Research On Shaking Table Test And New Hybrid Test Method Of Cable Tray Structure

The real-time hybrid test method is developed on the basis of pseudo dynamic test.It uses real-time loading instead of slow-speed loading,which can more accurately reflect the performance of the specimen.This method can only take the key parts of the structure for test,thus,the spend and period are greatly reduced.Because of its economy and accuracy,this method has been widely used in aerospace,civil engineering,transportation and other fields.In order to adopt the finite model as the numerical substructure in the real-time hybrid test,there will be a problem that the computing platform cannot complete the numerical analysis within the specified time,resulting in a large time delay.The real-time hybrid test has the requirement of real-time,the loading command can not be sent to the actuator in real time for loading,and the test can not be carried out smoothly.Due to the complex layout of the conventional cable rack system in the communication room,the traditional research method is to carry out shaking table test on the whole or part of the cable rack system,and its cost and cycle will be very large.Therefore,it is of great significance to study the new hybrid test method of the cable tray structure.Under this background,the shaking table test of a single cable rack is completed firstly;Then,in order to solve the problem of large calculation time delay when using the refined model,the force correction iterative hybrid test method and restart hybrid test method are proposed.The availability of these two new hybrid test methods is proved by numerical simulation and physical test.The main research results and conclusions are listed as follows:(1)The shaking table test of the cable tray system under different working conditions was completed,and the finite element model of the cable tray system was established.Research shows that: the seismic performance of the test cable rack meets the requirements of the code;the displacement of the cable frame increases with the increase of load;the seismic performance of the aluminum alloy cable frame is higher than that of the steel cable frame;the simulation analysis of the restart hybrid test using the finite element model also obtains good results,which verifies the accuracy of the test program and method.(2)Propose the restart hybrid test method of the cable tray system,and complete the test simulation analysis.Research shows that: In the case of large time delay,the test effect of restart hybrid test is better than that of real-time hybrid test simulation,which verifies the effectiveness of restart hybrid test method;The simulation analysis of the restart hybrid test using the finite element model also obtains good results,which verifies the accuracy of the test program and method.(3)The force correction iterative hybrid test method of the cabling frame system is proposed,the test simulation analysis is completed,and the force correction iterative hybrid test is carried out based on the hybrid test system.Research shows that the force correction iterative hybrid test has faster convergence speed and higher accuracy,which can well meet the actual requirements of engineering,which verifies that the method is theoretically feasible and accurate;the higher the accuracy of the force correction model,the higher the accuracy and the faster the convergence rate;The results show that the experimental test has a certain convergence,which verifies the availability of the method to a certain extent.