考虑动水压力的桥墩钢筋锈蚀抗震性能改进模型研究

Improved Model for Seismic Performance of Bridge Piers with Corroded Reinforcement under Hydrodynamic Pressure

摘要:

针对考虑动水压力作用下桥墩内部钢筋锈蚀后抗震力学性能变化规律的问题，通过力学推导和abaqus有限元模拟研究了桥墩的力学性能，首先依托塑性铰区域高度计算公式，构建桥墩动水压力计算简化模型，通过改进有限元计算模型，提出了优化后的考虑钢筋锈蚀的桥墩计算公式。计算结果表明：动水压力作用下桥墩底部钢筋锈蚀与混凝土损伤对桥墩主压应力影响最大，其他区域钢筋锈蚀影响较小，并对桥梁承载力计算公式进行修正，为后期同类工程计算提供了理论依据。

Abstract:

To clarify the seismic performance of bridge piers with corroded reinforcement under the action of hydrodynamic pressure, the mechanical properties of the piers are studied by theoretical derivation and numerical simulation. First, based on the calculation formula of plastic hinge height, a simplified calculation model of the hydrodynamic pressure of bridge piers is constructed. Then, according to the improved finite element model, the optimized calculation formula of piers with corroded reinforcement is proposed. The results show that under the hydrodynamic pressure, the steel bar corrosion and concrete damage at the pier bottom have the greatest effect on the principal compressive stress of the pier, and the reinforcement corrosions at other parts have less effect. The calculation formula of the bridge bearing capacity is corrected, which provides a theoretical basis for the calculation of similar projects.