In situations where the chevron brace diagonal members attach to the structure above, the layout and coordination of mechanical ductwork and utility piping above the doorways and corridors must account for the depth of the gusset plate connection. The members can be either welded or bolted together, depending on processes at the steel fabrication shop or aesthetic considerations. Gusset plates (similar to the cross-brace elements shown in Figure 6) typically connect chevron brace elements to associated beams and columns. Figure 8 shows a typical multi-floor building elevation using chevron bracing. The solid lines indicate the floor beams and girders. Chevron BracingĬhevron bracing is a modified brace-frame form that generally allows for doorways or corridors in the center of the bays.įigure 7 shows a typical floor framing plan with the bays using chevron bracing, as denoted by the dashed-line drawn from between the two center columns.
When the load comes from the opposite direction, the other leg will become active in its place. When a tension-only cross-braced system experiences a horizontal force from wind or a seismic event, only one leg of the cross-brace will provide resistance. To avoid costly field revisions during construction, it's important that the structural engineer provide the architect with information about the approximate size of the gussets in the planning phase.Ĭross-braced bays make the most of steel's strength in tension to efficiently use small structural shapes.
These plates can take up space that may otherwise be required for mechanical and plumbing systems as well as architectural soffit details. When a building exceeds two or three stories, the diagonal members may support substantial loads that require large gusset plates to placed directly next to the column and beams. Figure 6 illustrates a typical beam-to-column joint for a cross-braced frame. Gusset plate connections are used to join the steel members because all of them can't physically intersect at the work point. As with all braced-frame configurations, it's important to establish the location of these bays quite early in a project's development.Įach intersection will have a common "work point" at which the centerlines of a column, beams, and diagonal members intersect. While Figure 5 shows only one bay of bracing, the height and size of the specific structure may call for bracing multiple bays along a given column line. The solid lines indicate the floor beams and girders.įigure 5 depicts a typical multi-floor building elevation with cross-braced bays beginning at the foundation level. Figure 4 shows a typical floor framing plan with cross bracing denoted by the dashed-line drawn between two center columns. The cross-brace frame, represented in Figures 4 and 5, is perhaps the most commonly used system.
NIRWENS MERCY BRACED FRAME VS PERFECT BALANCE WINDOWS
The location of doors and/or windows on the braced frame frequently determine the bracing configuration for the structure.Įccentric bracing can help dissipate seismic forces through the beam or girder and therefore is commonly used in areas with a lot of seismic activity.īraced frames are generally more cost-effective than other lateral systems. The chevron and inverted chevron braces can be stacked to create a striking two-part cross-brace like those seen on 875 N. There are several variations on the braced-frame model, using cross-brace, chevron brace, inverted chevron brace, and eccentric brace systems. There are three common types of lateral resisting systems: braced frames, rigid frames, and shear walls. One project may use multiple types of lateral systems because each system has its own strengths, limitations, and potential architectural implications. You'll work closely with the structural engineer to balance the lateral resistance requirements of the structure with your architectural vision. You should start thinking about the lateral load-resisting system(s) in your project early in the planning phase.You'll also want to bring in your team's structural engineer early to can determine which type of system will work best for your specific building height and configuration and specify where the system should be located.
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