Portal frames. Portal frames are generally low-rise structures, comprising columns and horizontal or pitched rafters, connected by moment-resisting connections... This form of continuous frame structure is stable in its plane and provides a clear span that is unobstructed by bracing.
Steel frame is a building technique with a "skeleton frame" of vertical steel columns and horizontal I-beams, constructed in a rectangular grid to support the floors, roof and walls of a building which are all attached to the frame. The development of this technique made the construction of the skyscraper possible.
Because steel structure has many advantages. Firstly, high strength. The high ratio of strength to weight(the strength per unit weight). Secondly, excellent ductility and seismic resistance. Withstand extensive deformation without failure even under high tensile stress. Third, elasticity, uniformity of material. Predictability of properties, close to design assumption. Fourth, ease of fabrication and speed of erection.
The best way to stop a leak is before it starts. Here’s how to stop metal roof and wall leaks:
1. Choose a high quality metal building kit. All steel building systems are not created equal. RHINO’s steel building systems, for example, include several waterproofing features designed to keep your building problem-free.
First of all, our commercial-grade rigid steel framing protects against damage from pounding rains and snows.
Secondly, RHINO includes high-quality 26-gauge purlin bearing rib (PBR) steel panels in the standard package, at no additional price. PBR panels provide greater strength and a deeper overlap between panels, for a much sturdier building skin than the thinner R-panels used by cheaply made metal buildings.
Thirdly, RHINO includes top-of-the-line, self-drilling, rust-resistant screws with long-lasting washers for extra sealing protection.
2. Install screws properly. No fastener system seals well unless the screws are installed correctly.
First, the screws must hit the steel framing below. If the screw misses the purlin or girt, the washer does not seal, and a leak is inevitable.
Secondly, in order to prevent leaks the self-drilling screws that attach steel roof and wall panels must be drilled in straight, not crooked.
Thirdly, screws with washers must be drilled to the correct depth. If the seal is overtightened, the over-compressed may leak. If not tightened enough, the washer does not form tight seal, and may leak.
When correctly installed and maintained, RHINO’s fasteners should never leak.