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自复位桥梁墩柱结构通过将无粘结预应力钢筋与耗能钢筋有效结合成整体受力,很好地改善传统桥墩在横向地震荷载过后具有较大不易恢复残余变形的特点,并且同时保证足够的耗能能力。该文阐述了自复位桥梁墩柱结构的基本力学特点,并以自复位桥梁墩柱结构拟静力试验为参照,考虑桥墩弯曲变形、耗能钢筋无粘结长度以及底部混凝土与钢筋应变差产生的滑移效应,提出了自复位节结构力学分析模型以及有限元模型,并根据混凝土应力简化的不同程度,应用等效矩形应力图法和平截面假定法两种方法求解混凝土压力,从而把握整个结构体系受力特征。此外,该文研究了自复位刚度转换特征,揭示其隔振本质,为结构设计提供参考依据。
The self-resetting bridge pier structure effectively combines the unbonded prestressing steel with the energy-consuming reinforcing bar into a whole force, which can well improve the characteristics of the traditional bridge pier with large and difficult to recover the residual deformation after the lateral earthquake load, and at the same time, ensure sufficient Power consumption. In this paper, the basic mechanics characteristics of self-resetting bridge piers and columns are introduced. Based on the quasi-static test of pier-column self-restoring bridges, considering the bending deformation of piers, the unbonded length of energy-consuming rebar and the strain difference of bottom concrete and rebar The mechanical analysis model and the finite element model of the self-resetting section structure are put forward. According to different degrees of simplification of the concrete stress, two methods of equivalent rectangular stress plane method and flat section assumption method are used to solve the concrete pressure so as to grasp the whole structure System stress characteristics. In addition, this paper studies the characteristics of self-resetting stiffness transformation, reveals the essence of vibration isolation and provides a reference for structural design.