Reciprocating fatigue testing machine for bridge structural components

Reciprocating fatigue testing machine for bridge structural componentsSpecially developed for large-size, high load, and complex load-bearing bridge components such as steel box girders, node plates, supports, and large concrete components, it solves the pain points of small load, insufficient space, single axis loading, and poor long-term stability of ordinary fatigue testing machines. It can achieve multi axis synchronous alternating loading of up to 100 tons, accurately simulate the tension and compression during the service life of bridgesbendTwisted composite load condition, meeting the high cycle fatigue testing requirements corresponding to the design life, for highways/Provide full process mechanical performance verification support for the design, production, acceptance, and durability evaluation of railway bridge steel structures.

Equipment Composition

(1)Reciprocating fatigue testing machine for bridge structural componentsHost structure

Adopting an integral welded portal frame, which has undergone annealing to relieve stress and improve rigidity≥1×10 ⁷N/mmEnsure no deformation or vibration under high loads, and adapt to3~10mHorizontal span2~5mHeight space, capable of accommodating30mLarge components such as long steel box girder sections; Equipped with adjustable specimen fixtures, positioning fixtures, and support bases to meet the clamping and fixing of bridge components of different sizes.

（2） Loading System

1.Electro hydraulic servo actuator: multi axis synchronous configuration, realizing composite loading of tension, compression, bending, and torsion, outputting hundred ton level alternating load, fast response, and high accuracy;

2.Hydraulic power unit: High pressure silent pump station, equipped with cooling and filtration system, ensuring stable oil supply for thousands of hours continuously and meeting long-term testing needs;

3.load/Displacement sensor: high-precision real-time acquisition, ensuring precise control of load and stroke.

（3） Measurement and Control System

Full digital servo controller supports multi-channel synchronous control, realizes seamless switching of force, displacement and strain modes, has fast response speed and strong anti-interference ability, and ensures the synchronization and stability of multi axis loading.

（4） Security protection system

Integrated overload protection, over displacement protection, emergency stop button, infrared safety grating, oil temperature/Oil pressure alarm, automatic shutdown in case of abnormal testing, ensuring the safety of equipment, specimens, and personnel.

（5） Auxiliary device

Specialized testing fixtures for prestressed components, strain gauges, temperature sensors, data acquisition modules, etc., expand the testing capabilities of steel strands, anchorages, fixtures, and other specimens.

Software Introduction

（1） Core functions

1.Parameter settings: Custom cycle count, frequency, waveform, load/displacement/Strain target value, supporting multi condition sequence programming;

2.Real time monitoring: dynamically display load, displacement, strain, and temperature curves, synchronously display test status and remaining time;

3.Data collection≥1000HzHigh frequency sampling, no attenuation or loss of data, stable long-term operation accuracy;

4.Analysis and processing: automatic generationS-NCurve, fatigue life report, stress-strain curve, supporting data export（ExcelThePDFTheWord）；

5.Fault diagnosis: Real time monitoring of equipment operation status, alarm prompts, and recording of fault information for quick troubleshooting.

（2） Operational advantages

Visual interface, simple operation, supports manual operation/automatic/Three programmable modes, capable of storing thousands of test plans, meeting the needs of repeated and comparative testing, and suitable for long-term unmanned operation.