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（1南陽(yáng)理工學(xué)院土木工程學(xué)院， 南陽(yáng) 473000； 2 長(zhǎng)沙理工大學(xué)橋梁工程安全控制教育部重點(diǎn)實(shí)驗(yàn)室， 長(zhǎng)沙 410114；  3 南陽(yáng)市高速公路有限公司， 南陽(yáng) 473000）

［摘要］針對(duì)銹蝕導(dǎo)致鋼筋與混凝土間變形不協(xié)調(diào)而對(duì)結(jié)構(gòu)承載力的影響，引入一個(gè)變形不協(xié)調(diào)系數(shù)來(lái)表示銹蝕鋼筋與混凝土之間的應(yīng)變關(guān)系，根據(jù)6個(gè)RC梁的試驗(yàn)結(jié)果得到變形不協(xié)調(diào)系數(shù)隨銹蝕率的變化關(guān)系。在平截面假定不成立的前提下，考慮變形不協(xié)調(diào)系數(shù)的影響，根據(jù)代數(shù)幾何關(guān)系和內(nèi)力平衡方程求得混凝土的受壓區(qū)高度，進(jìn)而得到相應(yīng)正截面抗彎承載力計(jì)算公式。最后，利用已有文獻(xiàn)的試驗(yàn)結(jié)果驗(yàn)證了該計(jì)算公式的正確性。

［關(guān)鍵詞］鋼筋混凝土梁； 銹蝕； 變形不協(xié)調(diào)系數(shù)； 平衡方程； 抗彎承載力

中圖分類號(hào)：TU441-4文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)04-0044-05

Calculation and analysis of flexural bearing capacity of corroded reinforced concrete beams

Guo Shihui1,2， Liu Bing3

(1 School of Civil Engineering， Nanyang Institute of Technology, Nanyang 473000, China; 

2 Key Laboratory for Safety Control of Bridge Engineering, Changsha University of Science & Technology, Changsha 410114, China;  

3 Nanyang Expressway Limited Company, Nanyang 473000, China)

Abstract:The impact of deformation non-coordination between the steel bars and concrete caused by steel bar corrosion on the flexural bearing capacity of   structure was investigated. A deformation non-coordination coefficient was introduced to express the strain relationship between corroded steel bars and concrete. The relationship between the deformation non-coordination coefficient and the corrosion ratio was obtained based on test results of six  RC beams. On the premise that the plane section assumption was not satisfied and deformation non-coordination coefficient was considered, the compression zone height of concrete was obtained by  algebraic geometry relations  and force equilibrium equations. The corresponding calculation formula of flexural bearing capacity of cross-section  was obtained. Finally, the correctness of the calculation formula was verified by the experimental results from existing literatures.

Keywords:reinforced concrete beam; corrosion; deformation non-coordination coefficient; equilibrium equation; flexural bearing capacity

*河南省基礎(chǔ)與前沿技術(shù)研究計(jì)劃項(xiàng)目(152300410017)， 長(zhǎng)沙理工大學(xué)橋梁工程湖南省高校重點(diǎn)實(shí)驗(yàn)室開(kāi)放基金項(xiàng)目(14KA01)。

作者簡(jiǎn)介：郭詩(shī)惠，碩士，副教授， Email:guoguo91@126.com。