【正文】 ns designed according to the proposedequations. It is concluded that steel jackets significantly increase the shear strength and flexural ductility of shear deficient columns, which is shown in Table . Specimenswith an A are asbuilt columns and an R represents retrofitted columns FRP Jacketing Fiber reinforced polymer (FRP) confinement can be provided using several positematerials including fiberglass, carbon fiber, and Kevlar bonded to the confined concretesurface using epoxy (Priestley et al. 1996). Weight and crosssection of the retrofittedmember are not significantly affected with FRP jackets. FRP jackets are most applicablefor circular columns, as stress concentrations can develop in the FRP wrap around thecorners of square or rectangular crosssections. FRP jackets can be used for rectangularor other shaped members, if shape modification is performed to prevent stress concentrations from developing. Two types of FRP retrofits, wraps and prefabricatedposite jackets, are typically utilized. FRP Wraps FRP wraps have several benefits including high strength, light weight, resistance tocorrosion, low cost, and versatility (Saadatmanesh et al. 1997). FRP wrapping is performed by first cleaning the surface of the member to be retrofitted. Epoxy or resin isthen used to attach the flexible FRP fabric to the surface of the me mber to be fabric can be applied dry, but the preferred method is to soak the fabric in epoxybefore application to allow for better cohesion with the surface of the member to beretrofitted. The fabric is then smoothed out to ensure no air pockets exist and extra epoxyis squeezed out the sides. A new layer of epoxy should be applied between each layer offabric and a final layer of epoxy on the outermost surface of the fabric. The wrap shouldthen be allowed to cure at ambient temperatures Saadatmanesh et al. (1997) applies FRP wraps to repair severely damaged reinforcedconcrete columns. Critically stressed regions near the column footing joint are repairedwith FRP wrap. It is evident from the results that FRP posite wraps effectivelyrestore flexural strength and ductility in damaged columns. Similarly, Gergely et al.(1998) uses carbon FRP wrap to test the performance enhancement of reinforced concretecap beams and cap beamcolumn joints. The research shows that FRP wraps cansignificantly increase the shear capacity and ductility of cap beams and cap beamcolumnjoints. Hadi (2020) performs similar tests on concrete beams and concludes that FRP wraps contribute to the load carrying capacity, as well as flexural strength, of reinforcedconcrete beams. Additional layers of FRP result in increased flexural strength. Xiao and Wu (2020b) perform a prehensive research program to study the behaviorof concrete confined by various types of FRP wraps. Carbon fiber as well as Eglasswraps are investigated. The methods of application vary between in situ (hand layup)and machinewound application. Again, it is determined that FRP posite jacketssignificantly increase the strength and ductility of concrete 試驗(yàn)研究鋼筋混凝土柱改造方法 簡(jiǎn)介 ： 隨著我國(guó)基礎(chǔ)設(shè)施不斷老化， 因此 需要進(jìn)行改造 的設(shè)施不斷 增加。許多建筑物和橋梁的結(jié)構(gòu)組件不再 能夠 提供 足夠的強(qiáng)度來(lái) 滿足 要求。 升級(jí)加固是 應(yīng)對(duì)這一重大問(wèn)題 的方法之一 。此外，由于混凝土開(kāi)裂，鋼筋銹蝕，或其他損害 ，使 許多公共設(shè)施 不再提供原設(shè)計(jì) 要求的 承載能力 。 在本研究中， 對(duì)怎樣 提高鋼筋混凝土柱軸向負(fù)載能力進(jìn)行了測(cè)試和分析。 目前 應(yīng)對(duì) 方法包括混凝土柱加裝護(hù)套，鋼套管，增強(qiáng)纖維復(fù)合材料（ FRP）的護(hù)套。 以上 三種方法 已 被證明能有效地提高 混凝土 柱軸向負(fù)載能力。此外，新技術(shù) PCS加固， 有 可能 成為 加固 混凝土柱的改造方法。 項(xiàng)目范圍 ： 三 種 加固改造方案具體 包括 護(hù)套 、 鋼套管 、 及玻璃鋼包裝。三種不同 方案 提供 給 混凝土 一定的承載力 ：一個(gè)螺旋橫向鋼筋 混凝、 WWF和上述 構(gòu) 件 。 所有標(biāo)本軸向載荷下進(jìn)行了測(cè)試壓縮 ， 應(yīng)用負(fù)載和整個(gè) 位 移測(cè)量，直到故障檢測(cè) 達(dá)到標(biāo)準(zhǔn)為止 。此外， 并對(duì) 整個(gè)測(cè)試進(jìn)行了觀察和記錄。新推出的加固 技術(shù) 與目前使用在 結(jié)構(gòu)工程領(lǐng)域 的 應(yīng)用程序傳統(tǒng) 技術(shù) 進(jìn)行了比較。 并對(duì)其優(yōu)勢(shì)、劣勢(shì)進(jìn)行了一一鑒定 。此外， 此項(xiàng)目還 分別給出了對(duì)混凝土柱改造