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对锈蚀钢筋混凝土梁的延性特征展开研究,结合48根梁(32根锈蚀梁和12根对比试验梁)的试验数据,在平截面假定不再成立的前提下,回归分析得出不同锈蚀程度的梁在钢筋屈服和极限状态时钢筋与混凝土的应变关系,通过此应变关系得到锈蚀梁在钢筋屈服和极限状态时受压区高度的计算表达式,从而得到了锈蚀梁曲率延性系数的计算模型;根据计算模型,绘制不同锈蚀程度梁的M-φ曲线,并分析了不同锈蚀程度梁的延性变化特征及原因。
The ductility characteristics of corroded RC beams are studied. Based on the experimental data of 48 beams (32 corroded beams and 12 RC beams), the regression analysis shows that the corroded RC beams have different degrees of corrosion The strain relation between steel bar and concrete under the yield and ultimate state of the bar is obtained. The calculation formula of the curvature ductility coefficient of the corroded beam is obtained through calculating the expression of the height of the compression zone when the steel bar is yielding and the ultimate state. According to the calculation model, the M-φ curves of beams with different corrosion degrees are plotted, and the ductile characteristics and causes of beams with different corrosion degrees are analyzed.