What is Camber and Why is It Important? Glenn Traylor In the truss industry, camber refers to the gradual curvature of a chord member either naturally occurring or created to alleviate the natural deflection of a truss structure. That sounds simple enough, but there are key elements about camber that should be considered. Camber in Action All... Read More July 2024 Issue #16300 Page 33
Building Confidence: Understanding the Technology Behind MSR Lumber MSR Lumber Producers Council In our October article, Because Good Ingredients Matter, we focus on the word quality and the many ways that MSR lumber has become synonymous with high quality structural building components. Having laid the groundwork for why MSR has become so important for optimizing truss designs and an... Read More December 2022 Issue #14281 Page 94
Construction Loading MiTek Staff Per BCSI-B4 (Building Component Safety Information): The term “construction loading” is typically used to describe Loads from workers and Building materials on unfinished structure, as, for example, when builders temporarily stack bundles of panel sheathing or gypsum board on... Read More November 2022 Issue #14280 Page 112
Because Good Ingredients Matter MSR Lumber Producers Council Since the 1960s, fabricators have used machine stress rated (MSR) lumber of all species to improve the performance and reliability of their engineered components and structures. Nowadays, you don’t have to look far to find a successful component manufacturer who relies heavily on MSR... Read More October 2022 Issue #14279 Page 90
Hurricane Andrew — a 30-Year-Old Learning Experience Randy Shackelford This August marked the 30th anniversary of the Florida landfall of Hurricane Andrew, one of the most damaging, and influential, hurricanes ever to hit the United States. Hurricane Andrew hit South Florida with Category 5 winds early on the morning of August 24, 1992. Andrew caused damages of $25... Read More October 2022 Issue #14279 Page 122
Checking Trusses at Bearing Locations for Out-of-Plane Buckling David Rothweiler and Bruce Feldmann Every truss design is evaluated for numerous criteria to determine if it is structurally sound. One of those checks is the capacity of the truss to resist buckling at a bearing location. This article focuses on checking out-of-plane buckling when a truss member is loaded in compression... Read More June 2022 Issue #14275 Page 72
Recommendations and Limitations for Depth and Deflection of Parallel Chord Trusses MiTek Staff In addition to allowable lumber stress limitations, parallel chord truss designs are also regulated by maximum permissible deflection-to-span and depth-to-span limitations. All of the following recommended limitations should be achieved to provide a quality roof / floor system and assure... Read More February 2022 Issue #14271 Page 105
Important Check Points for a Truss Design Drawing Yoonhwak Kim A Truss Design Drawing (TDD) includes specific information[1] for structural engineers and building designers: truss profile, plates, loadings, wind speed, codes, enclosure, exposure, reactions, deflections, materials, bracing, bearings, etc. The maximum reactions are the most important values... Read More January 2022 Issue #14270 Page 102
All Things Wood: Machine Graded Lumber: Technologies, Quality, and Benefits Linda Brown For more than 70 years, people have been using machines to assist in the grading of lumber. This article summarizes the machine grading methodologies for producing Machine Stress Rated Lumber (MSR) and Machine Evaluated Lumber (MEL) and highlights the similarities and differences between MSR and... Read More June 2021 Issue #13263 Page 80
Compression or Tension Web Configuration—Which is Better? Glenn Traylor On a recent Quality Assurance Audit at a large facility, we witnessed a floor truss builder carefully spacing out his floor truss webs in the allotted space available with precision and care. He was very meticulous. I asked him why he was doing that and he explained that his in-house inspector... Read More July 2019 Issue #11240 Page 32