That's a real risk, and it appears that there may have been some engine damage from debris generated on the pad. There is a second argument that debris getting thrown back up into the base of the rocket could have damaged it to the extent where the remaining engines caused it to accelerate in an unintended direction.
The ablation would continue for some time after the rocket had lifted off the structure, so a lot of the observed damage should have been after the point where failure would take the rocket off vertical. There should be a relatively small window where there's a high rate of ablation and the weight is still on the structure.
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Once the engines approach full thrust, the structure is no longer supporting the rocket and failure of the structure can no longer cause the rocket to cant away from vertical. So, the critical moments are where the structure is still supporting the rocket and significant thrust is being generated. Yes, damage would start to occur as soon as thrust was applied, but it's an ablative process which took time to produce the end result we saw in pictures of the damaged structure. The missing concrete did not just instantly vaporise when the thrust was first applied, therefore the ability of the structure to support the rocket did not instantly diminish to a critical level. RE: SpaceX foundation slab pulverised dold (Structural) 24 Apr 23 I could be wrong. Fondag concrete may be applied as a shield over and above the structural concrete but can it bond to it under severe pressure and heat without being blown off is a key design consideration too. Thus in a nuclear melt down if the concrete were to remain as a structural element the temperature permitted is less than 343C. Evidence shall also be provided that verifies that the increased temperatures do not cause deterioration of the concrete with or in the absence of applied loads. (c) Higher temperatures than given in Items (a) and (b) may be allowed in the concrete if tests are provided to evaluate the reduction in strength and this reduction is applied to the design strength. However, local areas are allowed to reach 343 ☌ from fluid jets in the event of a pipe failure (b) During an accident or for any other short-term interruption, the temperatures shall not exceed 177 ☌ for the interior surface. (a) For normal operation or any other long-term period, the temperatures shall not exceed 66 ☌, except for local areas that are allowed to have increased temperatures not to exceed 93 ☌
In ACI 349M-06 for Nuclear safety-related structures it was statedĦ.3.15 All piping containing liquid, gas, or vapor pressure in excess of 1.4 MPa above atmospheric pressure or temperature in excess of 66 ☌ shall be sleeved, insulated, or otherwise separated from the concrete and/or cooled to limit concrete stresses to allowable design strength and to limit concrete temperatures to the following: It appears its property to withstand 1100C may as a refractory shield and not necessary as a structural element to resist compressive load and abrasion. I would guard against the use of the proprietary "Fondag concrete" as a structural material to withstand 1100C. RE: SpaceX foundation slab pulverised FacEngrPE (Mechanical) 22 Apr 23 01:17 Consequently a huge disaster could occur if the rocket hit the population with the amount of fuel it carried. (3) Had any of the RC column or ground beam failed during the last launch the supporting structure might not have remained static then the rocket could have shot off at an angle other than vertically upward.
This would suggest the reinforced concrete in adequate dimension could be the suitable material for the structure including the slab if adequately shield from the high temperature heat. (2) The reinforced concrete columns and ground beams show little damage. I do not know if it was reinforced or not but it would have been criminal if it wasn't. (1) The "disappeared" reinforced concrete slab was totally unsuitable for its purpose. There seem to be at least the following issues in play:. The video also claimed there were concrete fragments flying all over the place as shrapnel damaging some fuel and water tanks. It appears the RC slab was flush as one level prior to the launch but now has the ground beams exposed. The above photo was from a youtube video showing the reinforced concrete supporting structure of the SpaceX rocket before and after the yesterday's launch when it exploded 4 minutes into the flight.
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