- Page 42 of 51 - News, Notes and Discussion from the Simpson Strong-Tie Engineering Department

Structural Engineering, Shamu, and Calzones

I attended the SEAOC Convention in Santa Fe last year, and briefly mentioned it in this blog post. It was the first convention I had attended. I knew the presentations would be top notch based on the topics and knowing many of the speakers, but I had no idea how much Ashraf Habibullah and the other folks at Computers and Structures loved to party! The event they hosted at the Gerald Peters Gallery was beyond anything I expected – amazing food, art, dancing, open bar and even iPad giveaways.I was looking forward to attending the SEAOC Convention in San Diego this year, until I realized I would be in Quebec for ASTM D07 committee meetings that week.

So this week’s post summarizing the SEAOC Convention comes from Tim Stauffer, an R&D Engineer at our headquarters. Since joining Simpson Strong-Tie in 2008, Tim has worked on lateral system products, product development for our wood connectors, and development of products for the cold-formed steel industry where he was lead engineer for development of our line of connectors for curtain-wall construction. Prior to joining Simpson Strong-Tie, Tim worked for 15 years as a consulting structural engineer, including eight years where he ran his own practice. His experience includes the design, analysis and investigation of steel, concrete, masonry, and wood-frame buildings. Tim is a licensed professional engineer and structural engineer in the state of California. He received his bachelor’s degree in Architectural Engineering from Pennsylvania State University, and a Master’s of Science in Civil Engineering from UC Berkeley.

What do structural engineering, reconnecting with old friends, Shamu the whale, and a restaurant that serves the biggest calzone around have in common? The 2013 SEAOC Convention, of course! Held September 18-21 in San Diego, the annual convention is a great opportunity to learn about advances in the structural engineering profession, as well as spend time networking and re-connecting. Simpson Strong-Tie has always been a SEAOC supporter, and this year was no exception with a number of us from headquarters attending, as well as engineers and sales folks from our two California branches.

The two-and-a-half days of technical sessions included presentations on sustainability and design for solar installations; advancements in design for wood, concrete, and steel; wind, seismic, and blast analysis and design; tall structures and base isolation; and presentations on a variety of unique design projects. Of particular interest to many of us at Simpson Strong-Tie were presentations on high-rise wood structures, the growing use of cross laminated timber (CLT), the NEES-Soft testing performed at UCSD (including tests of buildings strengthened with our new Strong Frame® special moment frame), and advancements in steel moment frame design. Go here to view the convention program, including a complete list of the technical presentations.

Attendees listen to one of the many presentations offered at the SEAOC Convention Image credit: Computers & Structures, Inc. — A presentation at the SEAOC Convention. Photo courtesy of Computers & Structures, Inc.

In addition to the top-notch technical sessions, there was plenty of opportunity to reconnect with colleagues and build new relationships. Many of us worked for consulting firms before coming to Simpson Strong-Tie, and the convention was a great opportunity to catch up with former co-workers. The ability to maintain connections with designers is invaluable for us as we develop products to solve real-world challenges to help people build safer, stronger structures. For more about the value of networking and how to get involved with industry organizations, see Annie Kao’s recent blog post.

Wendy Allen, a Field Engineer from our Northwest region and a SEAONC board member, makes some new friends Image credit: Brad Erickson, Simpson Strong-Tie — Simpson Strong-Tie Field Engineer Northwest Region and SEAONC Board Member Wendy Allen, PE, makes some new friends. Image credit: Brad Erickson, Simpson Strong-Tie.

Why Your NDS Nail Calcs Could Be Wrong. . .And What You Can Do About It

This week’s post was written by Bob Leichti, Manager of Engineering for Fastening Systems. Prior to joining Simpson Strong-Tie in 2012, Bob was an Engineering Manager covering structural fasteners, hand tools, regulatory compliance and code reports for a major manufacturer of power tools and equipment. Prior to that, Bob was a Professor in the Department of Wood Science and Engineering at Oregon State University. He received his B.S. and M.S. from the University of Illinois, and his M.S. and Ph.D. from Auburn University.

When test results don’t make sense, we start by eliminating causes of the problem. When our withdrawal test values came up low, we checked the load cell calibration, the specific gravity of the wood, the nail dimensions, even the units – everything was correct. So why were the nail withdrawal values so low? More wood, more nails, more tests – same results. Ultimately, we concluded that the withdrawal resistance of stainless-steel, smooth-shank nails is not well described by the withdrawal function in the 2012 NDS, section 11.2.3, equation 11.2-3.Continue Reading

City of San Francisco Implements Soft-Story Retrofit Ordinance

The city of San Francisco is a unique construction environment that is 98% built-out with little new residential construction. Protecting the existing structures is particularly imperative to save the character of the city and maintain the population base by preventing a major migration out of the city after a large seismic event.

The Community Action Plan for Seismic Safety (CAPSS) was a San Francisco Department of Building Inspection 10-year-long study started in 1998 to study earthquake risks in San Francisco and develop suggestions for mitigating loss of life and property damage from future earthquakes. I once worked as a volunteer on a sidewalk survey to inventory soft-story buildings as part of CAPSS. The key recommendations of CAPSS evolved into the CAPSS Earthquake Safety Implementation Program (ESIP), which has 50 tasks that will be implemented over the next 30 years.

One of those tasks includes the Mandatory Soft-Story Retrofit Program, which Mayor Ed Lee signed into law on April 18, 2013 at the annual commemoration of the 1906 San Francisco Earthquake. The law requires wood-framed buildings that:

Were built prior to 1978
Are three stories or more and,
Have five or more dwelling units

to be evaluated and brought into compliance. The city sent notices to building owners on September 15. It’s estimated that there are between 4,000 and 10,000 structures that fall under the program.

23rd Short Course on CFS Structures: October 15-17 in St. Louis

Simpson Strong-Tie is sponsoring the 23^rd Short Course on Cold-Formed Steel Structures hosted by the Wei-Wen Yu Center for Cold-Formed Steel Structures (CCFSS). The course will be held on October 15-17, 2013 at the Drury Plaza Hotel at the Arch in St. Louis, MO.

This course is for engineers who have limited or no experience designing with cold-formed steel (CFS), as well as those with experience who would like to expand their knowledge. Lectures will be given by industry-recognized experts Roger LaBoube, Ph.D, P.E., and Sutton Stephens, Ph.D, P.E., S.E. The course is based on the 2007 and 2012 AISI North American Specification for the Design of Cold-Formed Steel Structural Members with the 2010 Supplement (AISI S100-07/S2-10 and S100-12) and will reference the Cold-Formed Steel Design (4^th Edition) text.

Topics include design of wall studs, floor joists, purlins, girts, decks and panels. For more information and to register, visit the CCFSS website.

– Jeff

Getting Involved and Staying Connected in the Industry

I’m excited to share some tips on getting more involved with the structural engineering community. There are many organizations and industry associations related to structural engineering that it can feel daunting to try to meet all of the key players and make a name for yourself.

I have a really unique and fun job at Simpson Strong-Tie as a field engineer for our light-frame construction products, which include connectors, fasteners, and lateral systems. As a field engineer, I spend most of my time out on the road visiting engineers, architects, building officials, contractors, and others who need technical assistance using our product lines. While this means I spend a good chunk of time in SoCal traffic, I do get to talk to lots of different people working on projects ranging from small home remodels that might be using our new Strong-Frame® special moment frame to huge multi-family housing projects with several thousand units.

I also make sure to attend as many industry association functions as I can, because these are the best places to network and meet other professionals. There are many great organizations, including the Structural Engineers Association, which has chapters all over the United States. The California chapters have very strong participation. I also suggest getting involved in other industry organizations that include people outside of the profession, such as building officials, inspectors, contractors, builders, and architects. These people play an integral part in the construction industry and it’s important to understand their role and importance in supporting structural engineering.

Upcoming Steel Deck Institute Webinars: 10/23 and 11/13

Steel Deck Institute (SDI) is hosting a “Designing With Steel Roof Deck” webinar on October 23 and November 13 at 11 a.m. EST. The webinar is intended to expand participants’ knowledge of steel roof deck by introducing them to the benefits, manufacturing processes, shapes, properties, and finishes of this product. The basis of the presentation is SDI’s new Roof Deck Design Manual, which will be provided to participants. Various roof deck design considerations will be explored as well as an overall coverage of fasteners and industry construction practices.

CANAM/United Steel Deck and Vulcraft will be presenting. Simpson Strong-Tie will be moderating the webinar and providing two PDHs (0.2 CEUs) for participants. Click here to sign up for one of the webinars.

Not Just A Connector Company

I write a lot about testing on this blog, from my first post about testing to the series I did on how we test different products (hangers, holdowns, fasteners). This week I’d like to highlight some unique testing we’ve been doing to support one of our new product lines. Simpson Strong-Tie® recently introduced our Repair, Protection and Strengthening Systems for Concrete and Masonry. The new product line is the result of our acquisition of Fox Industries, Inc. in 2011.

In the past, I’ve shared some of the more fun tests we’ve run, like the bowling ball test or 40 kip hangers. This week we’ll take a sneak peek at testing of the FX-70® Structural Repair and Protection System. FX-70 uses high-strength fiberglass jackets and high-strength water-insensitive grouting materials to repair and protect wood, steel, and concrete structural members. The system is primarily used on piles in marine environments.

Fx-70 installation on wood piles. Image credit: Simpson Strong-Tie.

Mixing It Up with Concrete Specification

Around Christmas, the Engineering Department does a white elephant gift exchange. We have no idea who framed this picture and wrapped it up the first time.

Several of our lab technicians (plus a product manager) are posing for the camera, and obviously trying to flex while sucking their bellies in during a concrete pour to test our SSTB(R) anchors. The tradition has it that if you end up with this picture, you hang it on your wall and re-gift it at next year’s gift exchange – so there it is, on the wall in Engineer Dustin’s office. The trick has become wrapping it so that nobody recognizes that it is the picture frame.

Speaking of concrete, between our test labs in Addison, Ill., Stockton and Pleasanton, Calif., we test a lot of concrete. We will certainly be doing a lot more testing to continue to support our new Repair, Protection and Strengthening Systems for Concrete and Masonry product line. But I will ask the lab technicians to keep their shirts on.

TED Talk – Michael Green: Why We Should Build Wooden Skyscrapers

I have been following TED Talks for a few years now. Like most websites I have on my “to visit” list, I couldn’t tell you how I found them. It may have been a link on some other website, or a friend on Facebook, or maybe linked on another blog somewhere. What is TED? I’ll steal from their website:

TED is a nonprofit devoted to Ideas Worth Spreading. It started out in 1984 as a conference bringing together people from three worlds: Technology, Entertainment, Design. Since then its scope has become ever broader. Along with two annual conferences — the TED Conference and TEDGlobal — TED includes the award-winning TED Talks video site, the Open Translation Project and TED Conversations, the inspiring TED Fellows and TEDx programs, and the annual TED Prize.

New content is posted on TED every day, so I often miss cool stuff. Thanks to one of our Canadian engineers for pointing out a talk by architect Michael Green, who makes a case for why we should build wooden skyscrapers. I did a previous post about the Timber Tower Research Project that Skidmore, Owings & Merrill LLP did for a 42-story wood framed building. Mr. Green makes the case for taller wood structures from an environmental standpoint and carbon dioxide output of concrete and steel versus wood.

The 12 minute video is worth a listen. The TED Blog post is here: Why tall wooden buildings must be our future: a visual essay by Michael Green.

– Paul

What are your thoughts? Visit the blog and leave a comment!

What It’s Like To Be An Engineering Intern – By Robert

I worked several summer internships while in college, and as an employer I find them to be mutually beneficial. Companies are able to complete tasks they haven’t had time for, and students gain valuable work experience. I have been lucky to have two very good engineering interns this summer. In the spirit of having interns do my work for me, I thought it appropriate to have Robert write a blog post this week. Robert will be finishing up his degree in Architectural Engineering from Cal Poly San Luis Obispo this winter. Here is what Robert wrote about what it’s like to be an engineering intern:Continue Reading