Flexible Diaphragm analysis with Nonparallel Irregularity
Flexible Diaphragm analysis with Nonparallel Irregularity
(OP)
I have a trapezoidal building with a wood roof. I am trying to analyze the roof diaphragm but don't really know how to do a flexible diaphragm analysis with the one skewed wall. Three walls form a C-shape and intersect at 90 deg. The fourth wall is at an angle of 125 deg from one wall and 55 from the other. If I consider two orthogonal directions, this will result in out of plane forces developing on the skewed wall. Should one consider the diaphragm as rigid for distribution of lateral forces or is there a better analysis procedure because I know the walls will not be able to handle the out of plane forces? Does any one know of any good refernece material that would help me resolve this issue? Thank you in advance for any assistance.






RE: Flexible Diaphragm analysis with Nonparallel Irregularity
RE: Flexible Diaphragm analysis with Nonparallel Irregularity
RE: Flexible Diaphragm analysis with Nonparallel Irregularity
RE: Flexible Diaphragm analysis with Nonparallel Irregularity
Though, I don't know of a good method (short of FEM modeling) to come up with a good estimation of the strap and chord forces. At least not for something so irregular and non-orthogonal.
RE: Flexible Diaphragm analysis with Nonparallel Irregularity
I see that as a building with walls on four sides. The fact that 3 walls are orthogonal to each other and the other has resultant vectors of 0.823 and 0.567 (by my calculations) shouldn't have a significant bearing on the distribution of forces to the walls.
If you model the building with 4 walls each with a component of reaction and model side wall pressures, the torsional moment produced by the building will be insignificant (IMO).