Hi!
We know well embed plates will expand and concrete sometimes cracks due to excessive welding heat.
Is there any method to check if welding heat will cause concrete spalling around the embed plates?
Based on this method, can I decide plate size in addition to stress/strength analysis to avoid...
Many tests released in the PCI Journal shows diagonal cracks.
But, this case shows almost horizontal crack.
Isn't it separation failure (hanger reinforcement required) between nib (upper portion) and dap (bottom area)?
This crack itself is local issue (connection design) rather than global issue.
Unless you can access to bearing plate design, it's difficult to evaluate analytically.
This is a kind of improved design method or sophistication of existing knowledge.
Currently bearing pad design issue is not cleared completely yet.
I guess ROF is more popular than plain elastomer bearing in the parking structure double tees.
Here is my personal solution/suggestion.
I am looking forward your comments.
1. All these double tee bearing connection movements are dynamic
due to vehicular impact load, thermal change, member cambers, etc.
2. Providing uniform loading conditions is expensive and hardly practical.
3...
Sloped bearing corbels in the litewall and sloped ledge in the spandrel?
Are those special treatments worthy effort?
Economy and production efficiency due to non-rectangular forms should be considered.
I understand similar issue could be critical in the bridge industry with heavier loads.
What...
Hello!
These questions are related with precast production efficiency and member design detail.
Double tee floors are sloped everywhere in the precast concrete parking structures;
let's assume 60ft long 12DT34 and typical floor slope 2% for drainage.
1. Is it really necessary to make double...
Joe,
But, as DTs can move due to temperature change or applied dynamic loadings,
this rigid restrained welding connection could cause failure around the connection rather than improved stability.
Hello!
Food processing facilities require special finish on concrete wall surfaces.
Where can I obtain detailed information with respect to this issue? FDA?
_JRW
The following info came from PCI committee's report, which I have edited as an example.
Insulation walls can be used for both load bearing and non-load bearing walls.
Composite action with shear connectors may allow this system applicable to high ceiling structures.
I guess similar problems...
Aesur,
I understand your questions and concerns.
I think this area is really tiny niche market, but growing industry.
PCI's committee report "State of the Art of Precast/Prestressed Concrete Sandwich Wall Panels, 2ned Ed." will provide general knowledge.
-JRW
Hello!
I am looking at 8" think precast prestressed concrete insulation wall design ONLY with strands and shear connectors.
(No WWR or additional reinforcement except solid zone around stripping/handling anchors.)
As strand layout was decided for the wide pieces with opening in the middle of...
