銹蝕對超期服役非對稱截面鋼格構(gòu)柱受力性能影響研究*
吳海英1,2，雷宏剛2，劉貴全1，郭昭勝2
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（1 山西大學(xué)土木工程系， 太原 030013； 2 太原理工大學(xué)建筑與土木工程學(xué)院， 太原 030024）
［摘要］基于超期服役鋼結(jié)構(gòu)廠房現(xiàn)場檢測數(shù)據(jù)，研究了銹蝕對非對稱截面鋼格構(gòu)柱受力性能的影響。根據(jù)PKPM軟件彈性階段內(nèi)力計(jì)算結(jié)果，運(yùn)用ABAQUS軟件對考慮不同銹蝕深度的鋼格構(gòu)柱按三種銹蝕方式進(jìn)行非線性數(shù)值分析，探究其承載力的衰減規(guī)律。根據(jù)銹蝕破壞形態(tài)、極限荷載-銹蝕深度（Pu-D）和銹蝕荷載軸向位移（P-s）曲線可知，隨銹蝕深度D的增加，Pu-D曲線出現(xiàn)分界點(diǎn)，破壞形態(tài)發(fā)生改變，當(dāng)腹板參與銹蝕，且銹蝕深度D≥4mm時鋼格構(gòu)柱發(fā)生有脆性特征的破壞；與翼緣銹蝕相比，在構(gòu)件屈曲中起支撐作用的腹板銹蝕對鋼格構(gòu)柱危害更大；翼緣單面銹蝕深度D≤3mm、腹板銹蝕深度D≤1mm時，鋼格構(gòu)柱極限荷載、塑性性能均有所提高和改善；最后提出臨界銹蝕深度概念，可用于結(jié)構(gòu)狀態(tài)監(jiān)測和維修加固。［關(guān)鍵詞］銹蝕; 鋼格構(gòu)柱; 非對稱截面; 受力性能; 后屈曲中圖分類號：TU391， TU311.2 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2016)09-0079-07
Research on influence of corrosion on mechanical behavior of extended service steel lattice column with asymmetrical cross-sectionWu Haiying1,2, Lei Honggang2, Liu Guiquan1, Guo Zhaosheng2（1 Civil Engineering Department of Shanxi University, Taiyuan 030013, China; 2 Architecture and Civil Engineering College, Taiyuan University of Technology, Taiyuan 030024, China）Abstract: Based on field testing data of extended service steel structure workshop, the influence of corrosion on mechanical behavior of extended service steel lattice column with asymmetrical cross-section was studied. According to the PKPM's internal force calculation results of the columns in elastic stage, the software of ABAQUS was used to conduct nonlinear numerical analyses on steel lattice columns with different corrosion depths using three kinds of corrosion methods to research the attenuation law of bearing capacity. On the basis of corrosion failure patterns, the ultimate load-corrosion depth (Pu-D) and corrosion load-axial displacement (P-s) curves, it reaches conclusions as follows: with the increase of the corrosion depth D, there appears cut-off point in Pu-D curve and failure pattern changes, and the steel lattice column has characteristics of brittle failure when web is involved in corrosion and corrosion depth D≥4mm; compared with the flange corrosion, web corrosion acting supporting role in the component buckling is far more damaging to steel lattice column; when the flange's single side corrosion depth D≤3mm and the web corrosion depth D≤1mm, the ultimate load and the plastic properties of steel lattice column are developed and improved in some extent; finally, the concept of critical corrosion depth was put forward for structural condition monitoring, maintenance and reinforcement.Keywords: corrosion; steel lattice column; asymmetrical cross-section; mechanical performance; post-buckling
*國家自然科學(xué)基金資助項(xiàng)目（51578357）。作者簡介：吳海英，博士研究生，講師，Email: why2004-08@163.com。
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