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...
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.
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"...
I am checking a existing twin cell box culvert for new loads. In AREMA there are formulae given for moment calculations. Moment of inertia of box culvert top slab gross section is equated to Isubscript S. Moment of inertia of box culvert wall gross section is equated to Isubscript W. I am...
I am designing a wall around existing pipe through which liquid passes at 200degrees fahrenheit. What precautions should I take for laying concrete. Should I install any sleeves?
I am designing fire prevention system for oil tank. The fire prevention system has 10" & 6" lines at 3rd level i.e. 24ft above grade and 24" from top. (Ht of tank is 48' and dia is 220'). The hangers need to be attached to the shell. The shell is designed for hoop tension and the...
In section 6.6 of the design of welded structures there is a formula for Calculating Tangential Tensile Force T=K1*f1 K1 is dependent on the no of hangers and Table I gives the values for no of hangers upto 8. Does anyone what are the values beyond 8.
I am modeling a Truss in RISA. I am using WT members as Braces. These braces are modeled with Flanges horizontal for horizontal braces. As they are connected to Gusset plates there may be bending due to eccentricity. Can this be taken into account by the model. If not what should be remedial...
How do I model the above in Risa. I modeled them as eyebars and they are not failing or bearing any load. However they are showing huge deflections of the order of 80 inches for a length of 25 ft.
I have some drawings which show a 96" concrete pipe erected in 1946. Now the client wants to add a 24" pipe to the 96", by making a opening. Where can I get details of this pipe? Drawings just show Extra strong reinforced concrete pipe.
