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为了深入了解型钢混凝土(SRC)梁的高周疲劳特性,在对其进行疲劳试验研究的基础上,从理论上分析了SRC梁疲劳发展的全过程,并基于疲劳破坏模式提出了表征SRC梁疲劳强度的参数,对疲劳强度进行了评估.研究表明:SRC梁首先在H型钢受拉翼缘处发生疲劳断裂,同时导致梁截面同侧的受拉纵筋屈服,随后受压区混凝土逐渐压酥剥落;通过对SRC梁截面承受的弯矩与其本身确定的几种弯矩的比较分析,阐释了SRC梁在疲劳发展全过程中的行为特征;以H型钢受拉翼缘应力幅作为表征SRC梁疲劳强度的参数,选用国内外钢结构疲劳设计S-N曲线对其疲劳强度进行了评估,建议可基于钢结构疲劳的设计方法来考虑SRC梁的疲劳设计.
In order to understand deeply the high-cycle fatigue characteristics of SRC beam, based on the fatigue test, the whole process of fatigue development of SRC beam is theoretically analyzed. Based on the fatigue failure mode, the fatigue characteristics of SRC beam are proposed The fatigue strength was evaluated.The results show that the SRC beam first fatigue-ruptures at the tension flange of H-beam and at the same time leads to the tension of the tensioned reinforcement at the same side of the beam section, and then the concrete in the compression zone gradually crumbles The characteristics of SRC beams during fatigue development were explained by comparing and analyzing the bending moment of SRC beams and the bending moment of SRC beams. Fatigue strength of the parameters, selection of domestic and foreign steel structure fatigue design SN curve fatigue strength assessment, it is recommended based on the fatigue design of steel structures to consider SRC beam fatigue design.