The portal frame unidirectional seismic bracing uses a classic two-column, one-beam portal frame with double diagonal braces installed on one vertical plane of the frame. That braced plane delivers strong unidirectional horizontal resistance, while the frame itself provides vertical load-bearing and lateral stability. The double V-shaped braces on one side raise horizontal stiffness significantly against a dominant force direction, while the opposite side relies on column bending stiffness for auxiliary restraint. This asymmetric arrangement reinforces only the direction that analysis identifies as critical, avoiding over-engineering in the other axis and balancing safety against cost.
We build the unidirectional portal to a specific load path and offer OEM project-specific design. Column gauge, beam span, and the side that receives the double V-braces are chosen from your site's dynamic analysis - for example, a dominant seismic wave direction, a prevailing wind load, or equipment vibration - so the steel goes where the force actually travels. Under OEM/ODM we can develop the frame around your project drawing, including custom column heights and anchor patterns, and brand it as your supplied solution. Buyers get a frame optimized for one load path rather than paying for a fully symmetric bidirectional portal they do not need.
Specifications
|
Parameter |
Specification |
|
Frame type |
Two-column, one-beam portal |
|
Brace arrangement |
Double V-braces on one vertical plane |
|
Directional restraint |
Unidirectional (defined plane) |
|
Material |
Channel-steel columns and beam; steel struts |
|
Design standard |
GB 50981 |
|
Load class |
Heavy |
|
Opposite-side restraint |
Column bending stiffness (auxiliary) |
Applications
- Steam-water pipelines in thermal power plants with a known dominant vibration direction. The reinforced single plane resists the steady oscillating force, while the frame carries the heavy pipe weight.
- Long straight outdoor transmission pipe corridors in high-wind areas. One-direction bracing controls wind-induced sway along the corridor at lower steel cost than a bidirectional portal.
- Rows of heavy cable containment where the seismic analysis identifies a single governing axis. It integrates with standard bidirectional units at transition points to form a mixed, cost-optimized system.
Customization
We select which frame face carries the double V-braces, set column height and beam span to your drawing, adjust gauge for heavy loads, and provide OEM/ODM design and branding from your project files.
Packaging & Transportation
Frames and struts are bundled into fumigation-free plywood crates reinforced for international shipment. Trade terms include FOB, EXW, and DDP; payment is by T/T.
FAQ
Q: Why choose unidirectional over a full bidirectional portal?
A: Where site analysis shows one governing force direction, reinforcing only that plane cuts steel and cost without compromising safety.
Q: Can you design this around our project drawings as an OEM?
A: Yes. We develop the frame geometry, anchor pattern, and branding from your files under OEM/ODM terms.
Q: Do you support third-party inspection?
A: Yes. Core components are selected carefully, the unit is 100% checked before packing, and third-party inspection is welcomed.
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