地震作用下早龄期钢筋混凝土粘结特性试验研究*
- 摘 要
-
杨俊杰1，戴妙娴2（1 浙江工业大学建筑工程学院， 杭州 310014； 2 杭州市运河综合保护开发建设集团， 杭州 310005）［摘要］新浇筑的早龄期混凝土结构受到地震作用后钢筋与混凝土间产生相对变形，尤其是预留钢筋随地震作用的甩动，会导致钢筋与混凝土间粘结特性改变。通过终凝初期(12h)混凝土与钢筋受地震作用（峰值加速度分别为0.45g，0.25g，0.15g，0.06g，0.00g）的模拟试验，探讨了钢筋甩动使混凝土表面产生空穴的机理和形态、受振动后钢筋沿锚固长度的应变分布与粘结应力变化关系、早龄期混凝土在受振后粘结应力损失的规律等。研究结果表明：空穴的大小与振动力大小相关，且会影响钢筋与混凝土的粘结应力分布形态，使有效锚固长度减小。［关键词］早龄期混凝土； 地震作用； 粘结特性； 试验研究中图分类号：TU375 文献标识码：A 文章编号：1002-848X(2013)08-0054-04Experimental study on bond behavior of early-age reinforced concrete under earthquake actionYang Junjie1, Dai Miaoxian2(1 College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China; 2 Hangzhou Canal Protection and Development Construction Group, Hangzhou 310005, China)Abstract:The relative deformation between reinforced bars and concrete would be present in the early-age concrete under the earthquake action, especially with the reinforced bars swinging, the change of bond behavior between reinforced bars and concrete would happen. Simulative experiments of the early-age reinforced concrete (12h) under different degrees of seismic actions(0.45g, 0.25g, 0.15g, 0.06g and 0.00g) were carried out. The mechanism and formation of the gaps in early-age concrete associated with swinging actions of reinforced bars, the stress-strain relationship along the anchorage length, and the loss of bond stress after vibration were investigated. The results show that the scale of gap relates to the seismic forces, changes the distribution of bond stresses, and reduces the effective anchorage length.Keywords: early-age reinforced concrete; earthquake action; bond behavior; experimental study*浙江省重大科技项目资助（2010C13012）。作者简介：杨俊杰，硕士，教授，Email:yjnjie@163.com。参考文献［1］金贤玉，钱春，钱在兹. 对早龄期混凝土产生损伤的试验研究与分析［J］.土木工程学报，1997，30（6）:47-51.［2］金臻丽，杨俊杰，应义淼，等.余震作用下早龄期混凝土强度及损伤试验［J］. 建筑结构，2011，41(3):69-71.［3］戴妙娴，杨俊杰，应义淼，等.余震作用下早龄期混凝土握裹力试验［J］. 建筑结构，2011，41(3):75-77.［4］GB 50152—92混凝土结构试验方法标准［S］.北京：中国建筑工业出版社，1992.［5］郑晓燕. 锈蚀钢筋与混凝土动态粘结性［D］.南京：河海大学，2004：3-13.
