Self lifting reaction force self balancing loading system

1、 Overall requirements:

The self lifting reaction force self balancing loading system adopts a screw automatic lifting reaction force self balancing loading system, and the loading frame as a whole adopts a self reflecting portal frame. Configure a crossbeam screw type self lifting system, a horizontal active following system, a hydraulic self-locking system, a matching servo oil source, actuators, etc. The control system adopts a multi-channel electro-hydraulic servo control system, matched with a pseudo power experimental system; The vertical actuator can achieve a large vertical load of ≥ 5000kN (later expandable to 10000kN), and the reaction frame can bear a vertical reaction force of ≥ 10000kN, with reserved expansion space and interfaces to ensure that additional actuators can be added in the later stage to achieve vertical loading of ≥ 10000kN; Horizontal actuator (tension and compression) ≥ 1500kN

Conduct quasi-static, dynamic, and quasi-static loading tests, while reserving space and interfaces to ensure that multiple horizontal actuators can be installed and loaded simultaneously in the future. It can be used for axial compression tests, compression shear tests, parallel shear tests, etc. with different loading tonnages, and can meet the loading requirements of various components or structures such as beams, columns, trusses, frames, walls, etc. in structural engineering. The upper crossbeam has a self lifting function and adopts a screw lifting mode. The screw itself can bear vertical loads at full capacity.

2、 Main configuration list

1. One set of self reflection loading frame: adopting a portal self reflection structure, the overall size of the loading frame (above ground part) is ≤ 10000 × 3000 × 7000mm; the loading net space is ≥ 5000 × 2000 × 5000mm. The vertical bearing capacity is ≥ 10000kN, and the horizontal bearing capacity is ≥ 1500kN. Under rated load, the deflection of the beam does not exceed 0.5/1000 of the span, and the lateral deformation of the column does not exceed 0.5/1000 of the height of the loading point. The column adopts a four column structure, with external dimensions ≥ 7000 × 1750 × 500mm, and adopts II

Type structure, with reserved climbing holes. The bottom beam needs to use type II

Type structure, size ≥ 8500 × 2000 × 1000mm. The upper crossbeam should adopt a double beam structure with a hollow middle, and the top connecting beam should adopt a Type II beam structure. Reserve installation holes for horizontal loading actuators at the end of the crossbeam, with a bearing capacity of not less than 1500kN, and reserve installation holes for vertical actuator follow-up oil cylinders to ensure that the follow-up actuators can be installed at any position. The columns and beams are connected by high-strength bolts, and the height of the beams can be fixed at any position. Installation holes are evenly distributed on the top surface of the bottom beam, and linear guide rails are installed throughout the bottom surface of the upper crossbeam. A small car platform that can move freely is installed on the guide rails, and the small car platform can be moved or locked. The above loading framework provides 3D rendering of the loading device, finite element deformation, and stress analysis report.

2. Four sets of screw column pairs: screw diameter ≥ 250mm, capable of withstanding ≥ 10000kN under vertical loads solely relying on the screw

Vertical load. It can be adjusted infinitely throughout the entire stroke, and the horizontal beam lifting is controlled by a servo motor driven spiral lifting mechanism.

3. One set of crossbeam self lifting system: used in conjunction with the screw column pair, it uses a servo motor to drive the spiral lifting mechanism to control the lifting of the crossbeam. And four displacement sensors are configured for synchronous control, with a maximum lifting speed of ≥ 50mm/min and a displacement difference of ≤ 0.1mm at the measuring points. An asynchronous alarm and handling module is required, and the upper limit of asynchronous can be set. After reaching the set value, the lifting motor will automatically stop running; A drawing of the self elevating system is required, indicating the implementation form.

4. One vertical actuator: front flange installation, single pole structure, large compression load ≥ 5000kN, large tensile load ≥ 500kN, working pressure corresponding to full load ≤ 25MPa, oil cylinder pressure resistance ≥

30MPa， Piston stroke ≥ 300mm, starting pressure<0.1MPa, built-in magnetic telescopic displacement sensor with noise reducing accumulator.

5. One tension and pressure sensor: measure the experimental load during structural testing; Wheel spoke structure, dual output; Range ≥ 5000kN, linearity: ≤ 0.05%.

6. 1 set of compression ball joint: using tension spring universal ball joint, with a bearing capacity of ≥ 5000kN.

7. One set of follow-up trolley platform: using linear guide rails as the walking medium, with a bearing capacity of ≥ 5000kN; sliding friction coefficient ≤ 1%, capable of sliding along the entire beam bottom.

8. One horizontal actuator: double output rod structure, large tensile and compressive loads ≥ 1500kN, working pressure corresponding to full load ≤ 25MPa, oil cylinder pressure resistance ≥ 30MPa, stroke ≥ 500mm, starting pressure<0.1MPa, built-in magnetic telescopic displacement sensor. Equipped with imported servo valve, noise reducing accumulator, and spoke type load sensor, both front and rear ends are equipped with loading hinge plates.

9. One set of horizontal actuator mounting plate: used to connect the horizontal oil cylinder, and the installation height can be adjusted freely along the column.

10. Installation accessories for column compression, beam bending, and compression shear specimens: including column compression bottom hinge support, beam bending support pier, hinge support, compression shear anti slip base, compression beam, etc.

11. One set of servo oil source: It is necessary to use a servo oil pump for oil supply, with a system flow rate of ≥ 10L/min. Pressure servo control. One set of oil containing cooling device, used for cooling hydraulic oil in hydraulic systems, including experimental hydraulic oil.

12. One set of multi-channel electro-hydraulic servo control system:

① It can achieve coordinated loading of force and displacement electro-hydraulic servo closed-loop control with ≥ 4 actuators, and the static control accuracy of a single channel system is ≤ 0.5% FS.

② The experimental software can be designed based on user provided data, and can perform compression shear experiments with vertical dual cylinder collaborative loading and vertical loading oil cylinder active follow-up control. The vertical loading adopts a closed-loop control mode for load and displacement, and an active control scheme is adopted to ensure that the pressure beam remains horizontal throughout the experiment, with a height difference of ≤ 0.2mm at both ends of the pressure beam. The vertical oil cylinder horizontal follow-up adopts an active follow-up scheme, with a follow-up error of ≤ 0.2mm.

③ It should have multiple control functions such as force control, displacement control, deformation control, etc., and should be able to achieve any impact free smooth switching of all control modes and control rates during the test process.

④ The main parameters of the control system (load, displacement, etc.) should be able to transmit system signals to external data acquisition systems through analog or digital outputs, achieving the functional requirements of synchronous acquisition between the control system and external data acquisition systems.

⑤ One set of pseudo dynamic experimental system: The software should have a good user interface, and before the experiment, it should be able to interactively input the seismic acceleration time history curve, select the acceleration time history within the required range for the experiment, and establish a hysteresis model for the floor. During the experiment, it is possible to display real-time seismic response time history curves, hysteresis curves, structural vibration animations for each floor, as well as instructions and feedback data interaction with the testing equipment. After the experiment is completed, the hysteresis curve of the floor can be displayed, and the relevant results of the substructure pseudo dynamic test can be output. The test software can communicate with the control software of the electro-hydraulic servo test system, send the loading instructions of the test substructure obtained from the structural time history analysis to the test control system, and obtain the displacement and force response parameters of the test substructure in real time. Relevant judgment criteria can be set to determine the end of a test step, ensuring the smooth progress of the substructure pseudo dynamic test. The pseudo power software needs to provide experimental functions based on the central differential algorithm, which can gradually control, pause loading, and other functions. The experimental software needs to have networked experimental functions. (This parameter requires technical supporting documents such as but not limited to software function screenshots, product color pages, or testing reports.)

13. One set of truss experimental model: It needs to adopt an assembled structure with a trapezoidal structure, which is easy to adjust the node properties and can quickly achieve rigid and hinged conversion. The steel parts can be easily replaced, and at least three types of stiffness members should be equipped. The stiffness ratio should be ≥ 3, and the cross-sectional size of the foundation members should be ≥ 40 * 40mm. Tie rods can be easily installed between nodes, and the measured experimental data of the model has an error compared to the theoretical value<

5%. Provide models and experimental testing plans.

14. One set of framework model: It needs to adopt an assembled structure, which can be assembled into a single multi story framework model, a frame shear structure model, etc. It can conduct internal force distribution experiments, compression shear hysteresis experiments, etc. for a single multi story framework. The stiffness of the model members can be adjusted, and at least three types of stiffness members should be equipped. The stiffness ratio should be ≥ 3, and the cross-sectional size of the foundation members should be ≥ 100 * 100mm. The connection stiffness of the crossbeam and column can be adjusted, and they can be rigidly connected and hinged. The measured experimental data of the model has an error compared to the theoretical value<

5%. Able to withstand vertical loads ≥ 500kN, horizontal loads ≥ 150kN, total height ≥ 2 meters, and at least 2 floors.

15. Equipped with 2 sets of electric hoists: bearing capacity ≥ 10t, chain length ≥ 6m.

16. Reserve installation holes for automatic column clamping function and vertical loading follow-up function.

17. Supporting installation requirements: The ground shall be made of integral cast-in-place reinforced concrete, with a load-bearing capacity of ≥ 5t/m2.

18. Basic construction: All work including equipment foundation survey, design, excavation, pouring construction, etc. must be provided. Excavation foundation area ≥ 10 * 4 * 1.6m, excavation protection and pipeline protection work need to be done well. The excavation foundation needs to be poured as a whole with the bottom beam, and after pouring, the top of the bottom beam should be level with the ground.

3、 Relevant supporting materials

1) Provide 3D rendering of loading equipment, finite element deformation, and stress analysis reports.

2) Complete foundation construction drawings, including reinforcement drawings and design calculations, are required.

3) Multi channel electro-hydraulic servo control systems and pseudo power experimental systems require technical or software copyright certificates and software operation interfaces, stamped with fresh seals, and no deduction of points is provided.

4) Provide case studies of upper crossbeam double beam, upper crossbeam self climbing, and vertical loading double cylinder coordination, with at least one project for each type. Each project can include multiple parts, with a total of ≥ 3 cases, and conduct technical feature analysis.

4、 The bidder shall provide various services including but not limited to transportation, on-site unloading, equipment installation, equipment debugging, technical training, etc. for all equipment bodies and components.

2. Equipment composition

1) Electro hydraulic servo loading system.

2) Data collection system.

3. Electro hydraulic servo loading system

3.1 Host framework

Composition: Composed of 1 set of workbench base, 4 columns, 2 side beams, 1 main span beam, 1 horizontal side beam, horizontal loading beam, etc.

1. Provide a multifunctional comprehensive reaction framework for structural testing;

2. The multifunctional comprehensive reaction frame adopts a self balancing concept design;

3. According to different experiments, the hydraulic lifting and lowering of the reaction frame crossbeam can be freely adjusted;

4. Reserve corresponding installation connections for loading equipment and structural specimens;

5. Can resist horizontal reaction forces generated during biased column tests and complex node loading tests.

6. The reaction frame adopts Q345-B structural steel;

7. The upper crossbeam is equipped with an independent lifting system, which makes the lifting operation of the upper crossbeam convenient and safe.

8. The experimental space is large and the height space can be adjusted,

9. Lateral loading is also required, which requires the overall frame to have sufficient rigidity. The base, column and beam are welded with equal strength box beam, and the column is equipped with slant support to resist the lateral loading force of the test piece;

10. The column is in close contact with the base, which can minimize the impact of column elongation on the test results during the testing process. The overall framework construction and each component are subjected to finite element analysis, and the structural optimization design is repeatedly carried out based on the analysis results to achieve satisfactory results.

11. The crossbeam is adjusted in its vertical position by bolts installed on two vertical columns, which is easy to operate. After adjusting to the test position, it is positioned and locked by bolts to eliminate gaps. In order to ensure the stability and safety of the lifting of the crossbeam, reinforced bolts are used to position the lifting crossbeam.

12. The crossbeam is equipped with an independent lifting mechanism, with lifting cylinders fixed on both sides for continuous adjustment of the test space by controlling the lifting of the cylinders.

3.2 Electro-hydraulic servo actuator

1 vertical actuator: front flange installation, single pole structure, large compression load ≥ 5000kN, large tensile load ≥ 500kN, working pressure corresponding to full load ≤ 25MPa, oil cylinder pressure resistance ≥

30MPa， Piston stroke ≥ 300mm, starting pressure<0.1MPa, built-in magnetic telescopic displacement sensor with noise reducing accumulator.

One horizontal actuator: double output rod structure, large tensile and compressive loads ≥ 1500kN, working pressure corresponding to full load ≤ 25MPa, oil cylinder pressure resistance ≥ 30MPa, stroke ≥ 500mm, starting pressure<0.1MPa, built-in magnetic telescopic displacement sensor. Equipped with imported servo valve, noise reducing accumulator, and spoke type load sensor, both front and rear ends are equipped with loading hinge plates.

The servo linear actuator is the executing component of the loading system, and the system applies test force to the tested object through the actuator. The servo linear actuator consists of the actuator body, servo valve block group, ball joint support, fluid connection components, and other parts. The actuator is equipped with a built-in magnetostrictive displacement sensor for measuring test displacement, and the load sensor is installed at the front end of the actuator piston rod for measuring test load. The load sensor adopts a dynamic high-precision load sensor specially designed for testing machines by Shiquan Company in the United States. The servo valve adopts a specialized electro-hydraulic servo valve for aerospace testing machines.

Each actuator includes:

⑴ Hydraulic cylinder:

Manufacturer: Tianjin Weisi Experimental Instrument Technology Co., Ltd

Structural form: Double bar symmetrical cylinder

Sealing form: Gap sealing (low friction, long life)

Rated working pressure: 21MPa

Working stroke: ± 125mm (with buffer devices at both ends)

High allowable working pressure: 28MPa

⑵ Three stage electro-hydraulic servo valve:

Manufacturer: Tianjin Weisi Experimental Instrument Technology Co., Ltd

Model: SF02 Series (Pilot Valve: Rexroth)

Rated flow: When the valve pressure drops by 7MPa, the flow rate is 630L/min

High work pressure: 31.5MPa

Bandwidth: 200Hz (@ 90 °, 5% signal)

Zero position leakage:<7LPM

Sensitivity:<0.2%

Hysteresis:<0.5%

Three level electro-hydraulic servo valve

⑶ Displacement sensor:

Built in LVDT displacement sensor

Manufacturer: Messotron, Germany

Model: DLH 300AWG 30Q 0.5% 5KHz

Measurement range: 0~300mm