Hello,
One of my storage tanks has significant column deflection, approximately 12" from top to bottom. The rafters and columns are laid out in the attached photo.
Question: what is the K-value for checking the buckling or unsupporting length of the column?
I think the K-value should be 1.2...
Hello all,
I need to estimate the allowable soil bearing capacity of the existing grade for a crane pad.
I know the ground bearing pressure excerpt by the crane from the lifting study.
I have a couple of boreholes (within 100m) of the crane pad location. Borehole shown material of each...
Hello,
I’m new to the above ground storage tank.
I’m looking for a design guide for spiral staircase on storage tank.
1. When to use staircase vs ladder? Please provide reference.
2. Min & max dimensions of run and riser. Max landing distance. Min stair case width. Do we have to follow OHSA...
We are working on an old refinery. The existing piperack was built in 1945 with Standard Oil Co. specs. We are unable to locate the spec.
By searching around, our best guess the material for steel pipe that time was either ASTM A53 or A7, the Fy= 35ksi.
Do you have AISC ASD 4th edition? I hope...
Hello,
has anyone used TSTOWER FOR SELF-SUPPORTING LATTICED TOWERS. I have read the manual and tried to understand the differences between "LEG REACTION DATA" and "TOWER FOUNDATION DATA"
Which one is used for foundation design ? and why the download/uplift from Leg reaction data different than...
Hi all,
I'm designing drop-in concrete anchor for new vibration clamp on existing vibration pipe. The vibration clamp is directly installed on existing concrete column with drop-in anchors.The anhor is under dynamic (cyclic) load (1000 lbs p-p).
I'm confusing on using type of anchor, undercut vs...
I have a case that the support can move in X and/or Z direction to a maximum of 6mm, i.e delta X or delta Z < 6mm, there will be no reactions in X or Z. If delta X or delta Z > 6mm, then I will have reactions on support.
How do I model this type of support in staad ?
I appreciate your input...
Hi all, this may be old to someone but i need your input on frost heave design for my foundation.
I'm designing an unheated structural slab supported on piles. Design depth of frost penetration is 2700mm from soil report. I'm going to use Dow ethaform void form but i dont know how to calculate...
I'm looking for the sketch or dwg that show the detail of hinged grating cover. Basically, I have a ladder going down from grating floor to the slab below ( 6m high). I need to provide the grating cover the opening for the ladder. This grating cover can be lift up with hinged end.
Any link or...
Hi all,
We design foundations of the oil tanks (diameters vary from 30-55m, height 12-13m) sitting on gravel foundation. and the problem come to decide if we use geotextile as a secondary liner of the tank below 5 feet depth of gravel fill, if the tank bottom temperature constantly 90 degree...
The embedment of the H steel pile into pile cap for transfering load can be based on the CSRI handbook or discuss in thread 256-152354 , about 6" and no need the cap plate. But the topis for circular I could not find any where.
Normal practice from my company is the base plate as in column but I...
We have a oil tanks of about some 150ft diameter and 40ft heigt, and rested on the 1m thick of 80mm minus gravel pad, and the edge is either reinforced with 1.5m thick of 40mm minus gravel ring or concrete ring wall. There also two columns support the roof of the tank. Do you think that under...
Hi,
may be a dump question since I am structural engineer not pavement or geotech, but I have to check the bearing capacity and settlement of the structures on the compacted engineered fill. My question is what is the difference between the well graded gravel bearing capacity, i.e. 80mm minus...
Hi all,
We design foundations of the oil tanks (diameters vary from 30-55m, height 12-13m) with concrete ring walls (the ring wall is required for uplift resisstance). Inside the ring wall the bottom of the tank is rested on the 80mm minus run gravel compacted to 100% SPMDD, with thickness of...
Hi all,
I model my concrete structure with solid elements in STAAD. How can i use stresses output results (corner stresses & centre stresses of element) to get bending moment, shear and Axial forces. From there I can design reinforcement.
Any references and examples will be very appreciated.
Hi all,
I model my concrete structure with solid elements in STAAD. How can i use stresses output results (corner stresses & centre stresses of element) to get bending moment, shear and Axial forces. From there I can design reinforcement.
Any references and examples will be very appreciated.
I'm going to design the curb or bollard in the mine site which is have high potential of hitting by 100Ton truck. anyone has an ideal, specification or clause in the ACI, IBC or in AASHTO discussion on this matter.
Also need your advice on how height of the curb (let say at least 1/2 dia. of...
Hi all,
Anyone has experience how to model column (W and HSS section) to gether with base plate which is sitting on conrete pedestal ?
Normally, i model my steel structure have a support at the end of my column.
Any suggestion or if you already did one b4, pls email a staad file for reference...
