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进行了不同截面尺寸高强混凝土梁的弯曲试验,研究了梁高对其受弯性能的影响。试件采用C70高强混凝土,纵向受力钢筋采用HRB400级钢筋。试件截面尺寸不同,截面长宽比、剪跨比和配筋率等参数保持一致。分析了不同截面尺寸对高强混凝土梁的名义开裂弯矩、名义屈服弯矩、名义极限弯矩、延性以及塑性转动能力的影响。研究结果表明,高强混凝土梁的名义开裂弯矩、名义屈服弯矩和名义极限弯矩无明显尺寸效应,而试件的位移延性系数和塑性铰区的塑性转动能力则表现出明显的尺寸效应,随截面尺寸的增大梁的位移延性系数和塑性铰区塑性转动能力有所降低。
The bending tests of high-strength concrete beams with different cross-section dimensions were carried out, and the effect of beam height on the bending performance was studied. C70 high-strength concrete specimens were used, longitudinal force reinforced with HRB400 steel. Specimens of different cross-sectional dimensions, section aspect ratio, shear span ratio and reinforcement ratio and other parameters remain the same. The influence of different section sizes on the nominal cracking moment, nominal yield moment, nominal ultimate moment, ductility and plastic rotation of high-strength concrete beams is analyzed. The results show that the nominal cracking moment, the nominal yield moment and the nominal ultimate moment of high-strength concrete beam have no obvious size effect, while the displacement ductility coefficient and the plastic rotation capacity of the plastic hinge area show a significant size effect, With the increase of cross-section size, the displacement ductility coefficient and the plastic rotation capacity of the plastic hinge zone are reduced.