- 摘 要
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（1 寧波工程學(xué)院建筑與交通學(xué)院， 寧波 315211； 2 鄭州大學(xué)土木工程學(xué)院， 鄭州 450001;3 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，研究分析不同銹蝕率下的鋼筋混凝土梁受彎承載力及其失效模式。研究表明，當(dāng)試驗梁縱筋銹蝕率較低時（ηz≤10%），構(gòu)件承載性能隨銹蝕率增加而不斷降低。當(dāng)縱筋銹蝕率較高時，銹蝕率對構(gòu)件承載性能的影響具有一定的不確定性，當(dāng)縱筋銹蝕率ηz>15%時，試驗梁極限荷載與結(jié)構(gòu)鋼筋初始銹脹裂縫面積之間存在一定的關(guān)系；箍筋銹脹產(chǎn)生的垂直裂縫會在加載過程中逐漸發(fā)展成為主裂縫，最終導(dǎo)致構(gòu)件的破壞；隨著縱筋銹蝕率的增大，試驗梁由適筋破壞逐漸變成類似少筋破壞，部分試驗梁發(fā)生了脆性破壞。
［關(guān)鍵詞］鋼筋混凝土梁； 銹蝕率； 受彎承載力； 失效模式
中圖分類號：TU375文獻(xiàn)標(biāo)識碼：A文章編號：1002-848X(2017)17-0088-05
Research on flexural bearing capacity and failure mode of corroded reinforced concrete beams
Zhao Zhuo1, Zeng Li2, Wang Fei3, Yuan Chengfang2
(1 School of Architecture and Traffic Engineering, Ningbo University of Technology, Ningbo 315211, China; 2 School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China; 3 Faculty of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315211, China)
Abstract:The test of corroded reinforced concrete beams was carried out to research and analyze the flexural bearing capacities and failure modes of reinforced concrete beams with different corrosion rates. Research shows that when the test beam has low longitudinal reinforcement corrosion rate(ηz≤10%), the bearing capacity of the beams reduces with the increase of corrosion rate. When the longitudinal reinforcement corrosion rate is high, the influence of corrosion rate on bearing capacity of beams has certain uncertainty. When the longitudinal reinforcement corrosion rate ηz>15%, there is a certain relationship between the limit load of test beam and initial corrosion expansion crack area of the structure. The vertical crack caused by stirrup corrosion expansion would gradually become the main crack in the loading process, eventually leading to the destruction of components. With the increase of the longitudinal reinforcement corrosion rate, test beam gradually changes from appropriate reinforcement damage to rare-reinforced damage, and some test beams face brittle failure.
Keywords:reinforced concrete beam; corrosion rate; flexural bearing capacity; failure mode
*寧波市橋梁技術(shù)科技創(chuàng)新團(tuán)隊（2014B81003）。
作者簡介：趙卓，博士，教授，Email：zzhuo_99@163.com。
