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（1 武漢理工大學(xué)土木工程與建筑學(xué)院，武漢 430070； 2 鄭州市市政工程管理處，鄭州 450053；3 寧波工程學(xué)院建筑與交通工程學(xué)院，寧波 315211；4 鄭州大學(xué)土木工程學(xué)院，鄭州 450001；5 寧波大學(xué)機(jī)械工程與力學(xué)學(xué)院，寧波 315211）

［摘要］開展銹蝕鋼筋混凝土梁受彎試驗(yàn)，通過試驗(yàn)梁變形曲線、荷載撓度曲線及混凝土應(yīng)變曲線等對(duì)試驗(yàn)梁變形性能進(jìn)行深入分析。研究表明，在荷載作用下，試驗(yàn)梁B15-1，B15-2從屈服至破壞階段的變形急劇增大，試驗(yàn)梁B15-2發(fā)生了脆性破壞。隨著縱筋銹蝕率的增大，試驗(yàn)梁的屈服荷載及極限荷載均逐漸下降，屈服階段不再明顯，混凝土應(yīng)變曲線不再符合平截面假定。當(dāng)縱筋銹蝕率小于10%時(shí)，試驗(yàn)梁的剛度隨銹蝕率的增大略有增加，當(dāng)縱筋銹蝕率大于10%時(shí)，試驗(yàn)梁剛度下降較快，且變形不再協(xié)調(diào)。

［關(guān)鍵詞］鋼筋混凝土梁； 銹蝕率； 受彎； 變形性能

中圖分類號(hào)：TU375文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)17-0093-04

Deformation performance analysis of corroded reinforced concrete beam

Zhang Haohua1,2, Zhao Zhuo3, Yuan Chengfang4, Wang Fei5

(1 School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China; 2 Zhengzhou Municipal Engineering Administration Department, Zhengzhou 450053, China; 3 School of Architecture and Traffic Engineering, Ningbo University of Technology, Ningbo 315211, China; 4 School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China; 5 Faculty of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315211, China)

Abstract:The flexural tests were carried out on corroded reinforced concrete beams to study the deformation performance of the test beams through deformation curve, load-deflection curve and concrete strain curve of test beams. The results show that under the loading actions, the deformations of the test beam B15-1 and B15-2 increase sharply from the yielding stage to the failure stage, and the brittle failure happens on the test beam B15-2. With the increase of corrosion rate of longitudinal reinforcement, the yielding load and ultimate load of the test beam decrease gradually,  the yielding stage is no longer obvious, and the concrete strain curve no longer conforms to the plane section assumption. When the corrosion rate of the longitudinal reinforcement is less than 10%, the rigidity of the test beam increases slightly with the increase of the corrosion rate. When the corrosion rate of the longitudinal reinforcement is larger than 10%, the rigidity of the test beam declines rapidly and the deformation is no longer coordinated.

Keywords:reinforced concrete beam; corrosion rate; flexural; deformation property

*寧波市橋梁技術(shù)科技創(chuàng)新團(tuán)隊(duì)（2014B81003），河南省科技廳重點(diǎn)科技攻關(guān)項(xiàng)目（142102310490）。

通訊作者：趙卓，博士，教授，Email：zzhuo_99@163.com。