小箱梁預(yù)應(yīng)力CFRP板加固前后荷載試驗(yàn)對(duì)比

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摘 要：為了研究預(yù)應(yīng)力CFRP板加固橋梁在荷載作用下的工作性能，在加固前對(duì)橋梁進(jìn)行荷載試驗(yàn)，然后進(jìn)行預(yù)應(yīng)力CFRP板加固。加固后再次進(jìn)行荷載試驗(yàn)，結(jié)果表明，未開(kāi)裂截面應(yīng)變減少7%，開(kāi)裂截面裂縫寬度明顯減小，撓度減小5%～8%，未能提高結(jié)構(gòu)的整體剛度。

關(guān)鍵詞：預(yù)應(yīng)力CFRP板加固;荷載試驗(yàn);應(yīng)變;撓度

中圖分類號(hào)：U445.72;TU378.2    文獻(xiàn)標(biāo)志碼：A  文章編號(hào)：1003-5168（2022）16-0050-05

DOI：10.19968/j.cnki.hnkj.1003-5168.2022.16.011

Comparison of Load Test before and after Reinforcement of Small Box Girder with Prestressed CFRP Panels

LONG Xingcan    LI Weifeng

（Nanjing Vocational Institute of Transport Technology， Nanjing 211188， China）

Abstract： To study the working performance of the bridge reinforced with prestressed CFRP plates under load， the load test was carried out on the bridge before reinforcement， and then use prestressed CFRP panels were for bridge reinforcement. After reinforcement， the load test was carried out.The results showed that the strain of the uncracked section was reduced by 7%， the crack width of the cracked section was significantly reduced， and the deflection was reduced by 5%～8%， which failed to improve the overall stiffness of the structure.

Keywords： reinforcement of prestressed CFRP panels; load test; strain; deflection

0 引言

碳纖維增強(qiáng)復(fù)合材料（CFRP）加固因具有質(zhì)量輕、強(qiáng)度高、耐久性好、施工便捷等優(yōu)點(diǎn)而被廣泛應(yīng)用于公路混凝土舊橋加固改造工程中[1-2]。（剩余4575字）