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June 13, 2013

Comments

Ron Stewart

Occupant Load. Since calculation of Platform Occupant Load 5.5.5.6 requires that the maximum peak loads be calculated according to 5.5.5.6.1 through 5.5.5.6.4, would not 5.5.5.6.4 override 5.5.5.6.1 - 5.5.5.6.3.1 since the is defines the maximum train load to be the maximum capacity for the largest capacity train operating on that track, which would exceed any of the previous criteria, regardless of peak projected ridership.

Chris Hughes

With respect to the calculation of platform loads, the implication of your interpretation means that by treating clause 5.5.5.6.4 as you have, which effectively overrides the previous clauses in this section, would mean that it would be unnecessary to calculate the occupant load for each platform based on the simultaneous evacuation of the entraining load and the train load for that platform in the peak period, as stipulated in 5.5.5.6.1, because your interpretation means that if this figure is lower than the maximum specified in 5.5.5.6.4, then the figure resulting from 5.5.5.6.4 should be used as the more onerous figure, and if the peak period figure as per 5.5.5.6.1 is higher, then the maximum it can be, is the figure imposed by 5.5.5.6.4
We believe this is clearly not the correct interpretation as it would therefore follow that there would be no requirement to include the earlier clauses with respect to train loads.In other words by taking 5.5.5.6.4 in isolation as you have, the figure it produces you are treating as a "minimum" capacity to be considered as opposed to a "maximum" as stated in the clause. We are of the opinion that clause 5.5.5.6.4 provides a limitation for design purposes. In other words when calculating platform loads in accordance with section 5.5.5.6 all of the clauses should be considered as they are written.

Jennifer

When determining Occupant Loads, should one be looking at present day ridership models or projected ridership? If projected, how far into the future should the projection be made? 5yrs? 10yrs? 20 yrs? Many Mobility Studies/ Plans project out to 2040. Is that too far?

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