【摘要】："屈服點"是工程結(jié)構研究和設計中一個極為關鍵的性能點,是衡量延性、屈強比等性能的前提,但在當前結(jié)構設計中尚缺少統(tǒng)一的定義。隨著新型結(jié)構材料的不斷出現(xiàn),新的構件行為也在不斷出現(xiàn),作圖法、等能量法、殘余塑性變形法等確定屈服點的方法不能適用。該文首先從材料層次基于金屬單軸拉伸屈服點的定義,給出了金屬、混凝土和纖維增強復合材料等典型材料的屈服點定義的統(tǒng)一表述;再從構件和結(jié)構層次,基于應用條件與物理本質(zhì),明確了屈服點的定義方法,為新型材料構件、結(jié)構設計提供了依據(jù),并對鋼筋混凝土梁和短柱使用此方法進行了討論。此外,還建議采用"最遠點法"確定構件和結(jié)構的屈服點,該方法具有明確的物理含義,且適用性廣、適合于電算。通過分析構件和結(jié)構的試驗結(jié)果表明建議的屈服定義和提出的最遠點法具有一致性和合理性,從而從基本原理和定義方法上明確了材料、構件和結(jié)構屈服點。
[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.
【作者單位】： 清華大學土木工程系;
【基金】：國家自然科學基金項目(51522807,51478246)
【分類號】：TU31

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