Floor Load: When a Group of People Jumps Together

Presenting the problem faced by performance spaces located on the second floor or above, using a structural cross-section: dynamic loads generated by synchronized jumping crowds can reach two to three times the static load, and the frequency may approach the natural frequency of the floor, causing resonance. The drawing shows steel beam reinforcements added below the original floor slab, temporary support columns under the beams, and a tuned mass damper installed between the floor slab and the ceiling below. A simple diagram nearby illustrates the relationship between load distribution and jumping frequency. Black and white engineering cross-section with annotations, precise lines. Avoid: drawing as a typical floor cross-section, omitting reinforcement components, adding rendering and perspective, depicting the performance space on the ground floor.

Translated from Chinese by AI.

以結構剖視的方式呈現位於二樓以上的展演空間所面對的問題:人群同步跳動產生的動態載重可達靜載的兩到三倍,而且頻率可能接近樓板的自然頻率而共振。圖面顯示原有樓板下方加設的鋼樑補強、梁下的臨時支撐柱,以及在樓板與下層天花之間加設的調諧質量阻尼器。旁邊以簡圖標示載重分布與跳動頻率的關係。黑白工程剖視加標註,線條精確。避免:畫成一般的樓板剖面、省略補強構件、加入渲染與透視、把展演空間畫在地面層。