Add or Modify a Concrete Precast Hollow Core Floor

This dialog can be used to:

define and add a "concrete precast hollow core floor" assembly to a project, or
modify or view "concrete precast hollow core floor" assembly that has been added to a project.
define an envelope for this assembly.

Description / Assumptions / Limits	Required inputs
Concrete, pre-cast Hollow Core Slab Assembly thickness usually ranges between 200 and 350mm and design span ranges from 9m to 17m. 50 mm of 25 MPA or 3000 psi concrete topping is automatically added. Concrete strengths are usually higher than with other concrete floor plate systems (45 MPa and greater) and higher volume flyash levels are usually avoided as these design mixes tend to slow down curing and therefore the batch processing of hollow core slabs. The Number of Bays must be greater than zero. Bay Size must be greater than zero. Design span range: 9.0m - 17.04m for all loads. Span must be greater than zero for all loads. If an entered span is less than the minimum value, a minimum span of 9.0m is used for calculating material requirements. The material requirements are then factored by multiplying the material requirements quantities by the entered span divided by the minimum span.	Name No. of bays Bay size (m) Span (m) Live load (2.4, 3.6, 4.8 kPa)

Description / Assumptions / Limits

Required inputs

Concrete, pre-cast Hollow Core Slab

Assembly thickness usually ranges between 200 and 350mm and design span ranges from 9m to 17m. 50 mm of 25 MPA or 3000 psi concrete topping is automatically added.
Concrete strengths are usually higher than with other concrete floor plate systems (45 MPa and greater) and higher volume flyash levels are usually avoided as these design mixes tend to slow down curing and therefore the batch processing of hollow core slabs.
The Number of Bays must be greater than zero.
Bay Size must be greater than zero.
Design span range: 9.0m - 17.04m for all loads.
Span must be greater than zero for all loads. If an entered span is less than the minimum value, a minimum span of 9.0m is used for calculating material requirements. The material requirements are then factored by multiplying the material requirements quantities by the entered span divided by the minimum span.

Name
No. of bays
Bay size (m)
Span (m)
Live load (2.4, 3.6, 4.8 kPa)

Seismic Note:

There are no seismic adjustments for this assembly.

Field Descriptions:

Name:

Enter a name for this assembly. All assemblies within a project must be uniquely named within each assembly group. Names maybe alphanumeric (e.g., floor 1).

Number of Bays:

Enter the total number of bays as a grid number. (e.g., a grid consisting of 3 bays wide by 3 bays long would equal a total 9 of bays).

Bay Size:

Enter the repeating bay size (main span) in one direction in m or ft.

Span:

Enter the repeating span in the opposing direction of the Bay Size in m or ft.

*See Terminology note below regarding Span and Bay Size entries.

Live Load Field:

Click a radio button to select the live load to be carried by this column and beam assembly system.

2.4 kPa (50 psf) represents a typical roof load for a typical office / residential occupancy condition (above the first floor)
3.6 kPa (75 psf) represents a typical mechanical/service room loading
4.8 kPa (100 psf) would be indicative of heavier floor loads such as assembly areas, balconies/mezzanines, corridors, lobbies/exit areas and storage areas.

Units:

Here you can set the units of measure as either "SI" or "Imperial". Changing the default units here affects only the current assembly but will not override the Default Units of Measure nor the Units of Measure settings for open projects or any other assemblies within open projects.

Floor Area (m2 or ft2) Note:

As a user friendly check, the total floor area calculated by the application (as per the users input) is reported in the bottom left hand corner of the dialog box.

Duplicate Button

Click the "Duplicate" button to create an exact duplicate of the current assembly. The duplicate assembly will be added to the current project. This button is only available when editing or viewing an assembly that has already been saved in the current project.

Delete Button

Click the "Delete" button to delete the current assembly from the current project. This button is only available when editing or viewing an assembly that has already been saved in the current project.

Help Button:

Click the "Help" button to open the Help pop-up window.

OK Button

Click the "OK" button to accept and save the current assembly settings and close this dialog.

Cancel Button

Click the "Cancel" button to discard the current assembly settings and close this dialog.

Terminology:

There is sometimes confusion about different terminology for different structural elements. This software refers to the Bay Size as the length of a beam supported by two columns, and Span as the distance between adjacent, parallel beams (see figure below).

Bay Size and Span will determine the area of one bay. The drawing below shows two rows of bays, and each row is three bays long. The total floor area in the example below is (Bay Size x Span) x Number of Bays (Bay Size x Span x 6).