Experimental and numerical study on flexural behaviors of steel reinforced engineered cementitious composite beams  

钢筋增强ECC梁受弯性能的试验及数值研究(英文)

作　　者：蔡景明[1] 潘金龙[1] 袁方[1] 

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

出　　处：《Journal of Southeast University(English Edition)》2014年第3期330-335,共6页东南大学学报（英文版）

基　　金：The National Natural Science Foundation of China(No.51278118);the National Basic Research Program of China(973Program)(No.2009CB623200);the Natural Science Foundation of Jiangsu Province(No.BK2012756)

摘　　要：To investigate the flexural behaviors of steel reinforced engineered cementitious composite （ECC） beams, the behaviors of the steel reinforced ECC beam and the conventional steel reinforced concrete beam subjected to flexural load are experimentally compared. The experimental results show that the flexural strength and ductility of the steel reinforced ECC beam are 24.8% and 187.67% times larger than those of the steel reinforced concrete beam, and the substitution of concrete with ECC can significantly delay the propagation of cracks. Additionally, a simplified constitutive model of the ECC material is used to simulate the flexural behaviors of beams by the finite element analysis （FEA）. The results show a good agreement between the simulation and test results. The crack width of the steel reinforced ECC beam can be limited to 0.4 mm under the service load conditions. The application of ductile ECC can significantly increase the flexural performance in terms of flexural strength, deformation capacity and ductility of the beams.为了研究钢筋增强ECC梁受弯性能,进行了钢筋增强ECC梁和普通钢筋混凝土梁受弯的对比研究.结果表明,相比普通钢筋混凝土梁,钢筋增强ECC梁的受弯承载力和延性分别提高了24.8%和187.76%,并且在梁中用ECC代替混凝土可有效延缓裂缝的发展.此外,采用简化的ECC本构模型对钢筋增强ECC及混凝土梁的受弯性能进行了非线性有限元分析,模拟结果与试验结果吻合较好,在服役期间钢筋增强ECC梁的裂缝可以控制在0.4 mm以下.ECC材料的使用可明显提高梁的抗弯承载力、变形能力、延性等受弯性能.

关 键 词：engineered cementitious composites （ECC） DUCTILITY flexural behavior finite element 

分 类 号：TU375[建筑科学—结构工程]