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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Roof having two slopes on each side of the peak, the lower slope usually steeper than the upper one see Figure B, page Columns laminated columns or posts are embedded in the ground or attached to a foundation using the method specified by the Building Designer. Serviceability failures often occur if hcsi Gable End Frame is not properly braced.
This typically includes directly applied Structural Sheathing or Purlins at a specified maximum o. Lumber of any thickness and width that is graded for its mechanical properties. Stack heights assume short-term duration of Load. Permanently attach the Girder Truss to bearing supports. Please always consult a Registered Design Bcs. Set first Truss into position and connect it to each bearing and then to the Ground Brace verticals where they intersect the Top and Bottom Chords of the Truss.
The two-dimensional area formed by the top or bottom edge of adjacent similar Bottom Chords allowing for the Connection of ceiling Diaphragm, or Bracing members in a linear fashion. Nail driven at an angle to the member. Also referred to as a band board. Maximum lengthweb is 14′. Proprietary metal reinforcement products and stacked web products are also viable alternatives. Ground Bracing can be installed on either the exterior or interior of the Building, to the top of an adjacent wall, or to the structure itself.
Is the roof a hip style? Some chord and web members not shown for clarity. Walking on Trusses that are lying flat is extremely dangerous and shall be strictly prohibited.
Truss spacers are not intended as structural members and are insufficient as Lateral Restraint and Bracing of any kind. A falling worker attached to an inadequately braced set of Trusses could cause all the previously set Trusses to collapse in a domino effect.
Install Diagonal Bracing to the Top Chord plane immediately after the intial five Trusses have been set and restrained.
Trusses have flat Bottom Chords and are spaced 4′ to 12′ on-center o. Prior to component installation, the documents should be examined and disseminated to all appropriate personnel, in addition to proper training and a clear understanding of the installation plan, any applicable fall protection requirements, and the intended restraint and bracing requirements. If the Truss is already installed, shore up the Truss to relieve any Load.
Properly attaching the Girder Trusses and jack Trusses at their bearing points and permanently restraining and Diagonally Bracing this assembly will provide a rigid framework to which subsequent Trusses can be restrained and braced. Truss spacers are for spacing only!
Length of Penetration The withdrawal and lateral resistance provided by a nail depends, in part, on the length of penetration into the wood member. The Connection at the top is important during Truss installation as it helps to stabilize the Top Chord of the Girder Truss.
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 b as required to minimize Lateral Bending and to lessen moisture gain from the ground See Figure B, page 4.
The Loads from workers and building materials on an unfinished structure, for example, when builders stack bundles of panel sheathing or gypsum board on Trusses during the construction process.
Exercise caution to assure the Trusses are accurately located at their proper on-center spacing, while the Lateral Restraint is being applied. The design loads and other information pertinent to the structural design required by Sections Permanente para la Cuerda Superior un Ensamblaje de vea abajo.
Truss spacing of Likewise, after this first set of Trusses is adequately Diagonally Braced, the remaining Trusses installed rely on this first set for stability. See Figures B, 31, 32 and Leaning or bowing Trusses can result in nails that miss the Top Chords when Structural Sheathing is applied, and create excessive cumulative stresses on the Bracing, which can lead to Bracing failure and Truss dominoing.
Locations for lateral restraint shall be identified on the Truss design drawing.
They are typically used in repairs. Two pieces of Stress-Graded Lumber attached to a Web as reinforcement against buckling instability. If the Truss Bottom Chord and wall plate are different species, use the species with the lowest specific gravity to determine the lateral Load capacity of the fasteners. Some installers lift the first five Trusses one at a time and restrain, brace and sheath as they go.
Trusses are intended to carry Loads applied parallel to their plane i. The dimensions shown are only meant to serve as an approximate guide. The act of mechanically or manually hoisting. Truss position or alignment within a structure relative to bearing walls. Minimum Nail Size 10d 0. The installer should provide adequate Connections between the Ground Bracing system and the first braced Truss to resist the cumulative brace force P as determined in Section 4 and Appendix A of DSB Refuerzo de Miembros Secundarios Individuales T- L- Scab, I- U-Reinforcement, proprietary metal reinforcement and stacked web products provide an alternative for resisting web buckling.