【摘要】 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。更多还原

【Abstract】 Aimed at general style of pier which was applied to highway concrete bridge and acting feature of earthquake,test model and experimental method were designed.Firstly,low-cycle fatigue test which inclued four stages was carried out.Four steps of low-cycle loading were set in accordance with elastical cracking phase,yielding phase,and two phases after yielding.After low-cycle loading,static push-over tests and axial compression tests of the damaged columns were carried out.Damage state,horizontal load-deformation and residual bearing capacity of column piers under iterative loading were studied.Based on the work mentioned in above,effects of shear-span ratio,axial load ratio and longitudinal reinforcement ratio on damaged state of reinforced concrete columns were analyzed.Results show that the degeneration of horizontal bearing capacity of the column is significantly influenced by horizontal low-cycle fatigue effect after low-cycle loading,while the degeneration of vertical bearing capacity is little influenced by it.Research conclusions can provide theoretical support for evaluation and reinforcement of bridge after seism.更多还原