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15 July 2016

 

Pre-stressed string track SkyWay is the optimal solution for thermal distortion compensation

The steel beam:

The steel beam - rail

Thus, extension will make 1.2 m per 1 km.

Tests of a rigidly restrained beam for strength and stability under thermal effect (Δt = 100 °C):

Tests of a rigidly restrained beam for strength and stability under thermal effect

Thus, with the pre-stressing force more than 240 tf, there will be no compression forces in the structure and it will not lose its stability.

Bending moment diagrams in a pre-stressed "rigid thread" and a restrained beam with distributed load and concentrated forces:

Bending moment diagrams in a pre-stressed rigid thread and a restrained beam with distributed load and concentrated forces

Conclusions:

  1. Bending stress in a rigid thread is by an order of magnitude lower than in a beam.
  2. The most dangerous phenomenon when heating a rigidly restrained beam is considered the loss of its stability.

Therefore, a pre-stressed beam with the rated force of T ≥ N100 ° ensures that even temperature difference of Δt = 100° will not cause compression forces in longitudinal fibers of the beam.

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