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采用ABAQUS非线性有限元分析方法,分析了预应力度、有效预应力、预应力筋反弯点长度与线形、含钢率及截面相对受压区高度等因素对预应力型钢混凝土框架梁弯矩调幅系数的影响。研究表明:预应力度、含钢率及截面相对受压区高度对预应力型钢混凝土框架梁弯矩调幅系数影响较显著,随着预应力度、截面相对受压区高度的降低及含钢率的增加,弯矩调幅系数增大;预应力筋的有效预应力、预应力筋反弯点长度与线形的变化可以改变框架梁次弯矩,从而对框架梁弯矩调幅系数产生影响。通过对弯矩调幅系数的分析,建议预应力度λ不宜大于0.6,经济合理含钢率为5%左右,截面相对受压区高度不宜大于0.32。
The ABAQUS nonlinear finite element analysis method is used to analyze the influence of prestressing force, effective prestressing force, the length and the line shape of the anti-bending point of prestressing tendons, the steel content and the relative bearing height of the cross-section on the bending moment of prestressed steel reinforced concrete frame beams Effect of amplitude modulation coefficient. The results show that the prestressing force, the steel content and the relative compression zone height have a significant influence on the moment modulation AM coefficient of prestressed steel reinforced concrete frame beams. With the decrease of prestressing force, the decrease of the relative compression zone height and the steel content The effective moment of prestressing tendons, the length of bending point of prestressing tendons and the change of linear shape can change the moment moment of frame beam, which will affect the moment modulation coefficient of frame beam. According to the analysis of the moment modulation index, it is suggested that the prestressing strength λ should not be greater than 0.6, the economically reasonable steel content is about 5%, and the relative compression zone height should not be greater than 0.32.