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gung2係常見建築結構之一,型態定義為中央上半成圓弧曲線。拱早期經常用喺橋或者門頂。又可以分為箱形拱、圓弧拱、雙曲拱、肋拱、桁架拱、剛架拱等。近年嚟,各國喺拱橋嘅設計上,除咗講究安全實用之外,亦強調拱軸線優化,連拱計算、拱式建築荷載橫向分佈,令各種形式嘅拱式建築完善。


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