Hi, everyone. I am designing a silo footing, say 18 ft x 18 ft, and 2 foot thick. There is a 58 foot tall silo on my footing. Forces acting on my footing include the dead and live loads of the silo. I have wind and seismic loads on my silo, too, resulting in base shear and overturning moments...
I need to size some footings for preliminary estimate purpose? What is the best way to go about this. I have seen some engineers use the tributary area to come up with a approximate footing size. Uplift due to seismic, wind, etc. was estimated at 30 #/SF and the dead load was estimated at 10...
I need to size some footings for preliminary estimate purpose? What is the best way to go about this. I have seen some engineers use the tributary area to come up with a approximate footing size. Uplift due to seismic, wind, etc. was estimated at 30 #/SF and the dead load was estimated at 10...
Could someone point me a source for USGS information on SDS, SD1, etc. for a particular location? I believe that USGS used to have hazmaps where you can provide a location by its coordinates, and you can get this information. That website was recently disabled, if I am not mistaken. However...
Hi everyone,
I have got a question of defining DJ1 and DJ2 in STAAD? As you might know, DJ1 (start node) and DJ2 (end node) are used in conjunction with the deflection (DFF) command in calculating beam deflection. Beams in STAAD are very often made up of multiple members, and DJ1 and DJ2 are...
Could someone please provide me a quick, if preliminary, formula for finding the area of steel required for a foundation, for instance, if I have the factored moment, effective depth and width. Please also provide the reference for the formula. My fc' is 4000 psi. I am
thinking that
As =...
I need to resolve a question about the use of load combination and/or load factors in the design of a reinforced concrete footing. Say I need to design both the size of a footing, as well as the design the steel reinforcement, both simple and regular enough. Now, sizing of the footing is done...
I have a question about the use of load combination and/or load factors in the design of, say, a reinforced concrete footing. I will need to size an adequate footing, as well as to design the steel reinforcement. Now, sizing of the footing is done using service loads, while the reinforcement...
Is it possible to assign the Steel Design Values to my Members in the Modeling Mode. Let me elaborate. When I first start modeling my structure, I obviously do not know what member sizes are required, and it is not important to know in most cases. I assign a member size that I think is...
What tension load to design column splice for? I am designing column splices for my power station structure. Now, there is significant axial compressive loads on my columns, but not very large tensile loads (say, less that 35 kips). Is there a minimum tensile load that I should design my...
I have a question about Hanger-Type connections for fasteners loaded in tension on Page 4-89 of AISC Manual 9th Ed. How do you use the Preliminary selection tables tables? It is for Structural Tee or double-angle hangers, and loads in kips per linear in. for trial selection are provided. Now...
Could someone familiar with the concept please elaborate on "Transfer Force"? It is normally designated as:
/___
/
Its units are Kips or KN. Normally, we place the "transfer force" on a connection between two horizontal members in structural drawings to indicate what the connection has...
My reinforced concrete slab on grade is approx.
30 meters by 8 meters. Thickness is 150 mm.
Design bearing pressure is 120 KPa. The only
loads on my slab or spread foundation is the
own self weight (reinforced concrete) and some
fluids loads, as this foundation is being used
for...
Under what conditions do I need to manually check for flexure at the edge of base plate? When P is high? When -P is high? When anchor rods are located "outside" the col? All the time? Have the design examples provided in the SDG's (both 1st and 2nd ed) already considered this?
