bearing capacity of the pile foundation is determined from the load-displacement equation according to the allowable displacement of the pile foundation.
The structural material in the structural material modulus may comprise a reinforced concrete structural material or a steel structural material, i.e. the structural material modulus may be a reinforced concrete structural material modulus or a steel structural material modulus. The modulus of the structural material is determined according to the inverted stiffness parameter [ K ] and the geometric parameter of the structural section.
In the figure, EI represents bending stiffness, where E represents the material elastic modulus and I represents the second moment of area.
And determining the structural material modulus attenuation rule by comparing the initial value and the detection value of the structural material modulus acceptance check, and evaluating the durability of the structural system according to the structural material modulus attenuation rule and the durability evaluation standard.
In some embodiments, for a large structure, the system parameter dynamic inversion equation may be established by dividing the large structure into different parts according to the structural characteristics of the large structure, and the influence of the vibration mass of the structure in the adjacent part is taken into account according to the displacement distribution characteristics of the structural vibration.
For example, as shown in fig. 4, 5 and 6, for an existing bridge large structure 300, the vibration mass can be distributed according to the proportion of the centroid position of the displacement distribution diagram according to the mass of the bridge deck between a vibration excitation pier and a non-vibration excitation pier, wherein the vibration excitation pier is a pier provided with a vibration excitation device, the non-vibration excitation pier is a pier not provided with a vibration excitation device, namely the vibration excitation pier is a pier capable of vibrating, and the non-vibration excitation pier is a pier which does not vibrate. An excitation span is formed between the excitation pier and the non-excitation pier, and a non-excitation span is formed between the non-excitation pier and the non-excitation pier or other non-excitation pivots. The excitation span can be distributed with displacement according to the characteristics of the existing bridge large-scale structure.
The above detailed description is only for the purpose of illustrating the preferred embodiments of the present invention, and not for the purpose of limiting the scope of the present invention, therefore, all equivalent technical changes that can be made by applying the present invention are included in the scope of the present invention.
Claims (10)
1. A method for detecting bearing capacity and evaluating durability of a pile foundation of an existing structure system is characterized by comprising the following steps:
providing a plurality of vibration excitation devices which are installed on an existing structure in a distributed mode and a plurality of displacement response acquisition sensors which are installed at multi-point positions of the existing structure;
the multiple excitation devices synchronously excite the structure-pile foundation system to generate vertical vibration, and multiple displacement response acquisition sensors acquire multipoint displacement responses in the structure system, wherein the displacement responses comprise displacement, speed and acceleration of each point;
and the acquired structural displacement response of each point is used for system parameter inversion calculation, the pile foundation bearing capacity and the structural material modulus are calculated according to the inverted system parameters related to the pile foundation, and the structural durability is evaluated based on the material modulus attenuation rule.
2. The existing structural system pile foundation bearing capacity detection and durability evaluation method according to claim 1, wherein: the vibration excitation devices are installed at different positions and synchronously excite the structure-pile foundation system to generate forced vertical vibration, the amplitude is controlled within a millimeter range, and the structure system is limited within the limit of safety and no influence on normal operation.
3. The existing structural system pile foundation bearing capacity detection and durability evaluation method according to claim 1, wherein: the synchronous excitation of the excitation devices is ensured and only vertical excitation is generated by controlling the excitation devices to be at the same frequency and the same phase angle.
4. The existing structural system pile foundation bearing capacity detection and durability evaluation method according to claim 1, wherein: the displacement response acquisition sensor is arranged on a pile foundation, a bearing platform, a pier, an upper structure, a beam or a plate in the system according to the structural vibration characteristics, and acquires the time-course curve of displacement response of each point synchronously along with the system vibration.
5. The existing structural system pile foundation bearing capacity detection and durability evaluation method according to claim 1, wherein: the system parameters are determined by the following dynamic inversion equation of the existing structure-pile foundation system parameters:
wherein the displacement (delta) and velocity of each point
Acceleration of a vehicle
The displacement response acquisition sensor acquires the displacement response; the exciting force { F } is exerted by an exciting device; quality matrix [ M ]]Determining according to the structure geometric parameters and the mass density; stiffness parameter matrix [ K ]]And damping parameter matrix [ C ]]It is determined by the inversion calculation.
6. The existing structural system pile foundation bearing capacity detection and durability evaluation method according to claim 5, wherein: the system parameter dynamic inversion equation is used for establishing the sub-parts of the large-scale structure by dividing the large-scale structure into different parts according to the structural characteristics of the large-scale structure, and the influence of the vibration participating quality of the structure of the adjacent part is taken into account according to the displacement distribution characteristics of the structural vibration.
7. The existing structural system pile foundation bearing capacity detection and durability evaluation method of claim 6, wherein: for the existing bridge large-scale structure, the mass of the bridge deck between the excitation pier and the non-excitation pier is distributed according to the proportion of the centroid position of the displacement distribution diagram, wherein the excitation pier is a pier provided with an excitation device, and the non-excitation pier is a pier not provided with an excitation device.
8. The existing structural system pile foundation bearing capacity detection and durability evaluation method according to claim 1, wherein: and in the system parameters, the rigidity parameter related to the pile foundation is the displacement generated by the pile foundation under unit load, so that a load-displacement equation is determined, and the bearing capacity of the pile foundation is determined from the load-displacement equation according to the allowable displacement of the pile foundation.
9. The existing structural system pile foundation bearing capacity detection and durability evaluation method according to claim 1, wherein: the structural material in the structural material modulus comprises a reinforced concrete structural material or a steel structural material, and the structural material modulus is determined according to the inverted rigidity parameter and the structural section geometric parameter.
10. The existing structural system pile foundation bearing capacity detection and durability evaluation method according to claim 1, wherein: and determining the structural material modulus attenuation rule by comparing the initial value and the detection value of the structural material modulus acceptance check, and evaluating the durability of the structural system according to the structural material modulus attenuation rule and the durability evaluation standard.
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| JP2003194636A (en) * | 2001-12-27 | 2003-07-09 | Mitsubishi Electric Corp | Dynamic loading device for pile, dynamic loading method for pile and dynamic loading test method |
| CN104652501B (en) * | 2015-02-11 | 2016-11-16 | 交通运输部公路科学研究所 | The reflection wave method device and method of exciting in the inspecting hole of stake side |
| CN105926687B (en) * | 2016-05-03 | 2017-12-15 | 交通运输部公路科学研究所 | The method for determining vertical bearing capacity is loaded using thin tail sheep |
| CN110132512B (en) * | 2019-05-30 | 2020-09-22 | 山东省建筑科学研究院有限公司 | Bridge structure monitoring and evaluating method based on girder rigidity attenuation law |
| CN111611697B (en) * | 2020-05-13 | 2023-04-28 | 北京铁科工程检测有限公司 | Method and device for analyzing dynamic stiffness of pier foundation by adopting actual measurement pier top vertical amplitude |
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