Flexural behaviors of steel reinforced ECC/concrete composite beams  

钢筋增强高延性ECC/混凝土组合梁的受弯性能(英文)

作　　者：董洛廷[1] 潘金龙[1] 袁方[1] 梁坚凝[2] 

机构地区：[1]东南大学混凝土及预应力混凝土教育部重点实验室,南京210096 [2]香港科技大学土木及环境工程学系,中国香港999077

出　　处：《Journal of Southeast University(English Edition)》2012年第2期195-202,共8页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No. 50808043);the National Basic Research Program of China (973 Program) (No. 2009CB623200);Foundation of Jiangsu Key Laboratory of Construction Materials,Program for Special Talents in Six Fields of Jiangsu Province(No. 2011-JZ-010)

摘　　要：An engineered cementitious composite （ECC） is introduced to partially substitute concrete in the tension zone of a reinforced concrete beam to form an ECC/reinforced concrete （RC） composite beam, which can increase the ductility and crack resisting ability of the beam. Based on the assumption of the plane remaining plane and the simplified constitutive models of materials, the stress and strain distributions along the depth of the composite beam in different loading stages are comprehensively investigated to obtain calculation methods of the load-carrying capacities for different stages. Also, a simplified formula for the ultimate load carrying capacity is proposed according to the Chinese code for the design of concrete structures. The relationship between the moment and curvature for the composite beam is also proposed together with a simplified calculation method for ductility of the ECC/RC composite beam. Finally, the calculation method is demonstrated with the test results of a composite beam. Comparison results show that the calculation results have good consistency with the test results, proving that the proposed calculation methods are reliable with a certain theoretical significance and reference value.采用高延性纤维增强水泥基材料部分代替钢筋混凝土梁受拉区的混凝土得到 ECC/RC 组合梁构件,可以有效提高梁的延性及抗裂性能. 基于平截面假定和材料本构模型,分析组合梁构件在受力过程中各个阶段的截面应力应变状态,得到各阶段承载力的计算方法. 根据混凝土结构设计规范,提出了 ECC/RC 组合梁极限承载力的简化计算方法,并给出了组合梁构件的弯矩-曲率关系,得到组合梁延性的简便计算方法.最后,采用一个组合梁的试验结果对理论公式进行验征. 结果表明: 计算结果和试验结果吻合得较好,证明所提出的组合梁各阶段受弯承载力计算方法是正确的,具有一定的理论意义和参考价值.

关 键 词：engineered cementitious composites （ECC） reinforced concrete composite beam flexural properties load carrying capacity 

分 类 号：TU354[建筑科学—结构工程]