There seems to be different methods for combining the Mxy values with the Mx and My values; the "simple" method and then methods such as Wood & Armer? The simple method, best I can tell is:
Mxdesign = Mx +/- Mxy
Mydesign = My +/- Mxy
I am assuming the sign convention for the Mxy value is the...
Does the Von Mises stress have an application in concrete? I am specifically looking at a notch in a vertical wall of a cylindrical tank. The intent of this tank is that it be watertight. Its easy to reinforce in both principle directions within a few inches of the edge of the notch. Obviously I...
Is anyone installing membrane slabs? ACI 350 seems to encourage thinner slabs as they are more flexible. We have been using 5" slabs for years for our agricultural tanks but using the subgrade drag theory for the amount of reinforcing required. This theory has been removed from ACI 360. This...
We are still having trouble with a single phase 230v 60hz 10hp motor. It occasionally trips the thermal reset. I posted last year the following thread: thread237-317705
Yesterday we ran the motor for the first time since last year. It is used in a maple sugar operation. The motor operates a...
We recently installed a single phase, 10hp, vacuum pump. It has a Lavato thermal overload relay. It has a amperage range of 37-50 amps. The adjustment dial is set for the FLA rating of 50 amps. The relay keeps tripping. The first time you start the motor it will run for 4 or 5 mins and then...
The attached sketch shows two buildings that by ASCE 7 definition are considered enclosed buildings. When designing the MWFRS, the wind loads are applied to the "projecting area" according to figure 6-9 of ASCE 7-05. Even though the pole building has open area, I have been applying the loads to...
Is anyone familiar with this document? We use this design procedure for posts for agricultural type pole buildings. Typically we design the posts as unconstrained without collars. This case is pretty straight forward. The problem I am having is the case of an unconstrained post with a concrete...
It appears to me that it is acceptable to use Grade 1,2,5 & 8 SAE J429 bolts in wood connections, according to NDS '05. Appendix I.4 addresses this topic. Is this correct? I have attached a CADD detail of a connection I have designed. This connection is used to connect the hoop truss of a fabric...
Can anyone confirm that a 3 1/2" nominal, x-strong pipe has a wall thickness of 0.318 inches? I have the older 3rd edition of the AISC Steel Manual. I am being told the newest edition, the 13th, has a different wall thickness.
thread507-8985
I have seen several threads on the design of posts embedded in concrete but none seem to list a design procedure or method of analysis. The post could be wood or steel. ASABE EP486 has a procedure for posts embedded in the ground. Seems this procedurre would be reasonable to use...
