CAJ | 학술논문

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.
채용고연성섬유증강수니기재료부분대체강근혼응토량수랍구적혼응토득도ECC/RC조합량구건,가이유효제고량적연성급항렬성능.기우평절면가정화재료본구모형,분석조합량구건재수력과정중각개계단적절면응력응변상태,득도각계단승재력적계산방법.근거혼응토결구설계규범,제출료ECC/RC조합량겁한승재력적간화계산방법,병급출료조합량구건적만구-곡솔관계,득도조합량연성적간편계산방법.최후,채용일개조합량적시험결과대이론공식진행험정.결과표명:계산결과화시험결과문합득교호,증명소제출적조합량각계단수만승재력계산방법시정학적,구유일정적이론의의화삼고개치.
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.