Compared to concrete spiral staircases, steel spiral staircases offer advantages such as smaller cross-sections, lighter structure, and a more aesthetically pleasing and streamlined appearance.
Regarding comfort and vibration analysis, the dynamic characteristics of a column-free, beam-less steel spiral staircase were tested using the pulsation method. The natural frequency and damping ratio of the steel staircase were obtained, and an approximate formula for calculating the natural frequency of the column-free, beam-less steel spiral staircase was proposed.
In the specific structural design, a finite element model was established using Midas Gen to obtain the static analysis results of the cantilevered steel spiral staircase around the central column. The bearing capacity and displacement indices meet the requirements of the design specifications, and a comfort analysis was conducted under continuous single-person walking conditions.
Recent technological advancements include the connection structure for outdoor evacuation steel staircases in near-zero energy buildings. This structure includes embedded reinforcing bars, a first thermal break insulation pad, an embedded plate, a first connecting angle steel, a second connecting angle steel, a connecting steel plate, and a second thermal break insulation pad. This structure enables the thermal break between the evacuation steel staircase and the main body of the near-zero energy building, improving the building's thermal insulation performance.