ECC全包裹普通混凝土复合试件的力学性能  

Mechanical Properties of Ordinary Concrete Confined with Engineered Cementitious Composites(ECC)

作　　者：康迎杰 郭自利[4] 叶斌斌 潘鹏[4,5] KANG Yingjie;GUO Zili;YE Binbin;PAN Peng(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Innovation Center for Wind Engineering and Wind Energy Technology of Hebei Province,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,Tsinghua University,Beijing 100084,China)

机构地区：[1]石家庄铁道大学省部共建交通工程结构力学行为与系统安全国家重点实验室,石家庄050043 [2]河北省风工程和风能利用工程技术创新中心,石家庄050043 [3]石家庄铁道大学土木工程学院,石家庄050043 [4]清华大学土木工程系,北京100084 [5]清华大学土木工程安全与耐久教育部重点实验室,北京100084

出　　处：《材料导报》2024年第3期104-109,共6页Materials Reports

基　　金：国家重点研发计划(2019YFC1907204)。

摘　　要：为综合利用工程用水泥基复合材料(ECC)在力学性能上和普通混凝土在成本上的优势,本工作提出了一种制备ECC全包裹普通混凝土复合试件的方法,通过进行抗压、抗拉及抗弯等试验系统研究了其基本力学性能,并采用数值分析方法对配筋复合梁进行了正截面受弯性能研究。结果表明:在复合试件受力破坏时,ECC和混凝土界面未出现滑移,两种材料黏结可靠实现了协同受力;相对普通混凝土试件而言,复合试件的抗压强度、抗拉强度及抗弯强度均有所提升,尤其是抗弯强度的提升最为显著,对于截面尺寸为100 mm×100 mm的梁,当ECC厚度分别为10 mm和15 mm时,抗弯强度可提高27.4%和57.1%;复合试件具有良好的延性变形能力,破坏后可保持一定的完整性,整体具备高韧性特征;与普通钢筋混凝土梁相比,配筋复合梁有效利用了ECC材料的性能优势,显著提升了配筋梁的承载和变形能力。Composite specimens of ordinary concrete confined with engineered cementitious composites(ECC)were prepared,considering the comprehensive utilization of the advantage of ECC in mechanical properties and the low price of ordinary concrete.Tests of compressive,tensile,and flexural were carried out,and the basic mechanical properties of composite specimens were systematically studied.The bending behavior of reinforced composite beams was also studied by numerical analysis method.The results show that the interface between ECC and concrete did not slip when the composite specimen was damaged by force,and the two materials bonded reliably to achieve synergistic stresses.Compared with ordinary concrete specimens,the compressive strength,tensile strength and flexural strength of composite specimens are improved,especially the flexural strength are most significantly improved.For the beam with a section of 100 mm×100 mm,the flexural strength is increased by 27.4%and 57.1%respectively,when the thickness of ECC is 10 mm and 15 mm.The composite specimen has considerable ductile deformation ability,and can maintain a certain integrity after failure,so it has the characteristics of high toughness.Compared with ordinary reinforced concrete beams,reinforced composite beams can take advantage of the performance advantages of ECC to significantly improve the bearing and deformation capacity.

关 键 词：工程用水泥基复合材料 复合试件 力学性能 延性破坏 高韧性 

分 类 号：TU528.1[建筑科学—建筑技术科学]