Presets

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Special Presets

Special presets for unique configurations that don't fit the standard joist or beam categories.

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Generic Beam

Flexible configuration with minimal defaults. Best for custom scenarios where you want full control.

Preset Code: genericBeam

Default Values

None - all values must be specified explicitly.

Required Fields

Attribute	Description
L_X	Beam length in feet
type	"Database" or "Custom"
supports	Support array (minimum 2)

Example

Code
 
{
  "preset": "genericBeam",
  "attributes": {
    "L_X": 20,
    "member": "4x12 D.Fir-L No. 1",
    "supports": [
      ["Pinned", 0, 5.5],
      ["Pinned", 20, 5.5]
    ],
    "loadsConc": [
      ["Point Load", 10, {"D": [1000, 0], "L": [2000, 0]}]
    ]
  }
}

→ Try in API Reference

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Generic Flitch Beam

Steel-reinforced timber beam (flitch plate) configuration. Flitch plates are enabled by default.

Preset Code: genericFlitchBeam

Default Values

Attribute	Value	Description
flitch	"Yes"	Flitch plates enabled
n_flitch	2	2 steel plates
t_flitch	0.375	3/8" plate thickness
F_y	36000	36 ksi yield strength
flag_SD	"Yes"	Simplified deflection enabled
Delta_Span_DL+LL	240	L/240 simplified

Flitch Plate Attributes

Attribute	Type	Default	Description
flitch	string	"Yes"	Enable flitch plates: "Yes" or "No"
n_flitch	number	2	Number of steel plates
t_flitch	number	0.375	Plate thickness in inches
d_flitch	number	auto	Plate depth in inches (auto-calculated if omitted)
F_y	number	36000	Yield strength in psi

Example

Code
 
{
  "preset": "genericFlitchBeam",
  "attributes": {
    "L_X": 20,
    "member": "4x12 D.Fir-L No. 1",
    "n_flitch": 2,
    "t_flitch": 0.375,
    "d_flitch": 11,
    "F_y": 36000,
    "supports": [
      ["Pinned", 0, 5.5],
      ["Pinned", 20, 5.5]
    ],
    "loadsConc": [
      ["Point Load", 10, {"D": [2000, 0], "L": [4000, 0]}]
    ]
  }
}

Use Case: Flitch beams combine timber and steel for increased capacity in retrofit situations or where depth is limited.

→ Try in API Reference

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Hip / Valley

Configured for hip and valley rafters with dual roof pitches.

Preset Code: hipValley

Default Values

Attribute	Value	Description
incline_flag	"Hip/Corner Slope"	Hip/corner geometry
n_com	2	2-ply beam
L_side_1	10	10 ft side length
alpha_roof_1	6	6:12 pitch (side 1)
alpha_roof_2	6	6:12 pitch (side 2)
location_based_on	"Plan"	Plan-based locations
repeat	"Non-Repeating"	Non-repeating member
LTB_bracing	"Top Braced"	Top edge braced
LLT	"Occupancy"	Live load type
Delta_Span_ST	180	L/180 short-term
Delta_Span_LT	120	L/120 long-term
Delta_Span_DL+LL	100	L/100 simplified
flag_SD	"Yes"	Simplified deflection enabled
doubleCantileverDeflection	"Yes"	Double limits for cantilevers

Hip/Valley-Specific Attributes

Attribute	Type	Default	Description
incline_flag	string	"Hip/Corner Slope"	Must be "Hip/Corner Slope"
L_side_1	number	10	Side length 1 in feet (determines beam geometry)
alpha_roof_1	number	6	Roof pitch 1 as rise per 12 run
alpha_roof_2	number	6	Roof pitch 2 as rise per 12 run
location_based_on	string	"Plan"	"Plan" or "Inclined" length

Load Format

Hip/valley uses explicit tributary width format:

Code
 
["Label", startX, endX, TW_start, TW_end, {magnitudes}]

Tributary width typically varies from full width at the ridge to zero at the eave.

Example

Code
 
{
  "preset": "hipValley",
  "attributes": {
    "L_side_1": 12,
    "member": "3x10 D.Fir-L No. 1",
    "n_com": 2,
    "alpha_roof_1": 6,
    "alpha_roof_2": 6,
    "supports": [
      ["Pinned", 0, 3.5],
      ["Pinned", 17, 3.5]
    ],
    "loadsDist": [
      ["Roof Load", 0, 17, 12, 0, {"D": [20], "S": [30]}]
    ]
  }
}

Note: The beam length is calculated from L_side_1 and the roof pitches. The tributary width typically decreases linearly from the ridge to the eave (12 to 0 in the example above).

→ Try in API Reference

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Next Steps

• Joists - Floor, ceiling, deck joists, and rafters
• Beams - Girders, headers, and combination beams
• Attributes Reference - Complete attribute documentation