竖向配预应力钢筋混凝土桥墩抗震性能研究综述

Review of studies on seismic behavior of prestressed reinforced concrete bridge piers

竖向配预应力筋钢筋混凝土桥墩(PRC桥墩)在桥梁工程中具有广阔的应用前景。总结了PRC桥墩产生以来国内外学者的主要研究成果,并对其抗震能力进行了系统的归纳和分析,主要包括预加压力、预应力筋用量、预应力度、预应力筋位置等因素对PRC桥墩残余变形、屈服后侧向刚度、水平承载力、耗能能力等抗震性能的影响。表明预应力筋的配置可有效减少残余变形、控制裂缝发展,并提高结构的屈服后刚度。PRC桥墩中的普通纵筋是保证桥墩延性耗能能力的关键,但配筋率应保持在合理范围内。

Vertically prestressed reinforced concrete （PRC） bridge piers have a wide application prospect in bridge engineering. Based on the review of the researches on seismic behavior of PRC bridge piers at home and abroad, some important findings on the seismic behavior of PRC bridge piers were introduced and summarized, including the influence of prestressing force, the amount and location of prestressing tendon and the prestressing ratio on the residual deformation, the lateral stiffness after yielding, horizontal carrying capacity and energy dissipation capacity of the PRC bridge piers. It is found that the prestressing tendon would reduce the residual deformation, delay the concrete cracking development and improve the lateral stiffness of the pier after yielding. The longitudinal reinforcement plays an important role in the energy dissipation capacity of the pier, ensuring the ratio of reinforcement in a reasonable range.