C.20.11 - Stair Construction¶

The following models are available:

C.20.11.001a | Prefabricated steel stair with steel treads and landings with seismic joints that accommodate drift.

Flexible stair with seismic interstory slip joint.  Steel prefab stringers, steel or concrete filled pan treads.
Construction Quality: Normal
Seismic Installation Conditions: All
Notes: User to provide median demand and dispersion values.  The values listed are default PACT values and do not represent the response of this component.

Suggested Block Size: 1 EA (round up to integer quantity)

C.20.11.001b | Prefabricated steel stair with steel treads and landings with no seismic joint.

Flexible stair without seismic interstory slip joint.  Steel prefab stringers, steel or concrete filled pan treads.
Construction Quality: Normal
Seismic Installation Conditions: All
Notes: Confirm median demand and dispersion values

Suggested Block Size: 1 EA (round up to integer quantity)

C.20.11.011a | Non-monolithic precast concrete stair assembly with concrete stringers and treads with seismic joints that accommodate drift.

Rigid stair with seismic interstory drift joint.  Precast concrete stair.
Construction Quality: Normal
Seismic Installation Conditions: All
Notes: User to provide median demand and dispersion values.  The values listed are default PACT values and do not represent the response of this component.

Suggested Block Size: 1 EA (round up to integer quantity)

C.20.11.011b | Non-monolithic precast concrete stair assembly with concrete stringers and treads with no seismic joint.

Rigid stair without seismic interstory drift joint.  Precast concrete stair.
Construction Quality: Normal
Seismic Installation Conditions: All
Notes: Confirm median demand and dispersion values.  Base document noted that there was insufficient data to establish median demand or dispersion values.  The median demand and dispersion values listed are from a best fit approximation of the data performed by MKA.

Suggested Block Size: 1 EA (round up to integer quantity)

C.20.11.021a | Monolithic cast-in-place and precast concrete stairs with seismic joints that accommodate drift - replace in kind if replacement is required.

Cast in place concrete stair, with seismic interstory drift joint
Construction Quality: Normal
Seismic Installation Conditions: All
Notes: User to provide median demand and dispersion values.  The values listed are default PACT values and do not represent the response of this component.

Suggested Block Size: 1 EA (round up to integer quantity)

C.20.11.021b | Monolithic cast-in-place and precast concrete stairs with no seismic joints - replace in kind if replacement is required.

Cast in place concrete stair, no seismic interstory drift joint
Construction Quality: Normal
Seismic Installation Conditions: All
Notes: User to provide median demand and dispersion values.  The values listed are default PACT values and do not represent the response of this component.

Suggested Block Size: 1 EA (round up to integer quantity)

C.20.11.021c | Monolithic cast-in-place and precast concrete stairs with seismic joints that accommodate drift - replace with prefabricated steel stair if replacement is required.

Cast in place concrete stair, with seismic interstory drift joint
Construction Quality: Normal
Seismic Installation Conditions: All
Notes: User to provide median demand and dispersion values.  The values listed are default PACT values and do not represent the response of this component.

Suggested Block Size: 1 EA (round up to integer quantity)

C.20.11.021d | Monolithic cast-in-place and precast concrete stairs with no seismic joints - replace with prefabricated steel stair if replacement is required.

Cast in place concrete stair, no seismic interstory drift joint
Construction Quality: Normal
Seismic Installation Conditions: All
Notes: User to provide median demand and dispersion values.  The values listed are default PACT values and do not represent the response of this component.

Suggested Block Size: 1 EA (round up to integer quantity)

C.20.11.031a | Hybrid stair assembly with steel stringers and concrete treads and landings with seismic joints that accommodate drift.

Stair consists of steel stringers with precast treads rigidly linked to stringer
Construction Quality: Normal
Seismic Installation Conditions: All
Notes: User to provide median demand and dispersion values.  The values listed are default PACT values and do not represent the response of this component.

Suggested Block Size: 1 EA (round up to integer quantity)

C.20.11.031b | Hybrid stair assembly with steel stringers and concrete treads and landings with no seismic joints.

Stair consists of steel stringers with precast treads rigidly linked to stringer
Construction Quality: Normal
Seismic Installation Conditions: All

Suggested Block Size: 1 EA (round up to integer quantity)