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为了研究活性粉末混凝土连续梁的塑性性能,制备了5根钢筋活性粉末混凝土两跨连续梁,完成了单跨单点加载试验.考察了试验梁在加载过程中的开裂、中支座控制截面受拉纵筋屈服、跨中控制截面受拉纵筋屈服和极限破坏状态等阶段的受力特征,基于试验结果提出了在设计用承载能力极限状态和真实承载能力极限状态下的中支座两侧等效塑性铰长度计算公式,以及以中支座控制截面相对塑性转角和中支座相对受压区高度为自变量的弯矩调幅计算公式.
In order to study the plastic properties of continuous concrete beams with reactive powder concrete, five reinforced concrete beams with two span were fabricated and the single-span single-point loading test was completed. The cracking of the test beam during loading was investigated. The yield characteristics of the longitudinal reinforcement yielding and the ultimate failure state of the cross-section control cross-section were proposed based on the experimental results. Based on the test results, two sides of the middle support in the limit state of ultimate bearing capacity and the ultimate bearing capacity Equivalent plastic hinge length calculation formula, as well as the mid-bearing control section relative plastic angle and the mid-bearing relative compression zone height as an independent variable of the moment modulation formula.