Thanks for the quick reply, Josh.
If I'm understanding you correctly, you're saying the solution is apply the tributary seismic weight as a Dyn Mass line load to the floor along the respective walls? This vertical Dyn Mass load is then incorporated into the base shear calculation, same as the...
This is a problem I've been dealing with as a long time RISA3D user, accustomed to calculating lateral forces separately and applying them to the model. RISAFloor will calculate seismic mass and base shear, allowing you to push this through to RISA3D for design. The trouble I'm having is with...
Does anyone have a good source for the self weight of a typical CFS Roof Truss, and have so far been unlucky. Alpine provides approximate values for wood trusses in the "Encyclopedia of Trusses", but I cannot find similar values for CFS. The only thing I have found is a sentence in the same...
In my calculations I followed TMS/TEK method, but the moment and deflection equations for a cantilever with uniform distributed load were used ( Mmax = wl^2/2 and DELTAmax = wl^4/(8EI) ) so that shouldn't be responsible for the discrepancy in results. I haven't considered the effect of the...
Thanks for the suggestions.
I've unchecked the option for using cracked sections under the Concrete tab of the Model Settings. Mcr based on TMS is 7.3 kip-in and Mser is only 3.0 kip-in in this case, so the wall needs not be analyzed as a cracked section. Also realized I've assigned the...
I'm designing an interior 8" NLB CMU wall, and I'm not sure why my deflection in the RISA-3D model is so large.
As a cantilevered interior wall I've got:
8" CMU
48" c/c grout & reinforced
DL = 70 plf downward from a metal stud/gyp. board wall on top of the CMU wall
LL = 5 psf lateral interior...
The difference between the curved model and a straight girder model is significantly different - 2x Shear and 5x Bending Moment on the curved model compared to the straight girder. Makes me more skeptical that there isn't an issue with the curved model, at the midpoint the CL of the curved beam...
Looking at adding equipment loads to a 40+ year old design made up of continuous reinforced concrete girders atop rc columns. The girders I'm looking at now are at an 84' radius cl, spanning 22' c/c across the columns. Girder is 12" wide and 24" deep. Hope this will help anyone picture the...
