history architecture, cross section dome, double vaults, san pietro, montorio, rome, vintage illustration, 19th century, victorian - 肋骨條子拱形天花 幅插畫檔、美工圖案、卡通及圖標圖畫 - 藝術品, 建築風格, 義大利文化
bowstring truss (half-parabolic truss) it acts as a tied arch. the curved top chord acts as an arch in compression, and the straight bottom chord acts as a tie rod, resisting the horizontal thrust (outward pushing force) of the arch - 肋骨條子拱形天花 幅插畫檔、美工圖案、卡通及圖標
theory of architecture: piers, columns, arch and vaults - 肋骨條子拱形天花 幅插畫檔、美工圖案、卡通及圖標保險庫大門, 物理學, 拱門 - 建築特色
fish-belly truss ,this design was very popular for railway bridges in the 19th century because the deep "belly" in the center provides maximum strength where the bending force is highest, but uses less metal near the ends where less strength is needed - 肋骨條子拱形天花 幅插畫檔、美工圖案、卡通及圖標
