With the recent introduction of our new LSSR rafter hangers for 2x lumber, we thought we’d provide some background on how these new hangers were developed and why.
Resiliency is a term which is becoming more commonplace within the field of structural engineering, not just in North America but worldwide. As part of a nation that prides itself on being progressive, engineers in seismic zones of Canada are already exploring innovative solutions that may help create economic structures with resiliency in mind. But what do we mean by resiliency?
In the fields of engineering and construction, resiliency is the ability of a structure to absorb or avoid damage without suffering complete failure. Structural resiliency is the ability of a building or structure to remain sufficiently sound and intact following a shock event as to allow rapid resumption of normal use.
We’ve been receiving a lot of requests lately from engineers wanting to know exactly what the difference is between Simpson Strong-Tie’s relatively new adhesive, SET-3G™, and its predecessor, SET-XP®. Both are epoxy-based adhesives used to anchor threaded rods and reinforcing bars in concrete base material for structural applications. If you perform a live pull test on a ½“-diameter mild steel rod embedded 4“ deep in 3,000 psi uncracked normal-weight concrete, the result will likely be the same; in both cases, the steel rod will break in a ductile manner at around 11 kips. You can see this hourglass-shaped steel failure mode happening in Figure 1. (To learn more about anchorage failure modes and ductility, check out this blog). Yet, the SET-3G design values shown in ESR-4057 come out ahead. But why?
Hurricane season is in full swing, and we’ve had a record number of named storms to date. With each one, Mother Nature has taken the opportunity to remind us of her awesome power and teach us how we can improve our built environment in preparation for the next. One of the lessons we’re regularly reminded of is the importance of a successfully implemented continuous load path and its role in keeping a structure intact.
It would be a lot simpler for designing engineers if structural connections were always for members at right angles to one another. Often, connections have to be designed for supported members that are at a skewed or sloped angle rather than perpendicular to the header. In these cases, the engineer will have to choose between a premanufactured adjustable hanger and a custom hanger. Simpson Strong-Tie offers both options, and in the following post, Randy Shackelford, P.E., discusses the various considerations that may affect a specifier’s choice.
It makes things easy for an engineer when the building being designed is rectangular. This allows you to make the connections between nice perpendicular members, and standard connectors and joist hangers are easy to specify.
Our “Quik” line of tools now has jobsite efficiency covered from subfloor to drywall to rafters. The Quik Stik overhead assembly fastening system is our most recent innovation in a line of fastening systems that also includes the Quik Drive® PRO250G3 subfloor system and the Quik Drive PRODW drywall system. It provides contractors with a versatile solution that makes fastening rafter and truss connections faster and easier than ever. Here are five ways the Quik Stik raises the bar on overhead fastening.
Lag screws are traditionally specified for many structural loads in wood construction. However, recent innovations in engineering for self-tapping wood screws have made them an increasingly popular, labor-saving alternative to lag screws. In the following post, Aram Khachadourian, P.E., of Simpson Strong-Tie discusses the structural and economic advantages of this option.
Although truss-designed roofs are predominant throughout most of the residential construction industry, there are regions where building with stick-frame roofs is still common. In this post, Randy Shackelford discusses some design choices available to stick-frame builders, the challenges they pose, and the solutions offered by the Simpson Strong-Tie® connector system for stick-frame roofing. The post will also discuss some changes in the 2021 IRC that affect construction of stick-frame roofs.
Of course you know about creating a continuous load path with either connectors or rod tiedown systems, but have you considered using fasteners instead? In this post, Bryan Wert follows up on our May 2 webinar, Drive a New Path: Resisting Uplift with Structural Fasteners, by answering some of the interesting questions raised by the attendees.
On May 2, Simpson Strong-Tie hosted an interactive webinar where we discussed different methods of creating a continuous load path for wind uplift resistance. Most of the hour-long webinar was devoted to the innovative structural screw system comprising our Strong-Drive® SDWC Truss screw and the SDWF Floor-to-Floor screw with TUW take-up washer. In addition to sharing load capacities, installation details and various benefits of this system, we included a design example with illustrative specification options. In case you weren’t able to join our discussion, you can watch the on-demand webinar and earn PDH and CEU credits here.
Nothing will ruin your day faster than getting a call from a builder reporting an issue with trusses you’ve designed. You hear their frustration as they are faced with a potential delay and additional work to implement a fix. We all desire to eliminate those calls from our daily business, and one way to do so is to work only on jobs with a perfect set of drawings. You know, the drawings with dimensions that are 100% correct, have no errors in the listed wall heights, the heel heights are clearly spelled out with the location of the HVAC equipment and lines identified, and every load path is well thought out.
The truth, though, is that there’s really no such thing as a perfect set of drawings, because there will always be some area needing further clarification to ensure the trusses you design won’t have issues. Although this reality is typically viewed as a source of frustration, it can be an opportunity to provide extra value to your customers by helping them resolve issues before they become a problem in the field. To do this requires a trained eye to identify issues and the use of an RFI (Request for Information) to work through these issues with the appropriate parties involved. In this article, we will walk through some best practices of using an RFI to help eliminate those calls.