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  1. saikee119

    Thailand/Myanmar Earthquake: VIDEO Dramatic collapse of a high rise in Bankok

    Under a normal construction procedure the contractor needs to submit the mill certificates of the reinforcement source. Testing certificates, usually at least the tensile test, will be supplied from time to time as the quality assurance procedure. Thus there should have been records of the...
  2. saikee119

    Thailand/Myanmar Earthquake: VIDEO Dramatic collapse of a high rise in Bankok

    The post by Sym P.le (Mechanical) possibly has the best indication of the initiation of collapse. Sym's graphic shows two main features (1) The first floor was the first to drop down and (2) Columns failed as a consequential damage and then the rest of the building. The...
  3. saikee119

    Bridge Collapse In South Korea on 25 Feb 2025 during construction

    A two-direction bridge has four spans in one direction suddenly collapsed during construction. Each span appears to comprise of 6 precast RC I-beams likely to have been prestressed to be installed in simply supported condition. Apparently most of the beams were in place but a removable steel...
  4. saikee119

    Baltimore Bridge collapse after ship collision

    From the recent NYSB footage it appears the demolished pier's marine works, that is the pile caps and the vertical and raking piles underneath the water (or the cassion structure if used), remains intact. The fender system seems complete and there is no visible movement in the pile caps. Only...
  5. saikee119

    Baltimore Bridge collapse after ship collision

    This photo depicts the deck was sinking in a straight line over the demolished pier. This is important as it could only occur if the pier was pushed away or knocked out underneath the bearings. Thus the pier structure has almost zero resistance against such impact. After the collapse the...
  6. saikee119

    Baltimore Bridge collapse after ship collision

    After the impact one pier remains the other was demolished. The demolished pier does not seem to be able to withstand an impact by a containership. This looks like an under-design. If that is the case the bridge could have been protected by installed extra stronger piers before and after the...
  7. saikee119

    Estimated storage requirement for UK Grid

    From Wikipedia on electricity generation in UK "In 2020, total electricity production stood at 312 TWh (down from a peak of 385 TWh in 2005)". Are we talking about different country here? The Royal Society estimated the 570TWh could happen in 2050. However historically after UK reached its...
  8. saikee119

    Bridge collapses (for the second time) in Bihar, India

    There is some confusion regarding if this bridge collapse was intentional or not because it had suffered the first collapse during Apr 2022. The previous news reported in 2022 that the Sultanganj end collapsed owing to the impact of strong winds and rains in the intervening night of Friday and...
  9. saikee119

    SpaceX foundation slab pulverised

    According to the simple Newton's law I would have expected the vertical thrust action to send off SpaceX could only materialise when there was an equal and opposition reaction provided by the apron concrete slab. This apron concrete slab has been pulverised and the soil underneath was also...
  10. saikee119

    SpaceX foundation slab pulverised

    I would guard against the use of the proprietary "Fondag concrete" as a structural material to withstand 1100C. 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. In ACI 349M-06 for Nuclear...
  11. saikee119

    SpaceX foundation slab pulverised

    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. It appears the RC slab was flush as one level prior to the launch but now has the ground beams...
  12. saikee119

    Bridge collaspe in India

    Chain link fence differences This is the best photo on the old chainlink fence I got from the Internet. It was dated 2008 according to the description. If you download and magnify it you will see the fence is shorter than the pedestrians at the far end. Also the fence had three fixings per...
  13. saikee119

    Bridge collaspe in India

    I don't know the existing design but I would expect the channel to be structural grade. To replace 3 with 4 channels the total second moment of area or the I-value should be comparable otherwise the bending stress will not be the same as before. Scaled from the previous photo the depth of the...
  14. saikee119

    Bridge collaspe in India

    If you read the text carefully I said the weight of beams, due to number increase, would go up. Similarly as well as for the weight of the chain link fence weight would go up if it is higher. These weight increases are parts of the deck's dead weight. Since a professional engineer can be sued...
  15. saikee119

    Bridge collaspe in India

    Possible issues from renovating the Morbi footbridge (1) New deck has 4 instead of 3 longitudinal beams in the old deck From the old bridge before renovation the deflected deck clearly shows 3 longitudinal beams, one at each side plus one at the middle, to give the above symmetrical deflected...
  16. saikee119

    Bridge collaspe in India

    Just some more easy information with photos on this collapse. The information would support the south main cable has severed and is now resting between the west tower and a masonry wall. Here is a screen capture of the Google Map. It appears the west side has a dry beach area but the east...
  17. saikee119

    Bridge collaspe in India

    Actually my point is both of them vibrates! BS5400 has warned the first natural frequency should be kept above 5 Hz as the vibration may be amplified by the walking tempo of the pedestrians. Although back in 1879 there was no BS 5400 for the designer of the Morbi bridge. Nevertheless a slender...
  18. saikee119

    Bridge collaspe in India

    That is a modern phenomenon. The public likes to test anything that moves and vibrates to get high and to be cool. This also happened when the Millennium footbridge was opened in 10 June 2000 in London. That bridge vibrated sideways because it uses cables as the main support. Londoners...
  19. saikee119

    Bridge collaspe in India

    Here are some basic information of Morbi footbridge in Gujarat of India that collapsed on 30 Oct 2022. From various youtube videos Some screen captures were provided below to show what is know so far. Length 230-metre (750 ft) long Width 1.25-metre (4 ft 1 in) wide Built 20 February 1879 at...
  20. saikee119

    Bridge collaspe in India

    Another video shows the moment before the bridge collapse. The footage also show only left main cable left after the right main cable gave away. The fact the right cable wasn't seen after collapse is significant because of the failure could be at one of the two main cable of the bridge. Latest...

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