The BCSI B-Series Summary Sheets summarize each of the chapters of the BCSI book. B3 – Permanent Restraint/Bracing of Chords & Web Members. Refer to the BCSI-B3 Summary Sheet – Permanent Restraint/Bracing of Chords & Web Members for more information. All other permanent bracing design is the. To view any of the BCSI documents click on the links below. BCSI-B1 Summary Sheet. Handling, Installing, & Bracing BCSI-B3 Summary Sheet. Web member .
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If Trusses are to be stored horizontally for more than one week, place blocking of sufficient height beneath the stack of Trusses on 8′ to 10′ intervals or as required to minimize lateral bending and to lessen moisture gain from the ground. This includes wood Truss construction. Special care shall be taken in the choice of rigging equipment to prevent damage to the Trusses. Trusses, as with other types of structural framing components such as joists, beams, studs, etc.
Do not drag or push Trusses along ground. Worker attention is often directed upward, even while moving around. A nail selected to be longer than the member s it is driven through and which is bent back the dimension of bcwi excess length. Begin component installation only after any unsatisfactory conditions have been corrected. The enclosed documents are offered as minimum guidelines only. This group includes Art Hernandez, P. Blocking on either side of Diagonal Brace location, if required.
Are all bearing supports accurately installed at the locations shown on the Construction Documents? Each Summary Sheet condenses the information contained in the corresponding section of this book into a few pages that emphasize the main points using a graphical representation of the bbcsi as fully as possible. B wall columns extend above the mid-height of the Truss heel at the Connection of the column and the Truss.
Stack heights assume shortterm duration of Load. The truss manufacturer and truss designer rely on the presumption that the contractor and crane operator if applicable are professionals with the capability to undertake the work they have agreed to do on any given project.
Provide additional temporary Diagonal Bracing in the plane of the Bottom Chord as indicated in Figure B, on page 79, at intervals not to exceed ‘ or 12 Truss Spaces, whichever is less. Using a flat bottom chord gable end frame with adjacent trusses that have sloped bottom chords is prohibited by some building codes as adequate bracing of this condition is difficult and sometimes impossible. Properly attaching the Girder Truss and jack Trusses at their bearing points and bvsi restraining and Diagonally Bracing this assembly will provide a rigid framework to which subsequent Trusses can be restrained and braced.
This type of reinforcement is typically used as an alternative to the combination of continuous lateral restraint CLR and diagonal bracing when CLR is not possible or desirable.
Construction documents shall be in accordance with Sections CAUTION Addressing fall protection hazards may be obvious, but other hazards must also be considered when choosing the appropriate site-specific fall protection systems.
In wood, a design consideration for modifying allowable stresses, based on the accumulated Loadings anticipated during the life of a structure. It is of- ten more structurally efficient for multiple-ply Webs and provides easier nailing because it is applied to a wide-face of the Web.
The Load from this brace must be considered in the design and attachment of the supporting Truss. The reinforcement information in this table is limited to the reinforcement of Webs in single-ply Trusses in which there is either one or two rows of CLR specified on the TDD. Long Span Trusses are very prone to bending out-ofplane while being lifted into place.
If the hip Girder Truss consists of multiple plies, it is much easier to fasten the plies together and install the end jack hangers if required on the ground before lifting the Girder Truss into place.
This information is typically provided in the Construction Documents. Lifting devices should be connected to the Truss Top Chord with only a closed loop attachment utilizing materials such as slings, chains, cables or nylon straps of sufficient strength to carry the weight of the Truss.
This eliminates the need for Ground Bracing the first Truss, assuming all hardware and hangers are properly installed prior to the crane releasing the Girder Truss.
Truss restraint and bracing not shown for clarity. Top Chord sheathing not shown for clarity.
Trusses with clear spans of 60′ or greater. CLRs shall always be Diagonally Braced for rigidity. Inclined or horizontal member that establishes the top edge of a Truss, usually carrying combined compression and bending stresses. Please always consult a registered design professional. A written plan prepared for the prevention of injuries associated with falls.
Valley Set frames Figure B on page 35 spaced at 24″ o. Assemble the first five Trusses with all Structural Sheathing, restraint and Bracing. A menudo el mismo arriostre puede ser usado para ambos funciones.
Hip Sets are laid out in a variety of ways but, for the most part, they have a hip Girder Truss that is set back from the end wall a certain distance and perpendicular end jacks that span the setback distance. See Figures B, 31, 32 and A Connection between Trusses or Structural Elements and non-load bearing interior walls that allows for seasonal movement. Likewise, after this first set of Trusses is adequately Diagonally Braced, the remaining Trusses installed rely on this first set for stability.
Valley Set frames on top of lower roof. For hip style roofs, use the crane Construction Documents on the jobsite? Jobsite safety has no room for shortcuts.