I am designing large circular ductwork and am always looking for more good references, especially ones that address stiffening rings. There doesn't seem to be much new out there lately. Most references discuss the need for stiffeneing rings only when there is negative internal pressure. What...
What is considered an acceptable rotational tolerance for the installation of square precast concrete piles? In other words, how much can the pile be oriented from the plan orientation?
Pile caps are usually thick and fairly heavily reinforced for shear and flexural loading. It seems like cracking is not an issue even for a large pile cap (say 40' x 70'). We normally limit the W/C ratio to .45. I am wondering if anyone specifies control joints and if so what is the criteria...
I have a 32ft x 42ft pile cap foundation with a 6" x 6" wide curb all around. The pile cap will be poured first with dowels projecting. The curb will be poured next. It has one #4 bar in the long direction. My question is this: Should I cut control joints in the curb at say 10' intervals or...
What does everyone typically specify for preparation of the sub base under a pile cap? Since the soil is not counted on for bearing support, it seems like a waste to compact it or spend alot of money improving it. There may be some cases where excavation alone will not produce a suitable...
Section D.4.2.2 in appendix D states that the design procedure of D.5.2 and D.6.2 is applicable to anchors with diameters not exceeding 2" and tensile embedments not exceeding 25". This is apparently based on current test data. What does everyone use for anchor rods larger than 2" and deeper...
I have a 32ft x 42ft pile cap foundation with a 6" x 6" wide curb all around. The pile cap will be poured first with dowels projecting. The curb will be poured next. It has one #4 bar in the long direction. My question is this: Should I cut control joints in the curb at say 10' intervals or...
Does anyone know where I can obtain a copy of "Design of Laterally Loaded Piles", Bengt & Broms, Journal of the Soil Mechanics and Foundation, ASCE, Vol 91, SM3, May 1965?
I assume that the seismic load calculated by equation 34-1 in section 2334 is an "utimate load"? The reason I think this is because in section 2338 for non-building structures, it states specifically that "the minimum design lateral forces in this section are at a service level (rather than...
