I would like to get your opinions on the following stud rail layout. The column is oriented 45 degrees to the normal layout of the typical columns - see attachment. As I read the code, the rails are supposed to perpendicular to the face of the column. The structure is a post-tensioned slab. If I...
I generally use CRSI's design handbook for designing pile caps. However, they have taken the pile cap design out of the latest handbook and made it a separate publication. Which is fine. However, that publication is no longer available on their web site. Does anyone have a good reference to use...
We are having a discussion in our office as to whether wind loads are considered static or dynamic. We have a geotechnical report that give 2 different allowable axial capacity. The report gives one value for static loads and a lower value for seismic loads. It does not mention wind loads. We...
I have a building that is 326' to the roof. The owner wants to put the cooling towers on the roof and hide them by extending the parapet up 30'. When I calculate the wind loads on the parapet using MWF pressures, the total base shear is 2700 kips with 631 (23%) being applied at the roof due to...
I have a unusually condition where I am anchoring into an existing side of an concrete beam. The the center of the anchor plate aligns with the center of column above and below the beam. I would have said I am anchoring into the side of the column except the column is set back 2" from the face...
I am designing a mat foundation using SAFE. We have significant overturning issues and are considering using rock anchors into the bedrock that our foundations are bearing on. We are wanting to model the rock anchors as springs. We are looking at #10 bar. How would you determine the spring...
I am looking for a design guide for designing concrete elements using a strut and tie model. Does anyone know of such a guide. I have looked and have not found anything that is really gets into the weeds of the method. They did not teach this 30 years ago when I was in school and the ACI code is...
I have a steel column that will be supported on a concrete slab supported on a 24"x24" concrete column. The dropped panel at the top of the concrete column is 16" deep. There has been much discussion in our office of what the bearing capacity of the concrete. The discussion basically comes down...
Can anyone tell me the history of when torsional irregularity was 1st introduced into the building code and more specifically why was the 1.2 limit of (delta max/delta avg) chosen? I cannot see how the difference in deflection at the ends of the building only determine if the building is...
