防屈曲(qu)支(zhi)(zhi)(zhi)(zhi)撐(cheng)(cheng)可為框架(jia)(jia)或排架(jia)(jia)結構提供很大的(de)抗(kang)側剛(gang)度和承載力(li).支(zhi)(zhi)(zhi)(zhi)撐(cheng)(cheng)體系(xi)(xi)與(yu)(yu)非支(zhi)(zhi)(zhi)(zhi)撐(cheng)(cheng)體系(xi)(xi)荷(he)載位移(yi)曲(qu)線對比圖(tu)1.支(zhi)(zhi)(zhi)(zhi)撐(cheng)(cheng)體系(xi)(xi)與(yu)(yu)非支(zhi)(zhi)(zhi)(zhi)撐(cheng)(cheng)體系(xi)(xi)荷(he)載位移(yi)曲(qu)線對比，采用(yong)支(zhi)(zhi)(zhi)(zhi)撐(cheng)(cheng)的(de)結構體系(xi)(xi)在建筑結構中(zhong)應用(yong)十分廣(guang)泛。

    普通(tong)支(zhi)撐(cheng)(cheng)(cheng)受(shou)(shou)壓(ya)(ya)會產生(sheng)屈曲(qu)(qu)現象，當支(zhi)撐(cheng)(cheng)(cheng)受(shou)(shou)壓(ya)(ya)屈曲(qu)(qu)后(hou)，剛(gang)度(du)和(he)承載力急劇降低。在(zai)(zai)地震(zhen)或風的(de)作(zuo)用(yong)下，支(zhi)撐(cheng)(cheng)(cheng)的(de)內力在(zai)(zai)受(shou)(shou)壓(ya)(ya)圖2.普通(tong)支(zhi)撐(cheng)(cheng)(cheng)試(shi)(shi)驗滯回曲(qu)(qu)線(xian)圖2.普通(tong)支(zhi)撐(cheng)(cheng)(cheng)試(shi)(shi)驗滯回曲(qu)(qu)線(xian)和(he)受(shou)(shou)拉兩種(zhong)狀態(tai)(tai)下往(wang)復變(bian)(bian)化。當支(zhi)撐(cheng)(cheng)(cheng)由壓(ya)(ya)曲(qu)(qu)狀態(tai)(tai)逐(zhu)漸變(bian)(bian)至(zhi)受(shou)(shou)拉狀態(tai)(tai)時(shi)，支(zhi)撐(cheng)(cheng)(cheng)的(de)內力以及剛(gang)度(du)接(jie)近為零。因而普通(tong)支(zhi)撐(cheng)(cheng)(cheng)在(zai)(zai)反復荷(he)載作(zuo)用(yong)下滯回性能較(jiao)差（參見(jian)圖2）。

    為(wei)解決普通支(zhi)撐(cheng)(cheng)受壓(ya)屈曲(qu)(qu)以及滯回(hui)(hui)性(xing)(xing)(xing)能(neng)差(cha)的(de)問題，在支(zhi)撐(cheng)(cheng)外部設置套(tao)管，約束(shu)(shu)支(zhi)撐(cheng)(cheng)的(de)受壓(ya)屈曲(qu)(qu)，構(gou)成(cheng)屈曲(qu)(qu)約束(shu)(shu)圖(tu)3.屈曲(qu)(qu)約束(shu)(shu)支(zhi)撐(cheng)(cheng)構(gou)成(cheng)原理圖(tu)圖(tu).構(gou)成(cheng)原理圖(tu)支(zhi)撐(cheng)(cheng)（參見(jian)圖(tu)3）。屈曲(qu)(qu)約束(shu)(shu)支(zhi)撐(cheng)(cheng)僅芯板與其(qi)他構(gou)件(jian)連(lian)接，所受的(de)荷載全部由芯板。屈曲(qu)(qu)約束(shu)(shu)支(zhi)撐(cheng)(cheng)與普通支(zhi)撐(cheng)(cheng)滯回(hui)(hui)性(xing)(xing)(xing)能(neng)對比圖(tu)4.屈曲(qu)(qu)約束(shu)(shu)支(zhi)撐(cheng)(cheng)與普通支(zhi)撐(cheng)(cheng)滯回(hui)(hui)性(xing)(xing)(xing)能(neng)對比承擔。

    外(wai)套筒(tong)和填充材料僅約束芯板受(shou)壓(ya)屈曲，使芯板在受(shou)拉和受(shou)壓(ya)下(xia)均能(neng)(neng)進入屈服，因而，屈曲約束支(zhi)撐的(de)滯(zhi)回(hui)性(xing)能(neng)(neng)優(you)良。屈曲約束支(zhi)撐一(yi)方面可以避(bi)免普通支(zhi)撐拉壓(ya)承載力差異顯著的(de)缺陷，另一(yi)方面具有金屬阻尼器的(de)耗能(neng)(neng)能(neng)(neng)力，可以在結構(gou)中充當(dang)"保險(xian)絲",使得主體結構(gou)基(ji)本處于(yu)彈性(xing)范圍內(nei)。

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