Introduction
Glulam (glued-laminated timber) is a popular choice in modern construction due to its strength, versatility, and aesthetic appeal. One critical aspect of glulam construction is the connection of columns to their bases. Proper column base connections ensure structural stability and longevity. These bases, often referred to as "steel shoes," provide the necessary support and transfer loads to the foundation or supporting structure. In this article, we explore both 'off the shelf' and bespoke options for glulam column bases and discuss their installation methods.
Off The Shelf Options
For many projects, utilising 'off the shelf' column bases can be both convenient and cost-effective. Renowned manufacturers such as Simpson Strong-tie and Rothoblaas offer a range of steel shoes designed to meet diverse structural requirements.
Simpson Strong-tie PBH
The Simpson PBH is a heavy-duty elevated post base designed to provide robust support for glulam columns. This model elevates the column, protecting it from moisture and potential decay.
Advantages:
Heavy-duty support
Moisture protection
Easy to install
Simpson Strong-tie CPT
The Simpson CPT is a concealed post base, offering a more discrete appearance while maintaining strong structural integrity.
Advantages:
Concealed design
Strong and secure
Aesthetic appeal
Rothoblaas Column Bases
Rothoblaas offers a variety of pillar bases designed for different connection forces. Their products are known for their robust engineering and versatility.
Advantages:
Range of options for diverse needs
High-quality engineering
Versatile applications
Fabricated Options
When 'off the shelf' options do not meet specific project requirements, bespoke connections provide tailored solutions. Custom base shoes can be fabricated to the exact specifications needed for the job.
Fabricated (Bolted) Connections
A common and cost-effective bespoke method involves bolting a fin plate through the timber. This method offers strong connections and is relatively straightforward to implement.
Advantages:
Cost-effective
Strong and secure
Customisable
For a more discrete appearance, bolts can be recessed and plugged. This adds an additional cost and may require a wider column to accommodate the hidden fixings, but it significantly enhances the aesthetic of the structure.
Advantages:
Flexible in design
Easy to installÂ
Flexible aesthetics
Fabricated (Resin Fixed) Connections
For projects where aesthetics are paramount and visible fixings are undesirable, resin-fixed base shoes provide an elegant solution. These bases are fixed to the underside of posts using a high-strength resin, effectively hiding any fixings.
Advantages:
No visible fixings
Elegant appearance
Strong and secure
Conclusion
Selecting the right column base connection for glulam structures is crucial for achieving both structural integrity and aesthetic goals. 'Off the shelf' options from Simpson Strong-Tie and Rothoblaas offer reliable, convenient solutions suitable for many applications. However, when more specific or discrete connections are required, custom fabricated bases—whether bolted or resin-fixed—provide the necessary flexibility and visual appeal. By understanding the options available, designers and builders can make informed choices to ensure their glulam structures are both beautiful and robust.
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