Figure 1
Setup for testing straight and arching sliding joints (a) and picture of the test facility with an SV prop constructed from V32 sections (b).
Figure 2
Inspecting the emissivity e of the steel used to construct the V32 sections: (a) picture of the dryer with the sections; (b) thermal image.
Figure 3
Courses of sliding joint static load capacity Fs: (a) SV32 – two SDO32W shackles, Md = 450 N m; (b) SV32t – three SDO32W shackles, Md = 500 N m.
Table 1
Result compilation of SV32t straight sliding joint tests under dynamic loading.
| Test no. | vp, m/s | z, m | Ec, J | Nd, kN | Tmax, °C |
|---|---|---|---|---|---|
| 1 | 2.05 | 140 | 25,556 | 183 | 169.6 |
| 2 | 110 | 23,387 | 213 | ||
| 3 | 95 | 33,256 | 235 | ||
| 4 | 2.45 | 155 | 33,256 | 215 | 175.5 |
| 5 | 160 | 33,617 | 210 | ||
| 6 | 150 | 45,293 | 219 | ||
| 7 | 2.79 | 230 | 45,293 | 197 | 234.1 |
| 8 | 205 | 43,485 | 212 | ||
| 9 | 205 | 43,485 | 212 | ||
| Average | 211 | ||||
| Standard deviation | 14 |
Figure 4
Pictures of sliding joints in an SV32t prop (three shackles in the joint).
Figure 5
Course of joint force and maximum temperature at an impact velocity vp = 2.05 m/s (a) and joint thermal image (b).
Figure 6
Course of joint force and maximum temperature at an impact velocity vp = 2.45 m/s (a) and joint thermal image (b).
Figure 7
Course of joint force and maximum temperature at an impact velocity vp = 2.79 m/s (a) and joint thermal image (b).
Figure 8
Arching sliding joint (a, c), course of joint force and maximum temperature at an impact velocity vp = 0.55 m/s (b), and joint thermal image (d).
Figure 9
Course of joint force and maximum temperature at an impact velocity vp = 2.05 m/s (a), picture of an arching joint (b), and joint thermal image (c).
Figure 10
SV32tw friction prop with four shackles: three shackles in the joint and one restraining shackle under the joint.
Figure 11
Course of joint force and maximum temperature at an impact velocity vp = 2.05 m/s (a) and joint thermal image (b). 3 – lower shackle; 4 – restraining shackle.