Last Updated: 22. Januar 2023
Design Software for Structural Engineers

Design Glulam Beams and Columns to Eurocode 5

Design glulam beams, columns, fire performance and connections in Europe to Eurocode 5, drawing on real product data from suppliers including Rothoblaas, Eurotec, SPAX and Pitzl so your grade and section choices match what's actually available to specify. Bending, shear, buckling and deflection are checked automatically, including penetration and reinforcement design. Try the calculators to specify your next glulam element with confidence.

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  • Standard: EN 1995-1-1:2004 (Eurocode 5), EN 14080 for grades
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About Glulam · Eurocode 5

The Design of Glulam for European Projects

Glue Laminated Timber (Glulam) allows for spans and geometries that solid timber simply cannot match. By laminating stress-graded timber stock, Glulam offers higher strength, consistency, and architectural beauty. The SPEC Toolbox Glulam Calculators remove the complexity of Eurocode 5 (EN 1995-1-1) verification. Whether you are designing a simple roof ridge beam or a heavy-duty column, this tool automates the interaction checks, stability factors, and material properties for all standard European Glulam grades (EN 14080).

The engineer's guide

Glulam · Eurocode 5

What This Calculator Does

  • Bending Capacity (My,Rd, Mz,Rd): Checks major and minor axis moment capacity, automatically applying the size effect factor (kh).
  • Shear Capacity (VRd): Verifies vertical shear strength, critical for short, heavily loaded beams.
  • Lateral Torsional Buckling (kcrit): A rigorous stability check for long, unrestrained beams — calculates the critical bending stress (σm,crit) to prevent the beam from rolling over before it reaches its full strength.
  • Compression & Buckling (kc): For columns, calculates the slenderness ratio (λ) and applies the instability factor (kc) for buckling about both axes.
  • Deflection (wfin): Calculates instantaneous and creep deflection (kdef) to ensure long-term serviceability.

Design of Glulam Beams

Supplier & Code Integration — integrates supplier-specific glulam data with Eurocode 5 requirements. Material grades (GL24h, GL28h, etc.) evaluated using Eurocode 5 design parameters; national annex settings ensure country-specific safety factors and load combinations.

Analytical Model: Elastic Beam Theory (Euler–Bernoulli, linear elastic, plane sections remain plane); Section Properties (moment of inertia, section modulus, effective area, radius of gyration); Stability Considerations (effective length parameters for lateral-torsional instability).

Structural Performance Checks: Bending Resistance; Shear Resistance; Torsional Stability Check Due to Bending (lateral-torsional buckling, critical bending stress and reduction factors); Deflection Verification (instantaneous, creep, final deflection vs. allowable span limits).

Design of Glulam Columns

Same supplier/code integration approach; national annex settings for country-specific factors.

Analytical Model: Elastic Member Analysis (axial compression, bending from eccentric loads, Eurocode 5 procedures); Section Properties; Load Eccentricity Effects (both principal directions).

Structural Performance Checks: Bending Verification (both axes); Compression Verification; Combined Actions Verification (Eurocode interaction equations); Buckling Verification (effective length, slenderness, reduction factors); Lateral Torsional Stability.

Design of Glulam Members

Supplier Integration & Material Data — GL24h, GL28h etc. evaluated per Eurocode 5 material parameters.

Analytical Model: Design Action Effects (forces entered directly by user rather than derived from loads/spans — bending moments, shear, axial entered as design action effects); Section Properties; Member Configuration (columns or diagonal braces, length, analysis location, loading duration).

Structural Performance Checks: Bending Verification (Mx, My); Combined Bending Check; Compression Verification; Combined Bending and Compression; Shear Verification (Fx, Fy); Combined Actions Check; Stability Verification.

Design of Glulam Fire

Advanced GLT Fire Engineering — implements Eurocode 5 fire design provisions and national annex methodologies; calculates char depth development and reduced effective cross-section.

Precision Charring and Residual Section Analysis — users define basic charring rate (β₀) and notional charring rate (βₙ) with required fire resistance time; accounts for different exposed faces and protection conditions (partial exposure, protected faces, multi-sided fire attack).

Automated Fire Verification — Fire Bending Resistance, Fire Shear Resistance, Torsional Stability Under Fire Conditions.

Design of Glulam Connections

Advancing Structural Connection Design — Advanced Yield Modeling (Eurocode Johansen Yield Models); ETA Integration (supplier-specific European Technical Assessments).

Simplified Structural Joint Design — preconfigured types: Dowel and Bolt Connections, Beam-to-Column Connections, Beam-to-Beam Connections, Compression Perpendicular to Grain (GLT), Beam Notch Verification, Shear Reinforcement Design, CLT Floor-to-Beam Interfaces.

„Global-Local“ Connection Library — Universal Fastener Selection: ESSVE, Eurotec, Klimas, Rocket/Vynex, Rothoblaas, Schmid Schrauben, Sihga, SPAX, Würth, Pitzl. Verified Compatibility: Binderholz, Kalvasta Timber, MTT, Theurl.

Design of Glulam Penetrations

Evaluates circular and rectangular penetrations for size, location, and interaction with beam stress distribution.

Detailed Penetration Geometry — type, dimensions, position along beam; circular or rectangular openings; size and spacing; location within cross-section; reinforced or unreinforced. Auto-evaluates geometric limitations and spacing requirements.

Reinforcement and Structural Capacity Verification — self-tapping screws as reinforcement elements. Automated checks: Geometric Limitations for Penetrations, Tension Verification for Unreinforced Openings, Flexural Resistance of the Modified Section, Shear Resistance Near Penetrations, Reinforcement Geometry Requirements, Reinforcement Design Capacity.

Frequently asked questions

Glulam · Eurocode 5

Can I design tapered beams?
This module is for Prismatic (Straight) members. For tapered, curved, or pitched-cambered beams, please use our advanced Complex Beam Module (coming soon), as these require specialized stress checks for tension perpendicular to grain (kvol).
Does it check bearing?
Yes. The calculator verifies the Compression Perpendicular to Grain (fc,90,d) at the supports. You can adjust the bearing length (lb) to ensure the beam doesn't crush the wall plate.
Is Fire Design included?
This module covers "Cold" design. For fire verification (R30, R60), use the Beam Fire Calculator to determine the effective reduced cross-section (deff) after charring.

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