C40早龄期钢筋混凝土偏压柱受力性能试验研究*
- 摘 要
-
（1 中国建筑股份有限公司技术中心， 北京 101300；2 北京交通大学土木建筑工程学院， 北京 100044）［摘要］为了研究C40早龄期钢筋混凝土偏压柱静力性能，对5根不同龄期（1，3，7，28，90d）时C40钢筋混凝土偏压柱进行了单调静力加载试验。主要研究了不同龄期时C40钢筋混凝土偏压柱的承载能力、破坏形态、变形特性、钢筋与混凝土共同工作性能。研究结果表明：混凝土早龄期（7d前）对试件的承载能力、破坏特征、变形特征、钢筋与混凝土共同工作性能有不同影响，并与混凝土在各种性能指标中的参与程度密切相关；极限承载力随龄期增长呈非线性增长，前7d增长较快，7d后增速变缓；对于破坏形态、变形特性，3d以前试件差异较大，3d以后试件与28d试件相似；钢筋与混凝土共同工作性能在3d龄期前较差，3d龄期以后二者共同工作性能增强，混凝土与钢筋间粘结强度较大，变形能力趋于一致。［关键词］早龄期钢筋混凝土柱; 偏心受压; 试验研究; 受力性能中图分类号：TU375.3 文献标识码：A 文章编号：1002-848X(2013)21-0058-05Experimental study on behavior of C40 RC eccentric compressive columns of early-ageWang Dongyan1, Yang Zhenkun2, Wu Yuegang2, Wang Mengmeng2, Yuan Quan2, Lin Bing1, Liao Juan1(1 Technical Center of China State Construction Engineering Co., Ltd., Beijing 101300, China; 2 School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China)Abstract: In order to study the behavior of C40 reinforced concrete（RC）eccentric compressive columns of early-age, five C40 RC eccentric compressive columns in different age（1,3,7,28,90d）were experimented under static load. The bearing capacities, failure characteristics, deformation features, co-working properties of rebar and concrete were obtained from the test under the consideration of curing-age. The test shows that the concrete in early age (7d ago) has different effects on the bearing capacities, failure characteristics, deformation features, co-working properties of rebar and concrete of the specimens, which closely relates with levels of concrete participation in a variety of performance indicators. Ultimate strength is nonlinear growth with age, the rate before 7d is much quicker than after 7d; the failure characteristics, deformation features are similar to the specimens of 28d. The co-working properties of rebar and concrete are poor before 3d, but after 3d the bond strength becomes greater and then the co-working properties of rebar and concrete are very good and deformations are consistent.Keywords: early-age reinforced concrete column; eccentric compressive; experimental study; mechanical behavior*中建科技项目（CSCEC-2010-Z-02），国家科技支撑计划（2006BAJ01B04）。作者简介：王冬雁，博士，高级工程师，Email: wangdongyan@cscec.com。参考文献［1］GB 50204—2002混凝土结构工程施工质量验收规范［S］. 北京：中国建筑工业出版社，2011.［2］金贤玉，田野，金南国. 混凝土的早龄期性能与裂缝控制［J］. 建筑结构学报，2010, 31(6): 205-212.［3］OLUOKUN FRANCIS A, BURDETTE EDWIN G, DEATHERIDGE J HAROLD, et al. Early-age concrete strength prediction by maturity—another look［J］.ACI Material Journal，1990，87（6）：565-572.［4］SLATNICK SAM,RIDING KYLE A,FOLLIARD KEVIN J,et al. Evaluation of autogenous deformation of concrete at early ages［J］. ACI Materials Journal，2011，108(1)：21-28.［5］应义淼，杨俊杰，陈雄，等. 余震作用下早龄期钢筋混凝土柱裂缝及内部损伤分析［J］.建筑结构，2011,41（3）：72-74.［6］GB/T 50081—2002 普通混凝土力学性能试验方法标准［S］. 北京: 中国建筑工业出版社，2003.［7］过镇海. 钢筋混凝土原理［M］. 北京：清华大学出版社，1999.
