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陳宗平1,2,  范杰1,  葉培歡1, 鄭巍1

（1 廣西大學(xué)土木建筑工程學(xué)院， 南寧 530004；2 廣西大學(xué)工程防災(zāi)與結(jié)構(gòu)安全教育部重點(diǎn)實(shí)驗(yàn)室， 南寧 530004）

 

［摘要］為了研究鋼筋再生混凝土梁的受力性能，設(shè)計(jì)并制作了6根鋼筋再生混凝土梁試件，進(jìn)行靜力單調(diào)加載試驗(yàn)，觀察不同剪跨比下鋼筋再生混凝土梁的破壞過程及破壞形態(tài)，繪制出荷載-變形、荷載-應(yīng)變等關(guān)系曲線，分析了再生粗骨料取代率、剪跨比對(duì)試件極限承載力的影響；采用規(guī)范公式計(jì)算試件極限承載力和剛度并與試驗(yàn)值進(jìn)行對(duì)比分析。結(jié)果表明：再生混凝土梁與普通混凝土梁破壞過程和形態(tài)相似，根據(jù)剪跨比的不同，表現(xiàn)為剪切斜壓和彎曲破壞兩種形態(tài)；隨著再生粗骨料取代率的增加，試件的極限承載力略有降低，而隨著剪跨比的增大，極限承載力則顯著降低；現(xiàn)行混凝土規(guī)范方法可適用于鋼筋再生混凝土梁的極限承載力及短期剛度計(jì)算。

［關(guān)鍵詞］再生混凝土梁；受力性能；強(qiáng)度計(jì)算

中圖分類號(hào)：TU398.7      文獻(xiàn)標(biāo)識(shí)碼：A      文章編號(hào)：1002-848X(2013)09-0092-04

 

Experimental study on mechanical behavior of reinforced recycled aggregate concrete beams

Chen Zongping1,2, Fan Jie1, Ye Peihuan1, Zheng Wei1

（1 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China; 2 Key Laboratory of Disaster Prevention and Structural Safety of China Ministry of Education, Guangxi University, Nanning 530004, China)

 

Abstract: In order to reveal the mechanical behavior of reinforced recycled aggregate concrete beams, 6 specimens were designed for the test. The failure process and modes, load-deformation and load strain curves were obtained from the experiment. Based on the test data, the influence of recycled aggregate replacement ratio and shear span ratio on the bearing capacity were analyzed. The ultimate bearing capacity and stiffness calculated by code formula were compared with the test values. The results show that the failure pattern of reinforced recycled aggregate concrete beams is similar to that of ordinary reinforced concrete beams. Two types of failure patterns, which are shear pressure failure and bending failure, are appeared for different shear span ratios. With the increase of recycled aggregate replacement ratio, the ultimate bearing capacity slightly decreases, but it decreases obviously with the increase of shear span ratio. Methods in concrete code could be applied to the calculations of ultimate bearing capacity and short-term stiffness of reinforced recycled concrete beams.

Keywords: recycled aggregate concrete beam; mechanical behavior; strength calculation

*國家自然科學(xué)基金（50908057），“八桂學(xué)者”建設(shè)工程專項(xiàng)經(jīng)費(fèi)資助，廣西自然科學(xué)基金（2012GXNSFAA053203），廣西科技攻關(guān)項(xiàng)目（桂科攻12118023-3），廣西理工科學(xué)實(shí)驗(yàn)中心重點(diǎn)項(xiàng)目(LGZX201102)。

作者簡(jiǎn)介：陳宗平，博士，教授，博士生導(dǎo)師，Email:zpchen@gxu.edu.cn。

 

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