Design Binderholz Glulam to the NDS

Binderholz manufactures glued laminated timber (glulam) from Norway spruce. In the US it is certified to ANSI A190.1 through the AITC/PLIB Product Report P235-001, with design values per ANSI 117. SPEC Toolbox designs the beams and columns to the NDS, in allowable stress design or LRFD.

The integration covers the Binderholz Norway spruce glulam, grouped by layup.

Balanced (bending) stress classes

• 18F-E3 and 22F-E5 (European equivalents GL28c and GL32c), for bending members, with the higher-grade laminations at the extreme fibres.

Uniform grades

• GL24h, GL28h and GL32h (US combination symbols 100, 101 and 102), for members primarily in tension or compression.

The timbers are Norway spruce in architectural or industrial appearance grades, in depths to 85 in., widths to 12 in. and lengths to 100 ft, plus custom curved beams, arches, glulam trusses and timber decking. Preservative-treated timbers are available to AITC 109 and AWPA U1.

At a glance, in the US scope the Binderholz glulam supports:

• Beams and columns.
• Allowable stress design (ASD) and LRFD.
• Preservative-treated timbers for exposed or ground-contact conditions (AITC 109 / AWPA U1).
• Architectural or industrial appearance grades.

• Balanced and uniform layups. Balanced bending stress classes (18F-E3 and 22F-E5) place higher-grade laminations at the extreme fibres for bending members, while the uniform grades (GL24h, GL28h and GL32h) suit members primarily in tension or compression.
• Large sections and long members. Timbers reach 85 in. deep, 12 in. wide and 100 ft long, with custom curved beams, arches and glulam trusses produced to order.
• Reference design values per ANSI 117. Bending design values reach 2,300 psi and the modulus of elasticity 2.0 x 10^6 psi (GL32h), adjusted per the NDS for ASD or LRFD.
• Preservative-treated option. Timbers can be treated to AITC 109 and AWPA U1, using preservatives and retentions recognized for exposed and ground-contact service.

The Binderholz glulam is available across the SPEC Toolbox member-design modules, worked to the NDS:

• Timber beam and Timber column.

and in the connection modules:

• the screw connection module and the CLT floor-to-glulam beam connection.

Member behaviour is taken from the integrated database with the ANSI 117 design values for the assigned stress class.

Design follows the ANSI/AWC NDS under the IBC and IRC. The glulam is certified to ANSI A190.1 through the AITC/PLIB Product Report P235-001, with reference design values per ANSI 117 for the balanced stress classes (18F-E3 and 22F-E5) and the uniform grades (GL24h, GL28h and GL32h). These are adjusted by the applicable NDS factors for the chosen method to give allowable (ASD) or design (LRFD) values. Fire resistance is determined by calculation per NDS Chapter 16, and preservative treatment follows AITC 109 and AWPA U1. The timbers are produced from Norway spruce.