同样是 40m 无柱空间，三种结构形式的用钢量能差 40%。按用途选型才是省钱之道。Three ways to span 40m — steel tonnage can differ by 40%. Choose by use, not by habit.
不少客户开口就要「40 米跨度」，但实现方式至少有三种，用钢量与造价差异很大：
门式刚架变截面方案：40m 已接近经济上限，用钢量约 45–55kg/㎡，屋面坡度灵活，是最常见的选择，适合一般厂房仓库。
桁架方案：用钢量约 35–45kg/㎡，构件高度大（跨度的 1/10 左右），但内部可穿管线，适合机库、展厅等对空间形态有要求的项目。
螺栓球网架：适合双向大跨度或异形平面，用钢量 30–40kg/㎡，杆件数量多、安装精度要求高，体育馆、游泳馆常用。
选型逻辑一句话：矩形平面单跨选刚架或桁架，双向大跨或曲面造型选网架。把功能需求告诉工程师，比直接指定结构形式更能省钱。
When clients ask for a 40m span, there are at least three ways to achieve it — with tonnage and cost differing widely:
Variable-section portal frame: 40m is near its economic limit; about 45–55 kg/m² of steel, flexible roof slope, the default choice for ordinary plants and warehouses.
Truss: about 35–45 kg/m², deeper members (roughly 1/10 of span), but services can run through — good for hangars and exhibition halls where the space itself matters.
Bolted-ball space frame: suits two-way spans or irregular plans at 30–40 kg/m², with many members and demanding accuracy — typical for gymnasiums and swimming halls.
One-line logic: rectangular single-span, pick frame or truss; two-way spans or curved roofs, pick a space frame. Describing your function to the engineer saves more money than prescribing the structure.
上海雄岚钢结构 · 出口 60+ 国家 · EN 1090 CE 认证 · 24 小时内工程师回复
联系工程师 / Talk to an engineer 查看产品体系