--- url: https://qsteelcad.com/en/blog/light-steel-bracing-systems-guide language: en alternate: https://qsteelcad.com/blog/hafif-celik-capraz-sistemleri updated: 2026-11-06 publisher: RENMAE Teknoloji ve Yazılım LTD. ŞTİ. --- # Bracing systems in light steel: a guide to X, K, V and sheathed panels A light steel building resists lateral load in one of two ways: braced panels or sheathed panels. This guide explains how each system works, how they differ, and what the Turkish rules require. ## Short answer In a light steel building, lateral load is carried by braced panels or sheathed panels. X-strap bracing works in tension only; profile bracing such as K and V carries tension and compression; panels sheathed with OSB, plywood or sheet steel transfer force by shear through the screws. The choice depends on section, connection, anchorage and load path, not on appearance. ## Key points - The Turkish Building Earthquake Code 2018 (TBDY 2018) defines two lateral systems for light steel: sheathed panels and braced panels. - Braced panels count as Limited Ductility Level; panels sheathed with OSB or plywood count as High Ductility Level. - A strap works in tension only, a profile brace in tension and compression; the same X shape means a different calculation. - In mixed use, the panel type with the lower ductility governs the system ductility. - The 2027 light steel regulation requires a brace to be one continuous member between the top and bottom track. Bracing stops a light steel wall panel from racking into a parallelogram under lateral force. Studs carry vertical load, but the screwed joints between studs and tracks do not form a rigid frame against lateral load on their own. For a panel to bring wind and earthquake force down to the foundation, it needs either a bracing member or structural sheathing. ## Which systems carry lateral load in a light steel building? Section 10.1.2 of the Turkish Building Earthquake Code 2018 (TBDY 2018) groups the lateral load-resisting systems of light steel buildings under two headings: sheathed panel systems and braced panel systems. If the system includes hot-rolled steel members, the steel structures chapter applies as well. The distinction is more than naming. The code classifies the two systems by their earthquake behaviour, and the coefficients used in the calculation depend on that class. So the project should state clearly at the start which system carries the lateral load. ![X strap, K profile, V profile and sheathed panel drawn side by side, with the force-carrying element highlighted in each panel](https://qsteelcad.com/assets/img/blog/sistemler-en.webp) ## What is the difference between X, K, V and sheathed panels? | System | Element | How it works | Most critical check | TBDY 2018 class | | --- | --- | --- | --- | --- | | X-strap bracing | Flat steel strap | Tension only; the opposite strap takes over when the direction reverses | End connection, net section, tensioning, eccentricity | Limited Ductility Level | | K-bracing | C-profile diagonals | Tension and compression | Buckling, node, end bearing | Limited Ductility Level | | V and zigzag layouts | Profile diagonals | Tension and compression | Node location, how the force enters the stud | Limited Ductility Level | | Panel sheathed with OSB or plywood | Board and screws | Sheathing carries force by shear | Screw spacing, stud spacing, chord stud | High Ductility Level | | Panel sheathed with gypsum board | Gypsum board and screws | Sheathing carries force by shear | Cannot resist the earthquake demand alone | Limited Ductility Level | Figure 10.2 of TBDY 2018 does not show a single form for light steel braced panels: next to the X strap there are zigzag layouts in the edge bays, a K-like layout divided by a horizontal bridging member, and V-shaped examples. So K or V are not shapes reserved for heavy steel structures. But appearing in the figure does not mean a layout is adequate in every project. > Section 3 of the 2027 light steel regulation also counts sheet-steel-sheathed wall panels among High Ductility Level systems. The text of TBDY 2018 10.2.1.1 mentions OSB and plywood. The new regulation enters into force on 1 January 2027. ## Are X strap and profile bracing the same thing? No. The same X appearance can hide two different behaviours. A thin strap buckles immediately in compression, so it is assumed to work in tension only; when the load reverses, the opposite strap takes over. A profile brace is expected to carry compression as well. Then the thickness of the section, its unbraced length, the direction of its open face and how its end bears become decisive. Read next: [What is X-strap bracing and how does it work in a light steel wall?](https://qsteelcad.com/en/blog/what-is-x-strap-bracing) Read next: [What is K-bracing? Compression, node and end bearing in profile bracing](https://qsteelcad.com/en/blog/what-is-k-bracing) ## What should you look at when choosing a bracing system? - Load path: does the force pass without a break from the diaphragm to the panel and from the panel to the foundation? - Panel ratio: is the full-height part left between doors and windows enough for the bracing? - Connection: is the brace end defined so that it transfers force to the stud and track? - Chord stud: does the stud carry the tension and compression from the brace, together with the eccentricity moment where there is one? - Anchorage: is there a separate solution for uplift and for sliding? - Storeys: does the panel on the upper storey sit over the panel below? - Production: can the line roll this part, with its holes and end operations? None of the questions in this list is answered by how a drawing looks. The strap width or screw count in a photograph says nothing about the capacity of another building. Each decision has to be calculated with the load, section and connection of its own project. ## Can braced and sheathed panels be used together? They can, with two consequences. TBDY 2018 10.3.1.5 requires at least one hold-down at the shared chord stud of sheathed and braced panels used side by side. Section 3 of the 2027 regulation says that when more than one panel type is used together as structural elements, the overall ductility of the system is set by the panel type with the lower ductility. Gypsum-board-sheathed panels have an additional limit: TBDY 2018 10.2.7.2 does not allow these panels to resist the earthquake demand alone. The share they may take depends on the number of storeys and is given in Table 10.3; the remaining demand is distributed to the other systems. ## What do the regulations require for bracing? The text in force today is TBDY 2018 Chapter 10. Section 10.4.2 gives the member and joint rules for braced panel systems, and 10.4.3 gives the additional conditions for strap bracing that acts in tension only. The Regulation on the Design, Calculation and Construction of Light Steel Buildings, published on 17 May 2026, enters into force on 1 January 2027 and applies to earthquake design in addition to the TBDY rules. Section 6 of the new text brings an explicit layout rule for bracing: braces shall be placed as one continuous member between the top and bottom track of the panel, with their ends connected to the studs as well as the tracks. For layouts divided by bridging or made of short pieces, the project engineer must decide how this sentence applies. Read next: [TBDY 2018 Chapter 10: braced panel rules, clause by clause](https://qsteelcad.com/en/blog/tbdy-2018-chapter-10-braced-panels) Read next: [Turkey's light steel regulation takes effect on 1 January 2027: what changes?](https://qsteelcad.com/en/blog/turkey-light-steel-regulation-2027) ## How is bracing set up in QSteelCAD? In step three of Create architecture from plan, corner bracing has the options None, Zigzag and K; the default is Zigzag. Once the panel is open, the bracing, lintel bracing and K braces commands on the PANEL tab build into the bay you select. If the bay is not suitable, for example because of an opening, a narrow bay or another brace in the same place, no brace is built and the program states the reason. The program builds the brace in a producible form and writes its cut length and operations to the production file. It does not run a load-capacity calculation. Brace type, section and layout affect the capacity of the structure; the project engineer approves adequacy. ## Frequently asked ### Which is the best bracing for light steel? There is no single best brace. The choice depends on load, panel width, openings, connection detail and production capability. Before shape, the path of the force and the ductility class of the chosen system should be settled. ### Can a light steel wall work without bracing? A wall that carries lateral load needs either bracing or structural sheathing. For sheathing to count as structural, the stud spacing, screw pattern and section conditions of the regulation must be met. ### Are the layouts in Figure 10.2 approved standard details? No. The figure shows examples of braced panels. Section, connection and anchorage are calculated separately for each project. ### Why are braced panels counted as Limited Ductility Level? TBDY 2018 10.2.1.2 places buildings whose entire earthquake load is resisted by braced panels or gypsum-board-sheathed panels in this class. The class affects the coefficients used in the calculation and the permitted building height class. ## Related solutions - [Create architecture from plan](https://qsteelcad.com/en/solutions/plan-to-architecture) - [Production and CAM](https://qsteelcad.com/en/solutions/production-and-cam)