Non-destructive axial force test used in the members of spacial truss is highly significant in structural health monitoring.Complex and inconvenient field axial force tests have affected the practicality of the structural health monitoring.To explore the effect factors of frequency method test in the members of spacial truss is directly related to the practicability of the method.The study of effect factors of frequency method can help the method to consider the factors when testing the members of spacial truss.Then

frequency method test can get accurate values of the members of spacial truss.It is very important for bar model test to consider four factors i.e.bar axial force

length

cross section and boundary conditions of the structure in the analysis of frequency method test axial force in the members of spacial truss structure.The analysis of test results based on the beam bending vibration theory and numerical calculation.Model Test shows that bar length

cross section and boundary conditions of the structure have great influence on the frequency of the bars of spacial grid structure.Axial force has a greater influence on the frequency of the members of spacial truss structure

but model test also reveal that the four influencing factors impacting on the bar frequency are a linear change and the degree of influence is different.Therefore

these factors provide a reference standard for frequency method test axial force in the members of spacial truss structure.