陈宗平1,2,  范杰1,  叶培欢1, 郑巍1

（1 广西大学土木建筑工程学院， 南宁 530004；2 广西大学工程防灾与结构安全教育部重点实验室， 南宁 530004）

 

［摘要］为了研究钢筋再生混凝土梁的受力性能，设计并制作了6根钢筋再生混凝土梁试件，进行静力单调加载试验，观察不同剪跨比下钢筋再生混凝土梁的破坏过程及破坏形态，绘制出荷载-变形、荷载-应变等关系曲线，分析了再生粗骨料取代率、剪跨比对试件极限承载力的影响；采用规范公式计算试件极限承载力和刚度并与试验值进行对比分析。结果表明：再生混凝土梁与普通混凝土梁破坏过程和形态相似，根据剪跨比的不同，表现为剪切斜压和弯曲破坏两种形态；随着再生粗骨料取代率的增加，试件的极限承载力略有降低，而随着剪跨比的增大，极限承载力则显著降低；现行混凝土规范方法可适用于钢筋再生混凝土梁的极限承载力及短期刚度计算。

［关键词］再生混凝土梁；受力性能；强度计算

中图分类号：TU398.7      文献标识码：A      文章编号：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

*国家自然科学基金（50908057），“八桂学者”建设工程专项经费资助，广西自然科学基金（2012GXNSFAA053203），广西科技攻关项目（桂科攻12118023-3），广西理工科学实验中心重点项目(LGZX201102)。

作者简介：陈宗平，博士，教授，博士生导师，Email:zpchen@gxu.edu.cn。

 

参考文献

［1］肖建庄，李佳彬，兰阳．再生混凝土技术最新研究进展与评述［J］．混凝土，2003(10)：17-20，57．

［2］HANSEN T C. Recycling of demolished concrete and masonry［M］. London: Spon Press，1990.

［3］TOPCU I B．Physical and mechanical properties of concrete produced with waste concrete［J］．Cement and Concrete Research,1997，27(12)：1817-1823．

［4］史巍，候景鹏．再生混凝土技术及其配合比设计方法［J］．建筑技术开发,2001，28(8)：18-20．

［5］NIXON P J．Recycled concrete as an aggregate for concrete-a review［J］．Materials and Structures，1978，11(5)：371-378．

［6］KHATIB J M．Properties of concrete incorporation fine recycled aggregate［J］．Cement and Concrete Research,2005,35(4)：763-769．

［7］屈志中．钢筋混凝土破坏及其利用技术的新动向 ［J］．建筑技术，2001，32(2)：102-104．

［8］GB 50010—2010混凝土结构设计规范［S］．北京：中国建筑工业出版社,2011．

［9］陈宗平，余兴国，柯晓军．再生混凝土抗折强度试验研究［J］．混凝土，2010(6):58-60，120．

［10］DHIR R K, LIMBACHIYA M C. Suitability of recycled aggregate for use in BS 5328 designated mixes［J］. Proceedings of the Institution of Civil Engineers, 1999, 134（3）: 257-2741.