Governing Structural Code in 1923 in Portland Oregon
Governing Structural Code in 1923 in Portland Oregon
(OP)
Anyone have any idea what the governing structural code would have been in Portland, Oregon, in 1923?
We have an old R/C building with concrete moment frames we have to analyze and want to implement the 10% rule if possible, but we need to determine what lateral and vertical design forces may have been used at that time.
I am old, but not that old...
We have an old R/C building with concrete moment frames we have to analyze and want to implement the 10% rule if possible, but we need to determine what lateral and vertical design forces may have been used at that time.
I am old, but not that old...
Mike McCann, PE, SE (WA)






RE: Governing Structural Code in 1923 in Portland Oregon
However, knowing original design criteria should not be required to implement the 10% exceptions. It is just a % increase in demand or decrease in capacity. For instance, if a shear walls capacity is not reduced by 10% with a new opening when compared to the original construction is OK. Or, if the seismic mass/force contributing the load on the element in question is not increased by more than 10%, it is OK.
RE: Governing Structural Code in 1923 in Portland Oregon
RE: Governing Structural Code in 1923 in Portland Oregon
RE: Governing Structural Code in 1923 in Portland Oregon