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Basildon Test Report

When the loading was increased to 6 T the deformation increased dramatically as indicated in Fig. 6 position 2. At this point the load was released and the structure inspected. No recovery of the deformations occurred on removal of the load, the deformed profile being maintained under zero load.

There was no visual evidence of the floor moving on its supporting walls and to confirm the deformations being recorded by the instrumentation, a line was drawn on the underside of the roof to record the relative movements between the planks.

The 6 T load was reapplied and the loaded plank continued to pull out of the floor at this constant load. The test was terminated when the maximum lateral deflection reached was 18.4mm and the final deformed profile under the 6 T load is given in Fig. 6 position 3.

Summary of Findings from Series 2 Tests

End A - (anchors in place)

  1. The deformed profile of the ends of the planks at End A (anchors in place) showed that throughout the loading cycle, movement was fairly evenly transferred from the loaded plank to the adjacent planks. This behaviour was maintained up to a load level of 16 T the limiting capacity being due in the first test to the friction between the roof and its support and in the second test the capacity of the test rig.
  2. At the maximum load of 16 T approximately half of the deformation present was recoverable and deformation under the repeated 16 T load was similar to those recorded during the first load cycle.

End B - (anchors cut)

  1. The deformation at End B corresponding to the maximum deformation recorded at End A occurred under approximately one third of the load applied to End A.
  2. From the beginning of the load cycle the loaded plank moved out from the adjacent planks and the limited movement of the other planks was heavily skewed to one side of the roof.
  3. The movement of the loaded plank due to the 6 T load was non-elastic and continued to 18.4mm when the test was terminated.
  4. The limitation on the capacity to resist and transmit inplane loads was the failure of the loaded plank to act in conjunction with the adjacent planks.

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