Table 1607.1 Sidewalk 8,000 lb Point Load
Table 1607.1 Sidewalk 8,000 lb Point Load
(OP)
I have a simple 4' wall in the ROW of a typical 36' street, the curb is 7' from the back of wall. Gonna do a Keystone wall. I used the Rankine method of analysis, not NCMA (conservative).
IBC Table 1607.1, "Sidewalk etc. ..." specifies that a 8,000 lb. point load on 20 sq. inches is required. This loading is required for the City of "la la land"'s retaining wall next to a city street per the Design Manual.
I pointed out that the City sidewalk couldn't handle that kind of point load let alone the soil 1' from the wall. First I showed them that the standard 4" thick City sidewalk couldn't be shown to support an 8k load over 20 inches square. I then pointed out that the necessary soil bearing strength calcs out to be 58 ksf, and that no soil I know can do this.
I am at a loss here. I have succombed to the city and provided for 1000 psf LL. I don't know the reasoning nor the impetus behind this requirement. Do You?
Thank you.
E.J.
IBC Table 1607.1, "Sidewalk etc. ..." specifies that a 8,000 lb. point load on 20 sq. inches is required. This loading is required for the City of "la la land"'s retaining wall next to a city street per the Design Manual.
I pointed out that the City sidewalk couldn't handle that kind of point load let alone the soil 1' from the wall. First I showed them that the standard 4" thick City sidewalk couldn't be shown to support an 8k load over 20 inches square. I then pointed out that the necessary soil bearing strength calcs out to be 58 ksf, and that no soil I know can do this.
I am at a loss here. I have succombed to the city and provided for 1000 psf LL. I don't know the reasoning nor the impetus behind this requirement. Do You?
Thank you.
E.J.






RE: Table 1607.1 Sidewalk 8,000 lb Point Load
RE: Table 1607.1 Sidewalk 8,000 lb Point Load
RE: Table 1607.1 Sidewalk 8,000 lb Point Load
Arguing with a Building Official is like getting into a mud pit wrestling match with a pig. You will get muddy, mad and frustrated unless you realize one thing: the pig LIKES to wrestle.
A Bousinesque (spelling suspect here) analysis will help you deal with the local lateral surcharge pressures due to wheel point loading. It's not hard and I would probably "push" the numbers (unconservatively) for the transient vehicular load.
I would also research whether they also want a guardrail for a 4' drop. Guardrail forces will govern the design of most any retaining wall structure.
RE: Table 1607.1 Sidewalk 8,000 lb Point Load
Don Phillips
http://worthingtonengineering.com