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卓  靜¹，黃福偉¹，李唐寧²
（1 重慶交通科研設(shè)計(jì)院，重慶400067; 2 重慶大學(xué)，重慶400045）

[摘要] 體外錨固預(yù)應(yīng)力CFRP片材加固是一種基于波形齒夾具錨（簡(jiǎn)稱波形錨）的主動(dòng)預(yù)應(yīng)力加固技術(shù)，它采用非粘貼的、預(yù)制的、現(xiàn)場(chǎng)安裝和張拉FRP片材的技術(shù)，施工速度很快。為了模擬實(shí)際橋梁的加固，特別尋找了一片廢棄的l0m預(yù)應(yīng)力混凝土空心板梁進(jìn)行快速加固試驗(yàn)。在空心板加固過程中，一條CFRP片材從兩端固定到中問夾持和錨固，整個(gè)預(yù)應(yīng)力張拉和錨固過程可以在30min內(nèi)完成，實(shí)現(xiàn)了加固的快速施工。試驗(yàn)中對(duì)預(yù)應(yīng)力張拉過程進(jìn)行了測(cè)試，也對(duì)預(yù)應(yīng)力損失進(jìn)行了約7d的觀測(cè)，結(jié)果表明在張拉完成后3h內(nèi)預(yù)應(yīng)力損失稍大，以后就非常微小，一條CFRP片材的有效預(yù)拉力達(dá)150kN左右。最后也對(duì)空心板進(jìn)行了加載試驗(yàn)，試驗(yàn)結(jié)果表明CFRP片材的強(qiáng)度發(fā)揮較充分，使得加固效果得到很大的提高。
[關(guān)鍵詞] CFRP片材；預(yù)應(yīng)力；波形齒夾具錨（簡(jiǎn)稱波形錨）；加固

    Experimental research of prestressed CFRP sheet rapid strengthening hollow concrete slab
    Zhuo Jing¹, Huang Fuwei¹, Li Tangning²
    (1 Chongqing Communication Research & Design Institute, Chongqing 400067, China; 2 Chongqing University, Chongqing 400045, China)

Abstract: It is an active prestressed strengthened technology which prestressed CFRP sheet was external anchored by wave-shaped grip anchorage (WSGA). The CFRP sheet was tensioned speed quickly and wasn't be pasted on site, so the construction technology is very simple and rapid. In order to simulate actual bridge strengthening,a piece of scrap the l0-meter prestressed hollow concrete slab was tested for rapid reinforcement. Consolidation process was completed within 30 minutes in the construction which a CFRP sheet was fixed at the both ends and clamped and anchored on the middle. A rapid strengthening of the construction was achieved. The prestressing stress of CFRP sheet was tested on the tensioning process. And the loss of pre-stress in CFRP sheet was observed about 7 days. The results show that the pre-stress was droped within 3 hours and was gradually stabilized after 3 hours. Effective pre-tension of a CFRP sheet was up t0 150kN. Eventually the hollow slab was experimented by loading. The results showed that the strength of CFRP sheet was be utilized more fully, so the strengthening effect has been greatly improved.
Keywords: CFRP sheet; prestessed; wave-shaped grip anchorage(WSGA); strengthening