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呂梁鋼結構桁架按照不同特征分為哪幾種分類？

?鋼結構是由鋼制材料組成的結構，是主要的建筑結構類型之一。結構主要由型鋼和鋼板等制成的鋼梁、鋼柱、鋼桁架等構件組成，并采用硅烷化、純錳磷化、水洗烘干、鍍鋅等除銹防銹工藝。

桁架結構中的桁架指的是桁架梁，是格構化的一種梁式結構。桁架結構常用于大跨度的廠房、展覽館、體育館和橋梁等公共建筑中。由于大多用于建筑的屋蓋結構，桁架通常也被稱作屋架。
鋼結構桁架可按不同的特征進行分類。
一、根據(jù)桁架的外形分為：
1.平行弦桁架（便于布置雙層結構；利于標準化生產，但桿力分布不夠均勻）；
2.折弦桁架（如拋物線形桁架梁，外形同均布荷載下簡支梁的彎矩圖，桿力分布均勻，材料使用經濟，構造較復雜）；
3.三角形桁架（桿力分布更不均勻，構造布置困難，但斜面符合屋頂排水需要）。
二、以桁架幾何組成方式分：
1.簡單桁架（由一個基本鉸結三角形依次增加二元體組成）；
2.聯(lián)合桁架（由幾個簡單桁架按幾何不變體系的簡單組成規(guī)則聯(lián)合組成）；
3.復雜桁架（不同于前兩種的其它靜定桁架）。
三、按所受水平推力分：
1.無推力的梁式桁架（與相應的實梁結構比較，掏空率大，上下弦桿抗彎，腹桿主要抗剪，受力合理，用材經濟）；
2.有推力的拱式桁架（拱圈與拱上結構聯(lián)為一體整體性好，便于施工，跨越能力強，節(jié)省鋼材料）。

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