PPT-Analysing Forces in Trusses

Year 12 Engineering Studies Civil Structures A truss is a structural frame used in engineering A truss consists of straight bars known as members that are connected at each end using. These guidelines should not be considered to be the only method for erecting and bracing of a roof system TPIC disclaims any responsibility fo r damages arising from the use application or reliance on these guidelines 1 Check Trusses while they are G322 Exam – Section A. Analysing Representation. Gender . Age . Ethnicity . Class and status. Sexuality. Physical . ability/disability . Regional . identity . Analysing CLASS & STATUS. INTERNATBuilding INTERNATBuildingWood trusses are engineered frames of lumber joined by galvanized steel connector plates, referred to commonly wood floor trusses are being used in residential and com Analysing Structures ref: 12712.035 - BA Page 1 ( 14 ) www.tacso.org This material ha s been developed by MDF Analysing Structures 1. Introduction When explaining about their organisation the first 2 Common Types of Trusses gusset plate G322 Exam – Section A. Analysing Representation. Gender . Age . Ethnicity . Sexuality . Class . and status . Physical . ability/disability . Regional . identity . Analysing ETHNICITY. Objectives. To introduce a truss-structure system. To define truss. To demonstrate the types of trusses . 6 - . 3. Introduction. For the equilibrium of structures . which are . made . up . of several connected parts, the . Review. A . truss is considered to be a solid beam full of holes. A truss and beam behave similarly under the same live load.. The point of a truss is to disperse forces as far from the neutral axis as possible in order to resist deflection.. Folks, I just received a rather disturbing series of pictures of new construction currently going on in New Jersey.    Apparently these new-style wood trusses are commercially available and no longer use the metal "gusset plates" that we are all familiar with. This new breed of firefighter-killers is simply 2x4 Finger Jointed lumber (yeah, it's not even dimensional lumber) held together by little spots of glue where the webs meet the chords. Check out the attached pics... You also can see that these particular trusses are installed in townhouse-style occupied multiple dwellings. All that's holding them up is a 2x8 or TJI sill plate that's anchor bolted to the block sidewall.    I'm not an engineer, but it looks like it's actually the dead load and   live load from above that holds the house of cards together. My dad is a commercial sales manager at a large lumberyard. He is going to further investigate the manufacture and engineering of this product and I'll keep you advised of anything important to our operational safety.   If a standard gusset-plated truss will fail in less than five minutes of fire exposure, how long will these toothpicks stand up? How about the added weight of 2 or 3 firefighters with equipment trying to make a vent hole and removing some of the engineered dead load providing the stability to the system?  Just food for thought. This stuff's out there... It's just a matter of   time 'til it pops up around here. Many nationally recognized instructors are now recommending popping a decent-sized inspection hole in the ceiling immediately inside the point of entry and on each floor of any building with smoke or fire . Roof Trusses. Trusses . are . triangular frame. works, consisting of . axially . loaded members . They . are . more efficient in resisting external loads. . as the . cross . section of . all the members . In-Class Activities. :. Check Homework, if any. Reading Quiz. Applications. . Simple Trusses. . Method of Joints. . Zero-Force Members. Concept Quiz. Group Problem Solving. Attention Quiz. Today’s Objectives. Aug 2010. Dec 2010. Aug 2011. Dec 2011. Aug 2013. Dec 2013. Dec 2014 KL. Answer Guideline. Categories of buildings. Large span, low rise buildings. Multi-storey structures . Can you think of examples of buildings with long span roof construction?. To introduce a truss-structure system. To define truss. To demonstrate the types of trusses . 6 - . 3. Introduction. For the equilibrium of structures . which are . made . up . of several connected parts, the . Truss. 2. Definition of a Truss. A truss is an assembly of straight members connected at joints. . No member is continuous through a joint.. Bolted or welded connections are assumed to be pinned together.