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为了研究地震作用下钢筋混凝土剪弯构件的损伤性能,依据试验结果统计分析了剪弯构件的残余变形与循环位移、割线刚度损伤的关系,建立了剪弯构件的低周疲劳变形计算公式。在此基础上,探讨了剪弯构件的割线刚度、抗力衰减规律,分析了剪跨比、轴压比和纵筋、箍筋配筋率等参数对构件残余变形的影响,提出了考虑低周疲劳效应的剪弯构件极限变形折减系数计算公式。结果表明,计算值与试验值的相对误差处于合理范围之内,验证了该方法的可靠性和实用性,可为震后桥梁性能评估提供理论支持。
In order to study the damage behavior of reinforced concrete members under earthquake, the relationship between residual deformation and cyclic displacement and the secant rigidity of the members is analyzed statistically based on the test results. The formulas for calculating low-cycle fatigue deformation of the members are established. On the basis of this, the secant rigidity and the law of the decay of the resistance of the members are discussed, and the influences of the span ratio, the axial compression ratio, the reinforcement ratio of the longitudinal reinforcement and the stirrup on the residual deformation of the members are analyzed. Calculation formula of the ultimate deformation reduction factor of the shear - bending members under the cyclic fatigue effect. The results show that the relative error between the calculated value and the experimental value is within a reasonable range, which verifies the reliability and practicability of the proposed method, which can provide theoretical support for the post-earthquake bridge performance assessment.