As per FEMA 273 para 5.2 (Historical Perspective-Steel and Cast Iron), the material used in older construction is likely to be mild steel with a specified yield strength between 30 ksi and 36 ksi. From Table 5-2, structural steel dated 1961 and on have an expected yield strength ranging from 30...
Look into ASME B30.9-1996, B30.9a-1997, B30.9b-1998 and B30.9c-2000 for the manufacture of wire rope slings. However, when designing there are other rigging considerations such as the "two-leg" rule and sling angle stress.
I don't mean to be technical; however, the crane you are refering to is termed "pillar-jib crane" as the jib is not mounted on a wall or vertical face but a pillar. Considering that you are designing something unfamiliar with, I would suggest subcontracting out to a qualified crane...
beamer,
you can check FEMA 273 for prevailing material properties during that time; however, this is still an assumption. I personally would tend towards material testing.
In some cases, use of the general structural notes is a simplified gist of the specifications of a specific project. One place to start, if I wanted to created the structural notes from scratch, is the Unified Guide Specifications. This is a tri-service (Army, Navy, and Air Force)...
Jae, look at this case. If I had two rebars, a #4 rebar that fully developed at the shear-friction plane and a #5 rebar that did not fully develop, both with the same length. To say, the #4 rebar has a shear capacity and the #5 rebar has no shear capacity is hard to swallow. Not to mention...
To clarify, I was referring to shear-friction action of a dowel bar. Jae, you are absolutely correct. I should have reviewed UBC-97 Section 1911.7.8 on shear friction which clearly states "...shear-friction reinforcement shall be anchored to develop the specified yield strength on both...
haynewp,
When one considers lateral stability, one must look at the bigger picture as well. Yes, some interior columns of the structural system you mentioned will be governed by uplift alone. However, the uplift is a component of the overall structure performing against sliding and...
Thank you all for your enlightenment. I actually have the FEMA documents. Although, I have not had the time to read them.
Possibly, the original designer applied safety factors I am not aware of. In this case, my perspective is to verify if the safety factors, if any, will be enough to deem...
You are right, Jae and Ishvaaag. I'm sorry I referred to the whole section 1921. I was really after the detailing requirement for confinement, section 1630.8.2.2.
Just to give background information. I am designing in Guam. We comply with seismic zone 4 and a basic wind speed of 155 mph...
In UBC-97, another basic sturtural system is mentioned, cantilevered column building systems. I would like to know if ductility or seismic frame requirements (UBC Section 1921) are applicable for the cantilevered column elements. I am applying this structural system to a precast covered...
