Any recommendations on a good quality, commercial grade, spray-on brick waterproofer? Must be waterproof, breathable and not affect color. Prefer 10 to 15 year guarantee.
Although I mainly deal with buildings and static loads, I recall the need to use balanced welds (about the member centroid) for truss connections that have repetitive loading (such as vehicles). I see this also referenced in Ex. 17, Appendix K, AISC 9th Edition. I assume the stress level...
It is desired to use an existing composite concrete slab poured over "Cofar" composite metal deck (with wires welded to deck) for infrequent vehicle traffic. We know from fatigue tests of the more modern composite deck (with pattern indentations) that repetitive wheel loading can cause a loss of...
We are doing preliminary work on a large steel frame building that will be divided into 4 quadrants by expansion joints. We are weighing the pros and cons of using double columns versus single columns with brackets.
Obviously, double columns take up more floor space, but are more capable of...
ACI tells us to moist cure 5 days at 70 degrees F or 7 days at 50 degrees F for standard 28 day concrete. What about high early concrete that fully matures in say 7 days or 10 days? What duration of moist curing should be used? Any guidelines? Can I proportion the required cure times or is there...
Load Combo 6, does not make sense! It adds in LL but then uses E based on sustained load not necessarily the full LL.
Would it make more sense for Combo 5 and 8 to be based upon E1 (Eq based upon a portion of DL only which is sustained) and combo 6 based upon Eq using full DL+LL?
Has anyone on this forum ever done a post tensioned, free standing firewall in precast concrete or concrete block? Just looking for some alternatives to conventionally reinforced, free standing masonry.
We do a number of tank foundations with various types of containment and spill protection. Containment being defined as something holding a liquid. Spill protection meaning walls and base slab used to direct a liquid to a containment area.
We are having a difference of opinion in our office as...
I do not have my old "H" joist catalog with me. I need the listed maximum load capacities for the following "H" series joists:
22H6 30' span
22H9 40' span
24H10 45' span
14H3 17' span
Thanks in advance!
For a typical 3 span gable roof PEMB frame, what are the designer's assumptions: The interior pipe columns pinned top and bottom and all the lateral load carried by the exterior tapered columns? or all columns (interior and exterior) work together to resist lateral loads in frame action?
Is it structurally feasible to substitute 400 series stainless for 304, assuming that we would spec the same strength?
Is there any cost advantage in using 400 series stainless instead of 304?
I am thru bolting the stem of a precast prestressed double tee to support a hanger. I am trying to calculate the shear breakout force of the bolt but am wondering if the bottom of the tee goes into tension and thus reduces the allowable shear.
Can I use 2 x sqrt of F'c per 11.4.1 for the min...
What document do I look in to find a 24 hour storm event for a particular part of the US? Does it give me some many inches of rainfall in a 24 hour period?
Do equipment platforms (used to service equipment or controls) have to be designed to the governing building code? These are either built off of equipment or adjacent to equipment. Normally, they are unoccupied.
