1. Anchor
Channel Systems
2. HAC
Portfolio
3. HAC
Applications
4. Design
Introduction
5. Base material
6. Loading
11.5.1 COMPOSITE SLABS
Composite slabs are one of the most common methods of steel frame floor construction; therefore, it is common substrate
for anchor channels. Naturally, the use of anchor channels in composite slabs may bring additional challenges, especially for
applications where anchor channel with rebar anchors or shear confinement plate is required.
9. Special Anchor
Channel Design
10. Design
Software
11. Best
Practices
12. Instructions
for Use
13. Field Fixes
14. Design
Example
11.5.2 ALL-LIGHTWEIGHT
CONCRETE VS
SANDLIGHTWEIGHT
CONCRETE
ACI 318 and AC232 provide a modification factor for lightweight
concrete (λ). Light weight concrete is sub-classified into two
types; all-lightweight concrete and sand-lightweight concrete.
The modification factor for all-lightweight concrete is equal to
0.75 while the modification for sand-lightweight concrete is
equal to 0.85.
Addressing the following potential conflicts before installation of the anchor channel system takes place may avoid issues, field
fixes, and speed up the installation. Moreover, each condition can be evaluated based on actual conditions.
8. Reinforcing
Bar Anchorage
11.5 SUBSTRATE CONSIDERATIONS
7. Anchor Channel
Design Code
POTENTIAL CONFLICTS ARE AS FOLLOWS:
• Clashing of rebar with column
• Clashing of rebars with metal deck
• Corner conditions at corner columns
• If rebars extend into the deck, check adequacy of rebar cover.
The use of lightweight concrete in composite slabs is quite
common. Generally speaking, anchor channels are constrained
by the strength of the concrete. Lightweight concrete is
commonly specified for composite slabs. Hence, the concrete
strength due to an anchor channel is constrained even further. It
is always a good practice to verify the type of concrete specified
in the project. On one hand, simply assuming sand-lightweight
concrete can result in unconservative results. On the other
hand, assuming all-lightweight concrete when sand-light weight
concrete is present can yield to more expensive designs.
Chapter 5 (Base Material) provides additional information
about all-lightweight concrete and sand-lightweight concrete.
Determining what type of lightweight concrete use can present
a challenge, as this information is not clearly specified all times.
Aggregate grading
specification
Concrete unit weight pcf
Normal-weight Fine: ASTM C33
Coarse: ASTM C33 145-155
Sand-lightweight Fine: ASTM C33
Coarse: ASTM C330 105-115
All-lightweight Fine: ASTM C330
Coarse: ASTM C330 85-110
ASTM concrete type
Determination of lightweight concrete type
1) Check General Notes of project’s structural drawings.
2) Check concrete specifications of the project.
3) Reach out to the structural engineer of records for
confirmation.
Anchor channel in composite slabs; face of slab application
356
If there is project where there no enough evidence to support
the use of sand-lightweight concrete for design purposes of the
cast-in anchor channel, always assume all-lightweight concrete,
as this is always the most conservative choice.
Anchor channel in composite slabs; top of slab application
Cast-In Anchor Channel Product Guide, Edition 1 • 02/2019
357