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（1 華東交通大學(xué)土木建筑學(xué)院， 南昌 330013； 2 江西省建筑過(guò)程模擬與控制重點(diǎn)實(shí)驗(yàn)室， 南昌 330013； 3 江西交通職業(yè)技術(shù)學(xué)院建筑工程系， 南昌 330013）

［摘要］以混凝土骨料類型和腐蝕程度為主要變化參數(shù)，設(shè)計(jì)了6個(gè)方鋼管混凝土試件，先將其置于酸雨腐蝕溶液中對(duì)其進(jìn)行通電加速腐蝕，再對(duì)其純彎力學(xué)性能進(jìn)行分析。試驗(yàn)結(jié)果表明：腐蝕前期，實(shí)測(cè)的腐蝕厚度略低于理論的腐蝕厚度，后期則較為接近；方鋼管再生混凝土試件與方鋼管普通混凝土試件有著類似的破壞形態(tài)，鋼管再生混凝土的極限承載力比鋼管普通混凝土略低；隨著腐蝕程度的加深，試件的彈性階段剛度、承載力及后期延性下降，且目標(biāo)腐蝕度為20%的試件比目標(biāo)腐蝕度為10%的試件極限承載力下降幅度更大。通過(guò)有限元軟件ABAQUS計(jì)算方鋼管再生混凝土構(gòu)件的純彎力學(xué)性能，并對(duì)其彎矩-撓度關(guān)系曲線進(jìn)行分析。計(jì)算結(jié)果表明：有限元模擬的試件在線彈性階段的剛度比試驗(yàn)中略大，但所得到的各個(gè)試件的極限承載力和試驗(yàn)結(jié)果比較接近，且有限元計(jì)算模型的破壞模態(tài)與試驗(yàn)中試件的破壞形態(tài)吻合得也較好，折減鋼管壁厚的方法可以有效模擬酸雨腐蝕對(duì)鋼管普通（或再生）混凝土純彎試件承載力的影響。

［關(guān)鍵詞］酸雨腐蝕； 方鋼管再生混凝土； 純彎性能； 靜載試驗(yàn)； 有限元分析

中圖分類號(hào)：TU398+.9文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2018)02-0066-06

Experimental study on pure bending mechanical behavior of recycled concrete-filled square steel tube under acid rain

Huang Hong1,2, Sun Wei1,3, Chen Mengcheng1, Zhu Qi1

(1 School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China; 2 Jiangxi Key Laboratory of Control and Simulation of Construction Process, Nanchang 330013, China; 3 Department of Architecture Engineering, Jiangxi V＆T College of Communication, Nanchang 330013, China)

Abstract:Totally 6 concrete-filled square steel tube with different types of concrete aggregates and corrosion degrees were designed and put into the acid rain corrosion solution to undergo accelerated electric corrosion, and then the pure bending performance was analyzed. The experimental results show that in the initial stage of corrosion, the corrosion thickness measured is slightly lower than the theoretical thickness of corrosion, and they are close in the latter stage; recycled concrete-filled square steel tubular components have similar damage form as ordinary concrete-filled square steel tubular components, and the ultimate bearing capacity of the former is slightly lower than that of latter component. With the deepening of the degree of corrosion, the stiffness and bearing capacity in elastic stage and ductility of the late stage decline, and the ultimate bearing capacity of specimens with 20% corrosion degree decreases much more than that of specimens with 10% corrosion degree. The pure bending mechanical properties of recycled concrete-filled square steel tube were calculated by finite element software ABAQUS, and the curve of the moment-deflection relationship was analyzed. The calculation results show that the stiffness of specimens simulated by finite element in linear elastic stage is slightly larger than that in experiment, but the ultimate bearing capacity results are close. The failure form of the finite element calculation model meets with the failure form of experimental specimens. The method of reducing the wall thickness of steel tube can effectively simulate the influence of acid rain on the bearing capacity of ordinary or recycled concrete pure bending specimens.

Keywords:acid rain erosion; recycled concrete-filled square steel tube; pure bending performance; static test; finite element analysis

*國(guó)家自然科學(xué)基金項(xiàng)目（51378206，51008122），江西省青年科學(xué)基金計(jì)劃（20143ACB21020）。

作者簡(jiǎn)介：黃宏，博士，教授，Email: huanghong1977@foxmail.com。