ridge purlin的解释
1. 脊檩：ridge gusset plate 屋脊结点联接板 | ridge purlin 脊檩 | ridge tile 脊瓦
2. 脊凛：ridge pole 脊柱 | ridge purlin 脊凛 | ridge rib 脊肋,系脊梁
3. 脊檀：节点荷载 panel load | 脊檀 ridge purlin | 连续檀 continuous purlin