A simple method is to perform what is called a “strip analysis” of the panel around the opening. This can be done using hand calculations of assumed strips of the panels surrounding the holes idealized as beams. For CLT in particular, keep in mind the major vs. There are different levels of analysis that can be performed to evaluate the structural impacts of openings. Shop-fabricated openings usually provide more accuracy in terms of opening dimensions and location and often a cleaner aesthetic. This helps ensure that the mass timber manufacturer fabricates the panels with the openings (rather than having to make adjustments in the field). That said, for coordination and fabrication, it is beneficial to model as many of the penetrations and holes in mass timber systems as possible. Each condition can be evaluated on a project-by-project basis however, it is possible for a design team to establish some standard structural details and allowances based on known panel properties, stress ratios, loading conditions and other parameters. What holes are acceptable without supplemental framing will depend on the panels used, loading on the project, and size and location of holes relative to the panel layout and span. design guides or standards that directly address how to prescriptively assess what holes and openings are acceptable without reinforcing in CLT floor and roof panels. Structural Impacts of Openings in Mass Timber Floor and Roof Panels Example of holes in CLT floor panel that do not require reinforcing
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