Abstract
In this paper, we take the railway subgrade 
 dynamic response test system as the study object, the 
 laboratory test reaction frameâ??s model factors were 
 analyzed through the finite element analysis software 
 MSC.Patran/Nastran. The former six-order original 
 frequencies and vibration modes of the frame were 
 caculated and evaluated in detail. Then we studied its 
 transient response under two working conditions: when itâ??s 
 fully loaded and suddenly unloaded, and the deformation 
 displacement curves of the key points of the frame were 
 obtained. These results provide a basis for the detailed study 
 to the mechanical behavior of the frame and setting the 
 proper working frequencies of the hydraulic servo 
 excitation cylinder to avoid the resonance.
Highlights
The light steel structures are mainly made of welded steel sheets or cold-formed steel members, which the typical light rigid structure is the portal frame [1]
In order to avoid resonance, prevent the servo hydraulic cylinder and the frame from being destructed, it is need to take the dynamic analysis to the frame to find out its natural frequencies and study the dynamic response under the typical work conditions, which may be help to set a reasonable frequency range of the servo hydraulic excitation cylinder and provide a basis for the later dynamic design
In the future design it is necessary to increase the local stiffness and damping appropriately to suppress the vibration; 5) The distribution of the overall integral stiffness and mass is comparatively balanced, there is no noticeably weakness and excess, it will help to improve the dynamic characteristics of the frame
Summary
The light steel structures are mainly made of welded steel sheets or cold-formed steel members, which the typical light rigid structure is the portal frame [1]. As the steel portal frame are widely used, there are more and more new demands to the frames, such as higher antiseismic, greater stability, and longer fatigue resistance, etc [2]. A laboratory test device of the high speed railway subgrade dynamic response test system was set up in a university laboratory [3,4,5], and the core of which is the servo hydraulic excitation cylinder, its maximum excitation force is 300kN and the maximum excitation frequency is 40Hz. In order to avoid resonance, prevent the servo hydraulic cylinder and the frame from being destructed, it is need to take the dynamic analysis to the frame to find out its natural frequencies and study the dynamic response under the typical work conditions, which may be help to set a reasonable frequency range of the servo hydraulic excitation cylinder and provide a basis for the later dynamic design
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