PSI- Issue 9

I. Shardakov et al. / Procedia Structural Integrity 9 (2018) 207–214 Author name / Structural Integrity Procedia 00 (2018) 000–000

212 6

 

  U t U t    

 

/ 2

U t

2 U t





 

,



1

3

 

 

 

where , , U t U t U t are the vertical displacements relative to the reference base at the corresponding point of the structure. The simulation results are shown by the red line, and the experimental data by the blue line. 1 2 3

Fig. 4. The FEM model of a column-to-beam connection

Figure 1. Vertical displacement   U t (mm) vs. time t (min). (red line – simulation, blue line – experiment) The value   U t is a macro parameter that integrally reflects all the deformation processes occurring in the vicinity of the bolted connection, including inelasticity and contact interaction. Therefore,   U t can be used as an informative parameter in the deformation monitoring of the flange connection. It follows from the obtained results that the application of the force   150kN F t  to the jacks and its subsequent removal are not accompanied by the return-to zero of the value   U t due to the elastic behavior of the material, i.e. inelastic deformation begins. Fig. 6 shows the time variations of the local deformations (in the horizontal direction) of the vertical column in the vicinity of the bolted connection. These deformations correspond to points E1 and E2 (Fig. 2) with mounted strain gauges.