Recent content by SilverBeam75

Hi, I have a slab on grade 8'' thick and it will carry heavy vehicle loads, I have specified 15M rebar @ 12'' c/c in each direction. My client is asking me to provide an alternative using fiber steel reinforcement. My question is, how do you calculate it ? what would be the equivalent to 15M ?

Hi, I have an existing 6 inch slab on grade. I want to know if it can support a linear loading. The equipment that I have to support sit on a steel "W" beam width of 5 inch. The load carried to the slab is 25 kip /ft. How do you evaluate if the slab can carry such load ? Thank you for helping

Thank you all for the help. But finnaly the LVL had to much depth and it wasn't accepted. We have decided to put 2 steel channels C9x15 back to back and bolted through the wood beam.

Hi, I have a concrete tank 4 feet underground. On the top heavy vehicles are present (air plane). The concrete wall tank has an height of 5 feet. How do you determine the moment acting on the wall ? Vehicle load (aireplane): 24 000 psf

Thank you all for the tips, I guess you cannot design it and verify it on paper you need real life testing. As suggested by Ron, is it ok to assume if the tire is inflated at 295 psi and the total contact surface is 100 sq.in you get a force of 29.5 kips, Is it ok to apply this force on the HSS...

Gtaw, thx for the help, but still I'm not sure about my verifcation, should I consider the HAZ ?

Hi, I have a verification to do on a traffic light truss (span of 90feet) The truss is made of 6061-T6. What will be the value of the Fy for the calculation? Will you use a value of 35 ksi or will you consider it welded and reduce it to 15 ksi ?

Hi, If I have a slab 6in thick on a soil with Kwinkler = 100 pci and a live load of 150 psf. How do you evaluate the ground stress and the slab concrete stress ? Thank you, SilverBeam75

Hi, I have a one story URM building that I have to analyse using ETABS. How do you model the walls in ETABS ? The unreinforced masonry consists of 12'' hollow concrete blocks. If I use a SHELL element of 12'', it will act as a plain concrete wall, what do I need to change to have an...

Hi, In seismic design, it is required to have a mass participation ratio of 90%+. My model has 75%, what should I do to increase it ? What exactly does it means? Any help would be appreciated

Hi, Maybe a narrow modification factor must be applied ?

I have two (2) anchors with a distance of 8'' between them and it is installed on a 12 in wide strip concrete wall. The anchor embeddement is 12'' deep. I've used a software for anchor analysis and it indicate a PROJECTED AREA FOR GROUPS OF ANCHOR "An" 77.5 in^2. I'm unable to verify it. What...

Hi, I'm using SAFE 12, and I have a hard time trying to model a slab on expansive soil. I have an uplift linear load only on the perimeter beam of the slab. The super imposed dead weight is not enough to counter the uplift pressure. I have defined a spring value (compression only) and my load...

Thank you for the advice. I will investigate...

Yes the uplift is from the soil (expansive clay) it only affect the perimeter of the slab (2 feet wide) So this why I use a beam, I'm adding some stiffness