材料、构件、结构的“屈服点”定义与讨论
发布时间：2018-12-06 17:17
【摘要】："屈服点"是工程结构研究和设计中一个极为关键的性能点,是衡量延性、屈强比等性能的前提,但在当前结构设计中尚缺少统一的定义。随着新型结构材料的不断出现,新的构件行为也在不断出现,作图法、等能量法、残余塑性变形法等确定屈服点的方法不能适用。该文首先从材料层次基于金属单轴拉伸屈服点的定义,给出了金属、混凝土和纤维增强复合材料等典型材料的屈服点定义的统一表述;再从构件和结构层次,基于应用条件与物理本质,明确了屈服点的定义方法,为新型材料构件、结构设计提供了依据,并对钢筋混凝土梁和短柱使用此方法进行了讨论。此外,还建议采用"最远点法"确定构件和结构的屈服点,该方法具有明确的物理含义,且适用性广、适合于电算。通过分析构件和结构的试验结果表明建议的屈服定义和提出的最远点法具有一致性和合理性,从而从基本原理和定义方法上明确了材料、构件和结构屈服点。
[Abstract]:"yield point" is one of the most important performance points in the research and design of engineering structures. It is the premise to measure the ductility and yield ratio. However, there is still a lack of a unified definition in the current structural design. With the continuous emergence of new structural materials, new structural behavior is also emerging, drawing method, equal energy method, residual plastic deformation method and other methods can not be used to determine the yield point. In this paper, based on the definition of uniaxial tensile yield point of metals at the material level, a unified definition of yield point for typical materials, such as metal, concrete and fiber reinforced composites, is presented in this paper. Based on the application conditions and physical essence, the definition method of yield point is defined, which provides a basis for the design of new material members and structures. The use of this method for reinforced concrete beams and short columns is also discussed. In addition, "farthest point method" is suggested to determine the yield point of members and structures. This method has a clear physical meaning and is suitable for computer calculation because of its wide applicability. The experimental results of the components and structures show that the proposed yield definition and the farthest point method proposed are consistent and reasonable, thus the yield points of materials, members and structures are defined from the basic principle and the definition method.
【作者单位】： 清华大学土木工程系;
【基金】：国家自然科学基金项目(51522807,51478246)
【分类号】：TU31
本文编号：2366380
[Abstract]:"yield point" is one of the most important performance points in the research and design of engineering structures. It is the premise to measure the ductility and yield ratio. However, there is still a lack of a unified definition in the current structural design. With the continuous emergence of new structural materials, new structural behavior is also emerging, drawing method, equal energy method, residual plastic deformation method and other methods can not be used to determine the yield point. In this paper, based on the definition of uniaxial tensile yield point of metals at the material level, a unified definition of yield point for typical materials, such as metal, concrete and fiber reinforced composites, is presented in this paper. Based on the application conditions and physical essence, the definition method of yield point is defined, which provides a basis for the design of new material members and structures. The use of this method for reinforced concrete beams and short columns is also discussed. In addition, "farthest point method" is suggested to determine the yield point of members and structures. This method has a clear physical meaning and is suitable for computer calculation because of its wide applicability. The experimental results of the components and structures show that the proposed yield definition and the farthest point method proposed are consistent and reasonable, thus the yield points of materials, members and structures are defined from the basic principle and the definition method.
【作者单位】： 清华大学土木工程系;
【基金】：国家自然科学基金项目(51522807,51478246)
【分类号】：TU31
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