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  • Users: Peter Dow
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  1. Peter Dow

    Miami Pedestrian Bridge, Part V

    I like the computer modelling approach. With the help of the same online truss calculator, I modelled the truss of the pedestrian bridge and calculated how 50% of the weight of the bridge (about 950 kips) would be added to the bottom end joint of the truss and onto the north pier by the end...
  2. Peter Dow

    Miami Pedestrian Bridge, Part IV

    2000 kips is a factored load which is a resistance factor of 0.65 less than the nominal load capacity which is 2,000/0.65 = 3,076 kips. https://res.cloudinary.com/engineering-com/image/upload/v1521982873/tips/criteria_concrete_column_design_vzseib.jpg I would expect a break at any load greater...
  3. Peter Dow

    Miami Pedestrian Bridge, Part IV

    Not exactly. It was 1615 kips plus whatever additional load from the post-tensioning bars that were in use, which is unknown but the 2 bars together are easily capable of adding another 600 kips. So say somewhere between 1615 kips and 2215 kips. and you will likely be right. I estimate that...
  4. Peter Dow

    Miami Pedestrian Bridge, Part IV

    Yes indeed and at the risk of repeating myself here is that calculation again. Nevertheless, the design equations which engineers use employ φ factors for a very good reason. Mmm. Be careful. Americans use the "short ton" which is equal to 2 kips. The UK "long ton" is heavier, equal to...
  5. Peter Dow

    Miami Pedestrian Bridge, Part IV

    Thanks. Here it is. https://res.cloudinary.com/engineering-com/image/upload/v1522022249/tips/AASHTO_5.7.4.4-3_iauagn.jpg Calculating the factored axial resistance or factored load should treat the contribution of prestressing steel differently from post-tensioned bars. It is not appropriate...
  6. Peter Dow

    Miami Pedestrian Bridge, Part IV

    Thanks! I modified my reply to your post too. I didn't see that value explicitly stated in the engineers' drawings, admittedly. However from the following photographs, I've got something of an idea by estimating that the rebar used is #7, diameter 0.875", area 0.6 square inches. This image...
  7. Peter Dow

    Miami Pedestrian Bridge, Part IV

    Thanks! Agreed. https://res.cloudinary.com/engineering-com/image/upload/v1522004854/tips/force_vector_ystcaz.jpg Agreed.
  8. Peter Dow

    Miami Pedestrian Bridge, Part IV

    Newbie here. Close enough. 2,200 kips is not "okay" for member #11. Far from it. When calculating the maximum allowable design factored load for a concrete column there are other multiplication constants which reduce the design load considerably, as these university lecture notes explain...

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