connect2
Structural
- Dec 24, 2003
- 306
coming from another post about floor vibrations in wood floor systems this;
So there are system factors that vary from a simple joist with a nailed plywood sub-floor to a field glued and nailed sub-floor with an attached drywall ceiling all of course sufficiently nailed. As we progress through the floor types the I of the system increases for a number of reasons not the least of which is the 'Stressed skinned Panel' effect of the sub-floor 'becoming one' with it's support, the joist or the floor truss...composite action, a stiffened orthotropic plate
To the best of my knowledge the various floor systems and the degree of composite action assigned to each was based on testing and field applied glueing. Comments.
To have a conforming stressed skin panel only phenol-rescorcinol glues are permitted and they must be used under specific conditions one of which the glue line pressures required are huge and not accomplished with a nail or a screw.
To move forward. In the calculation of a floor system how does one calculate the I of a field glued nailed sub-floor? How does one know what the contribution of the sub-floor is to composite action. To calculate the fundamental frequency of the floor system we need to know I of the system. Do we ignore the possible contribution of the floor sheathing? Seems like everybody feels a nailed glued sub-floor will increase the stiffness and decrease the vibration. But can it be quantified?
So there are system factors that vary from a simple joist with a nailed plywood sub-floor to a field glued and nailed sub-floor with an attached drywall ceiling all of course sufficiently nailed. As we progress through the floor types the I of the system increases for a number of reasons not the least of which is the 'Stressed skinned Panel' effect of the sub-floor 'becoming one' with it's support, the joist or the floor truss...composite action, a stiffened orthotropic plate
To the best of my knowledge the various floor systems and the degree of composite action assigned to each was based on testing and field applied glueing. Comments.
To have a conforming stressed skin panel only phenol-rescorcinol glues are permitted and they must be used under specific conditions one of which the glue line pressures required are huge and not accomplished with a nail or a screw.
To move forward. In the calculation of a floor system how does one calculate the I of a field glued nailed sub-floor? How does one know what the contribution of the sub-floor is to composite action. To calculate the fundamental frequency of the floor system we need to know I of the system. Do we ignore the possible contribution of the floor sheathing? Seems like everybody feels a nailed glued sub-floor will increase the stiffness and decrease the vibration. But can it be quantified?
