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针对当前公路混凝土桥梁中普遍采用的柱式桥墩的典型情况和地震作用形式,设计了试验模型和试验方法。首先进行了低周疲劳试验,低周循环分为4个阶段,分别为弹性开裂阶段、屈服阶段和2类屈服后阶段。然后在循环完成后分别进行静力推倒和轴心受压破坏试验,研究了柱式桥墩模型在反复荷载作用下的损伤发展以及循环完成后的承载能力和变形能力,并分析了剪跨比、轴压比和纵筋配筋率等对钢筋混凝土柱损伤发展的影响。结果表明:水平低周疲劳效应对钢筋混凝土柱水平承载力的降低影响较大,对轴压承载力影响较小。研究结论可为震后桥梁性能评估、加固提供理论支持。
Aiming at the typical situation and seismic action form of column piers commonly used in highway concrete bridges, experimental models and test methods are designed. The low-cycle fatigue test was carried out firstly. The low-cycle was divided into four stages: elastic cracking stage, yield stage and post-yielding stage. Then, after the completion of the cycle, the static collapse test and the axial compression failure test were respectively carried out. The damage development of the column piers under repeated load and the carrying capacity and deformation capacity after the completion of the cycle were studied. The effects of shear span ratio, Effect of axial compression ratio and longitudinal reinforcement ratio on the damage development of reinforced concrete columns. The results show that the horizontal low cycle fatigue effect has a great effect on the decrease of horizontal bearing capacity of reinforced concrete columns and has little effect on the bearing capacity of the axial compression. The conclusion of the study can provide theoretical support for the assessment and reinforcement of post-earthquake bridge performance.