CN112878387B - Test system and method for simulating influence of top dynamic load on pile structure performance - Google Patents
Test system and method for simulating influence of top dynamic load on pile structure performance Download PDFInfo
- Publication number
- CN112878387B CN112878387B CN202110006690.1A CN202110006690A CN112878387B CN 112878387 B CN112878387 B CN 112878387B CN 202110006690 A CN202110006690 A CN 202110006690A CN 112878387 B CN112878387 B CN 112878387B
- Authority
- CN
- China
- Prior art keywords
- pile
- tested
- dynamic load
- actuator
- cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention discloses a test system and a test method for simulating the influence of top dynamic load on pile structural performance, and belongs to the field of constructional engineering. The test system comprises an anchoring and cable force adjusting device, a cable, an actuator, a fastening connection device, a vertical anchoring device and a data acquisition and recording device. According to the invention, the vertical pressure of the structure is applied to the pile integrated structure through the static symmetrical pretension of the stay rope, then the horizontal and vertical dynamic loads applied to the top end of the structure are simulated through the dynamic acting force applied by the actuator through the stay rope, and the data acquisition and recording device is used for measuring, storing and processing analysis test data. The invention has reasonable structure and simple operation, can be used for researching the influence rule of the top dynamic load on the bearing capacity and the deformation performance of the pile integrated structure in situ, and provides an effective means for the in-situ detection and the test of the bearing capacity of the pile integrated structure under the action of the dynamic load.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a test system and a test method for simulating the influence of top dynamic load on pile structure performance, which can be used for in-situ measurement of pile integrated structure bearing capacity and deformation change under vertical or vertical and horizontal dynamic load disturbance, and can be applied to research on the influence rule of horizontal and vertical dynamic load action on structure bearing capacity and deformation.
Background
The pile column integrated structure is a common vertical bearing capacity component connected by a single column and a pile foundation, and is widely applied to large bridges and urban overhead due to high bearing capacity, good economy, simple design and convenient construction. In actual engineering, after the pile integrated structure is poured, bearing capacity detection needs to be carried out in situ, but the existing detection device and the corresponding detection method can only carry out vertical bearing capacity static load detection, so that the influence of dynamic load disturbance action such as vehicle braking and impact on the top end of the structure in a real environment on the bearing capacity and deformation is ignored, the authenticity is lacking, and a certain potential safety hazard is easily caused.
Disclosure of Invention
The invention aims to make up the defects of the prior art and provides a test system and a test method for simulating the influence of a top dynamic load on the structural performance of a pile.
The invention is realized by the following technical scheme:
a test system for simulating the influence of top dynamic load on the structural performance of a pile comprises an anchoring and cable force adjusting device, a guy cable, an actuator, a fastening connection device, a vertical anchoring device and a data acquisition and recording device;
the data acquisition and recording device comprises a strain gauge, a displacement meter, a data transmission line and a data receiving terminal;
the inhaul cables are obliquely and symmetrically arranged on two sides of the pile to be tested, the upper ends of the inhaul cables are connected with the upper part of the pile to be tested through the fastening connection device, and the lower ends of the inhaul cables are respectively connected with the anchoring devices and the cable force adjusting devices which are positioned on two sides of the pile to be tested; the stay rope is provided with an actuator, the output direction of the actuator is parallel to the vertical center axis of the pile to be tested, the actuator is connected with a data receiving terminal through a data transmission line, so that loading data of the actuator are transmitted, recorded and processed and analyzed, and the displacement meter is arranged at the top end of the pile to be tested; the strain gauge is attached to the pile to be measured and the inhaul cable and used for measuring the strain of the attached area, and the strain gauge is connected with the data receiving terminal through the data transmission line.
The anchoring and cable force adjusting device and the vertical anchoring device adopt structures which are fixedly connected with the ground and are arranged on the original foundation and the temporary structure.
The displacement meters are two and are respectively used for measuring the horizontal displacement change and the vertical displacement change of the pile to be measured.
The strain gauge is attached to the middle and bottom areas of the pile to be tested, and the upper and lower third areas of the inhaul cable.
A test method for simulating the influence of top dynamic load on pile structure performance specifically comprises the following steps:
s1, respectively installing a fastening connection device and a horizontal displacement meter and a vertical displacement meter at the top end of a pile to be detected; a plurality of strain gauges are arranged in the middle and bottom areas of the part above the ground of the pile to be tested and in the third areas of the upper part and the lower part of the inhaul cable;
s2, installing a inhaul cable, wherein one end of the inhaul cable is connected with a fastening connection device, the other end of the inhaul cable is connected with an anchoring and cable force adjusting device, and meanwhile, the inhaul cable is symmetrically pre-tensioned and fixed through the anchoring and cable force adjusting device after tensioning is completed;
s3, connecting two ends of an actuator with the inhaul cable and the vertical anchoring device respectively, wherein the actuator is connected with a data receiving terminal through a data transmission line;
s4, applying dynamic load to the pile to be tested through the actuator, recording loading data of the actuator through a data transmission line by the data receiving terminal, measuring horizontal and vertical displacement changes of the pile to be tested through the horizontal and vertical displacement meters, measuring strain of an attachment area of the pile to be tested through the strain gauge, and finally obtaining test analysis results.
Analyzing the rule of influence of the vertical dynamic load action on the bearing capacity and deformation of the pile to be tested by utilizing the symmetrical acting force exerted by the actuator; and the actuator is utilized to apply asymmetric acting force to the inhaul cable to analyze the rule of influence of the vertical and horizontal dynamic load action on the bearing capacity and deformation of the pile to be tested.
The test analysis result comprises a pretension force and pile vertical displacement curve to be tested and a pile stress and strain curve to be tested after pretension is completed; and after the dynamic load loading is completed, a dynamic load and pile column vertical displacement and horizontal displacement curve to be measured is adopted, and a pile column stress strain curve to be measured is obtained.
The invention has the advantages that: the invention can not only independently measure static vertical bearing capacity and deformation of the pile integrated structure, but also consider the influence of horizontal and vertical dynamic disturbance on the structural bearing capacity and deformation, compared with the traditional method, the invention solves the defect that the traditional detection system and the corresponding method can only independently detect vertical static load, is closer to engineering reality, improves the safety of the actual structure in the use process, and the test system fully utilizes the original structural members, does not additionally increase test devices, has good economy, and the test method is simple and efficient and has better operability.
Drawings
FIG. 1 is a diagram of a test system of the present invention;
FIG. 2 is a top view of an unarmed displacement meter of the test system of the present invention;
fig. 3 is a simplified stress diagram of the pile (4) to be tested after the pre-tensioning of the inhaul cable is completed, wherein the inhaul cable pulling force F1 is decomposed into F2 and F3.
Fig. 4 is a diagram illustrating symmetrical dynamic loading forces of a pile (4) to be tested, wherein the pulling force of a guy cable comprises a pretension force F1 and a dynamic load F4, F1 is decomposed into F2 and F3 respectively, and F4 is decomposed into F5 and F6.
Fig. 5 is a diagram of asymmetric dynamic loading stress of a pile (4) to be tested, wherein the pulling force of a guy cable in the diagram comprises a pretension force F1 and asymmetric dynamic loads F4 and F7, F1 is decomposed into F2 and F3 respectively, F4 is decomposed into F5 and F6, and F7 is decomposed into F8 and F9.
Reference numerals illustrate:
the device comprises a 1-anchoring device, a cable force adjusting device 2-a guy cable 3-an actuator 4-a pile 5 to be tested, a fastening connecting device 6-a vertical anchoring device 7-a ground 8-a displacement meter 9-a strain gauge 10-a data transmission line 11-a data receiving terminal.
Detailed Description
The technical solution of the present invention will be described in more detail below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The test system shown in fig. 1 and 2 in the embodiment of the invention is an in-situ detection system for simulating the influence of the top dynamic load on the performance of a pile integrated structure, and mainly comprises an anchoring and cable force adjusting device 1, a guy cable 2, an actuator 3, a fastening connection device 5, a vertical anchoring device 6 and a data acquisition and recording device; the data acquisition and recording device comprises a strain gauge 9, a displacement meter 8, a data transmission line 10 and a data receiving terminal 11.
The inhaul cables 2 are symmetrically arranged on two sides of the pile 4 to be tested, one end of each inhaul cable is connected with the pile 4 to be tested through a fastening connection device 5, and the other end of each inhaul cable is connected with the anchoring and cable force adjusting device 1; the inhaul cable 2 is provided with an actuator 3, and the actuator 3 is connected with a data receiving terminal 11 through a data transmission line 10 so as to transmit and record loading data of the actuator; the displacement meter 8 is arranged at the top end of the pile 4 to be measured and is used for measuring the horizontal displacement change and the vertical displacement change of the pile 4 to be measured respectively; the strain gauge 9 is attached to the pile 4 to be tested and the inhaul cable 2 and is used for measuring the strain of an attachment area.
The anchoring and cable force adjusting device 1 and the vertical anchoring device 6 of the pile 4 to be tested adopt original foundation and temporarily arranged structures fixedly connected with the ground 7; the force output direction of the actuator 3 is parallel to the vertical center axis of the pile 4 to be tested;
on the basis of the test system, the embodiment of the invention also provides an in-situ test method for simulating the influence of the top dynamic load on the performance of the pile integrated structure, which comprises the following steps:
s1, respectively installing a fastening connection device 5 and a horizontal and vertical displacement meter 8 at the top end of a pile 4 to be detected; a plurality of strain gauges 9 are arranged in the middle and bottom areas of the part above the ground 7 of the pile 4 to be tested and in the third areas of the upper part and the lower part of the inhaul cable 2;
s2, installing a guy cable 2, wherein one end of the guy cable 2 is connected with a fastening connection device 5, the other end of the guy cable 2 is symmetrically pre-tensioned through an anchoring and cable force adjusting device 1, and the guy cable 2 is fixed through the anchoring and cable force adjusting device 1 after tensioning is completed;
s3, connecting two ends of an actuator 3 with the inhaul cable 2 and the vertical anchoring device 6 respectively through the inhaul cable, wherein a data transmission line 10 is arranged on the actuator 3 and is connected with a data receiving terminal 11;
s4, in the test process, the actuator 3 applies dynamic load to the pile 4 to be tested through the inhaul cable 2, and the data acquisition and recording device measures and stores test data, wherein the data receiving terminal 11 records the loading data of the actuator 3, the displacement change of the pile 4 to be tested measured, which is measured by the horizontal and vertical displacement meters 8, and the strain of the attachment area, which is measured by the strain gauge 9, through the data transmission line 10;
specifically, in step 2, pretension force F1 is symmetrically applied by the cable 2 as shown in fig. 3, wherein pretension force F1 is decomposed into F2 and F3; in step S4, as shown in fig. 4, a dynamic acting force F4 is symmetrically applied to the cable 2 by an actuator 3 to measure the influence rule of vertical dynamic disturbance on the bearing capacity and deformation of the pile 4 to be tested, wherein the pretension force F1 of the cable 2 is decomposed into F2 and F3, and the F4 is decomposed into F5 and F6; as shown in fig. 5, asymmetric dynamic acting forces F4 and F7 are applied to the cable 2 by the actuator 3, the pretensioning force F1 of the cable 2 is decomposed into F2 and F3, and the pulling forces F4 and F7 of the cable 2 are respectively decomposed into F5 and F6 and F8 and F9, so as to measure the vertical and horizontal bearing forces and deformation of the pile 4 to be tested under the combined action of the vertical and horizontal dynamic disturbance.
Specifically, the analysis result comprises a pretension force and pile 4 vertical displacement curve to be tested and a pile 4 stress and strain curve to be tested after pretension is completed; after the dynamic load loading is completed, a curve of the vertical displacement and the horizontal displacement of the dynamic load and the pile 4 to be tested is obtained, and a curve of the stress strain of the pile 4 to be tested is obtained.
Claims (5)
1. A test method for simulating the influence of top dynamic load on pile structure performance is characterized by comprising the following steps: the test system for simulating the influence of the top dynamic load on the structural performance of the pile comprises an anchoring and cable force adjusting device, a guy cable, an actuator, a fastening connection device, a vertical anchoring device and a data acquisition and recording device;
the data acquisition and recording device comprises a strain gauge, a displacement meter, a data transmission line and a data receiving terminal;
the inhaul cables are obliquely and symmetrically arranged on two sides of the pile to be tested, the upper ends of the inhaul cables are connected with the upper part of the pile to be tested through the fastening connection device, and the lower ends of the inhaul cables are respectively connected with the anchoring devices and the cable force adjusting devices which are positioned on two sides of the pile to be tested; the stay rope is provided with an actuator, the output direction of the actuator is parallel to the vertical center axis of the pile to be tested, the actuator is connected with a data receiving terminal through a data transmission line, and the displacement meter is arranged at the top end of the pile to be tested; the strain gauge is attached to the pile to be tested and the inhaul cable, and is connected with the data receiving terminal through the data transmission line;
the test method for simulating the influence of the top dynamic load on the pile structure performance is provided on the basis of the system, and specifically comprises the following steps:
s1, respectively installing a fastening connection device and a horizontal displacement meter and a vertical displacement meter at the top end of a pile to be detected; a plurality of strain gauges are arranged in the middle and bottom areas of the part above the ground of the pile to be tested and in the third areas of the upper part and the lower part of the inhaul cable;
s2, installing a inhaul cable, wherein one end of the inhaul cable is connected with a fastening connection device, the other end of the inhaul cable is connected with an anchoring and cable force adjusting device, and meanwhile, the inhaul cable is symmetrically pre-tensioned and fixed through the anchoring and cable force adjusting device after tensioning is completed;
s3, connecting two ends of an actuator with the inhaul cable and the vertical anchoring device respectively, wherein the actuator is connected with a data receiving terminal through a data transmission line;
s4, applying dynamic load to the pile to be tested through the actuator, recording loading data of the actuator through a data transmission line by the data receiving terminal, measuring horizontal and vertical displacement changes of the pile to be tested through the horizontal and vertical displacement meters, measuring strain of an attachment area of the pile to be tested through the strain gauge, and finally obtaining test analysis results;
analyzing the rule of influence of the vertical dynamic load action on the bearing capacity and deformation of the pile to be tested by utilizing the symmetrical acting force exerted by the actuator; and the actuator is utilized to apply asymmetric acting force to the inhaul cable to analyze the rule of influence of the vertical and horizontal dynamic load action on the bearing capacity and deformation of the pile to be tested.
2. The method for simulating the effect of top dynamic load on pile structural performance according to claim 1, wherein the method comprises the following steps: the anchoring and cable force adjusting device and the vertical anchoring device adopt structures which are fixedly connected with the ground and are arranged on the original foundation and the temporary structure.
3. The method for simulating the effect of top dynamic load on pile structural performance according to claim 1, wherein the method comprises the following steps: the displacement meters are two and are respectively used for measuring the horizontal displacement change and the vertical displacement change of the pile to be measured.
4. The method for simulating the effect of top dynamic load on pile structural performance according to claim 1, wherein the method comprises the following steps: the strain gauge is respectively attached to the middle and bottom areas of the pile to be tested, and the upper and lower third areas of the inhaul cable.
5. The method for simulating the effect of top dynamic load on pile structural performance according to claim 1, wherein the method comprises the following steps: the test analysis result comprises a pretension force and pile vertical displacement curve to be tested and a pile stress and strain curve to be tested after pretension is completed; and after the dynamic load loading is completed, a dynamic load and pile column vertical displacement and horizontal displacement curve to be measured is adopted, and a pile column stress strain curve to be measured is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110006690.1A CN112878387B (en) | 2021-01-05 | 2021-01-05 | Test system and method for simulating influence of top dynamic load on pile structure performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110006690.1A CN112878387B (en) | 2021-01-05 | 2021-01-05 | Test system and method for simulating influence of top dynamic load on pile structure performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112878387A CN112878387A (en) | 2021-06-01 |
| CN112878387B true CN112878387B (en) | 2023-08-08 |
Family
ID=76046838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110006690.1A Active CN112878387B (en) | 2021-01-05 | 2021-01-05 | Test system and method for simulating influence of top dynamic load on pile structure performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112878387B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990073388A (en) * | 1999-07-08 | 1999-10-05 | 이성희 | an process of loading teste for loading structure use of transferable loading-apparatus |
| CN103031861A (en) * | 2012-12-31 | 2013-04-10 | 同济大学 | Test device for simulating six-direction load action on raft of raft base |
| CN105019481A (en) * | 2015-06-30 | 2015-11-04 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | Method for testing bearing capacity of foundation pile with dynamic stage loading method |
| CN106939621A (en) * | 2017-03-08 | 2017-07-11 | 浙江大学 | Detachable water tank loading test pile apparatus and pile testing method |
| CN106988352A (en) * | 2017-04-28 | 2017-07-28 | 浙江科技学院 | A kind of method of testing for considering soil body preconsolidation and the horizontal bearing capacity of single pile under cyclic load |
| CN107178102A (en) * | 2017-06-28 | 2017-09-19 | 石家庄铁道大学 | Pass through Caves foundation pile ultimate bearing capacity model assay systems and test method |
| CN110629812A (en) * | 2019-10-25 | 2019-12-31 | 中铁第四勘察设计院集团有限公司 | Loading test device and method for vertical dynamic and static loads of single pile |
| CN111648415A (en) * | 2020-05-29 | 2020-09-11 | 河海大学 | Device and method for testing ultra-long-term vibration characteristics of rock-socketed single pile |
-
2021
- 2021-01-05 CN CN202110006690.1A patent/CN112878387B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990073388A (en) * | 1999-07-08 | 1999-10-05 | 이성희 | an process of loading teste for loading structure use of transferable loading-apparatus |
| CN103031861A (en) * | 2012-12-31 | 2013-04-10 | 同济大学 | Test device for simulating six-direction load action on raft of raft base |
| CN105019481A (en) * | 2015-06-30 | 2015-11-04 | 安徽省（水利部淮河水利委员会）水利科学研究院（安徽省水利工程质量检测中心站） | Method for testing bearing capacity of foundation pile with dynamic stage loading method |
| CN106939621A (en) * | 2017-03-08 | 2017-07-11 | 浙江大学 | Detachable water tank loading test pile apparatus and pile testing method |
| CN106988352A (en) * | 2017-04-28 | 2017-07-28 | 浙江科技学院 | A kind of method of testing for considering soil body preconsolidation and the horizontal bearing capacity of single pile under cyclic load |
| CN107178102A (en) * | 2017-06-28 | 2017-09-19 | 石家庄铁道大学 | Pass through Caves foundation pile ultimate bearing capacity model assay systems and test method |
| CN110629812A (en) * | 2019-10-25 | 2019-12-31 | 中铁第四勘察设计院集团有限公司 | Loading test device and method for vertical dynamic and static loads of single pile |
| CN111648415A (en) * | 2020-05-29 | 2020-09-11 | 河海大学 | Device and method for testing ultra-long-term vibration characteristics of rock-socketed single pile |
Non-Patent Citations (1)
| Title |
|---|
| 独斜塔斜拉桥预应力索塔锚固区模型试验研究;叶华文;李翠娟;徐勋;肖林;强士中;;西南交通大学学报;第49卷(第01期);第52-58页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112878387A (en) | 2021-06-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110864968B (en) | Stress gradient loading test device and method for accurately determining loading energy | |
| CN104897479B (en) | A kind of composite support insulator mechanical property comprehensive detection system | |
| CN103076192A (en) | Portable performance test device for automatic control of combined action of bidirectional load of beam-column joint and determination method | |
| KR101166139B1 (en) | Apparatus and method for horizontal load test of strip foundation | |
| KR101008666B1 (en) | Device For Moment Test | |
| CN102032959B (en) | Vertical intelligent force measurement support | |
| CN104975621A (en) | Multi-anchoring end retaining wall indoor model testing apparatus and testing method | |
| CN112857988A (en) | Asymmetric load loading test system and test method for full-scale test of pipe piece | |
| CN109115632A (en) | The comprehensive shearing experiment device of anchoring body and its experimental method | |
| CN109211390B (en) | Safety test and evaluation method for vibration and strength of power transmission tower | |
| CN115753338A (en) | Composite bearing capacity test device and method based on power transmission tower anchor cable bearing platform | |
| CN114059602A (en) | Anchor cable prestress nondestructive detection system and detection method | |
| CN101701882B (en) | Fast identification method of tower structure stiffness | |
| CN106705902B (en) | A kind of system and method for monitoring filling band stability | |
| CN112878387B (en) | Test system and method for simulating influence of top dynamic load on pile structure performance | |
| CN109946155A (en) | A kind of steel bridge weld stress real-time monitoring device and application method | |
| CN109100232B (en) | Testing device for detecting vertical bearing capacity of climbing cone of bridge tower and using method | |
| CN101487271B (en) | Dynamic detection method and device for civil engineering structure foundation restriction ability | |
| CN103528719B (en) | A kind of packaged type bridges globality method for quick | |
| CN105045944B (en) | A kind of engineering prestressing technique use state appraisal procedure | |
| CN207717334U (en) | A kind of laboratory cable tension vibration detecting device based on jack | |
| CN201362861Y (en) | Dynamic detection device for foundation restricting capability of civil engineering structure | |
| Kim et al. | Monitoring results of a self-anchored suspension bridge | |
| CN216816275U (en) | System for testing stress performance of combined bridge deck under action of eccentric load | |
| CN217359368U (en) | Bidirectional self-balancing opposite-vertex loading device for creep test of concrete simply supported beam |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |