Requirements for a Geo Report Seismic C+
Requirements for a Geo Report Seismic C+
(OP)
Also, posted question in Geotech area, but not sure which area it better applies, geo or structural.
According to 1802.2.6 & 7 of the IBC, it is required to have a Geotech Report for seismic categories C and above. Is there something that is acceptable for a Geotech report not be performed if a more stringent analysis is used? I was informed there was such an entry, but I am unable to find it.
FYI, this is more of an office discussion instead of me trying to design without a Geotech Report.
According to 1802.2.6 & 7 of the IBC, it is required to have a Geotech Report for seismic categories C and above. Is there something that is acceptable for a Geotech report not be performed if a more stringent analysis is used? I was informed there was such an entry, but I am unable to find it.
FYI, this is more of an office discussion instead of me trying to design without a Geotech Report.






RE: Requirements for a Geo Report Seismic C+
RE: Requirements for a Geo Report Seismic C+
-Mike
RE: Requirements for a Geo Report Seismic C+
RE: Requirements for a Geo Report Seismic C+
What do you mean by "a more stringent analysis is used"? Do you mean a more stringent geotechnical analysis, or a more stringent structural analysis?
RE: Requirements for a Geo Report Seismic C+
If you have a seismic design category less than C (for seismic purposes) the IBC does not require a Geotech report per 1802 (my understanding). So if you have a seismic design category in C or above are there values, assumptions, or provisions that the code allows if you still do not have a Geotech report.
It is somewhat ambiguous question, since the design values do not have a great deal to do with the seismic design category.
It a short version is there any way to design a foundation/building without a Geotech report (by code) if the design category is above C.
Again, this is a long story how this question came about in our office, but I want to reiterate that we are not trying to design without a soils report.
RE: Requirements for a Geo Report Seismic C+
What the text of IBC 2000 says is, "Where a structure....Category C in accordance with Section 1616, an investigation shall be conducted, and shall include an evaluation of the following potential hazards resulting from earthquake motions: slope instability, liquefaction, and surface rupture due to faulting or lateral spreading.".
Those are three distinct items that simply need to be "evaluated" by the geotech, and, I presume, reported back to the design team to consider. Its not saying here that a full geotech report is required. That's taken care of in 1802.1.