This is my gripe with ASCE. I will never join them. AISC has a ton of free stuff for members. All PCI journals are freely accessible. How come ASCE keeps their decade old journals still out of reach. The best way to publicize is like AISC. I perfected the steel design by joining them and...
As per this section "If drain pipes are used around the tank perimeter, they shall be at least NPS 1 in diameter and have a minimum
wall thickness of Schedule 40. The pipes may be perforated in the undertank area to improve their leak detection
function. The inner ends and perforations of the...
I am designing a bridge which is of 4 spans and the seismic zone is 1. The total weight of superstructure is around 2000 kips( 200' length , 4 spans)and all the beams are on elastomeric bearings. When I am checking for a pier what is the lateral load I should use. As per sec 3.10.9.2 my As...
I am checking a 28k10 joist for additional loads. However the joist is failing in shear. What is the best remedial measures that should be adopted? I am enclosing the joist calculations for reference. Any help is appreciated.
I had modeled a conical roof and I checked the stresses with API 620. The results are way off. Can somebody highlight where I had gone wrong? I had attached RISA model with Hand calculation. The bottom dia is 12 ft and the top dia is 1 ft and the height is 1 ft. The Live load is 25 psf. The...
The roof is for a silo. The existing roof is considered too soft by users(10 gauge steel). The roof is at a slope of 1:6 and the dia is 12 ft. I am trying to find deflection and stress for considered load of 300lb at center and udl of 20lb/sft. Roark's stress and strain book does not have a...
Sliderule
What were your assumptions in getting this .086 answer? Do you mind sharing this calculation? On a side note I need to thank you for all the rare information available on your web site.
I am modeling a monorail in RISA. The monorail is S12 X 35 with C10 X 15.3 cap welded on top. The way I modeled is I created a new section and input the salient properties i.e I,Z,A,d. These values were calculated on basic principles. The other properties I used some approximate values. The...
We were checking for a large lift where the load is heavier than 100 kips. The velocity with which this load is placed on the support is 20ft/min. How do we calculate the impact load. I tried to equate the kinetic energy to strain energy. However this produces an impact factor of greater...
In API code for designing foundations for machinery(Pumps) there is a code requirement that the width of foundation should be atleast 1.5 times the dist from base to Centerline of Machinery. Is the base the bottom of concrete or the base plate of the machinery
There is an empirical rule that the weight(mass) of the foundation needs to be 3 times the machinery (API). How should the weight be calculated? Is it below grade only? If so is there any clarification any write up or commentary any where.
I am checking a Asphalt Tank with Temperature at 280F resting directly on 6" slab with reinforcement at top with a cover of 2". How can I calculate thermal stresses or crack widths? ACI code drew a balnk.
Sorry. In my eagerness to reply I did not mention clearly that the second edition of the book Unified Design of Steel Structures refers to the Steel Construction Manual 14th Edition.
Nobody has mentioned a book by Louis Geschwinder Unified Design of Steel Structures. The second edition refers to 14th Edition. I really think it is the best book.
I have two questions regarding Anchor rod.
The first question is if I use a sleeve will the effective length decrease by the sleeve length.
The second question is
a)if you use 4 bolts ( bolts are equidistant in both directions)and if the wind is acting perpendicular to two adjacent bolts...
I am checking a boxculvert. It is a twin cell with 27" sidewalls and 18" midwall. The ht is 15' and span is 20' for each cell.The boxculvert supports 19.5 ft soil on top. The top slab is 42" and has #11@6" for _ve reinforcement and #9@6" for +ve reinforcement. The bottom slab is only 33"...
