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汶川特大地震后,交通运输部颁布了新的《公路桥梁抗震设计细则》,采用了两水平设防,两阶段设计的抗震设计理念,由单一的强度设计修改为由强度和变形等多指标控制的抗震设计方法。但是,对于现役钢筋混凝土桥墩而言,如何通过科学的抗震加固方法来增加其变形能力乃是提高我国整体桥梁结构抗震水平的关键。采用新型材料PUFA材料,对现役钢筋混凝土桥墩进行了抗震加固设计。为了验证其抗震加固效果,利用OpenSees软件对每个加固模型分别进行了PUSHOVER数值解析,并与常用的混凝土加大截面法和粘贴碳纤维加固法的加固效果进行分析比较。研究结果表明:利用PUFA进行抗震加固不仅可以切实提高钢筋混凝土桥墩的韧性,而且比常规的抗震加固方法具有更好的抗震加固效果。
After the Wenchuan earthquake, the Ministry of Transport promulgated a new “Code for Design of Aseismic Design of Highway Bridges” and adopted the seismic design concept of two-level fortification and two-stage design, which was changed from a single strength design to a multi-index control of strength and deformation Seismic design method. However, for the existing reinforced concrete piers, how to increase the deformation capacity through the scientific seismic strengthening method is the key to improve the seismic resistance of the whole bridge structure in our country. Using the new material PUFA material, the existing reinforced concrete piers are designed for seismic strengthening. In order to verify the aseismic reinforcement effect, PUSHOVER numerical analysis of each reinforcement model was carried out by using OpenSees software, and compared with commonly used reinforced concrete section method and reinforcement effect of carbon fiber reinforcement method. The results show that the seismic strengthening of PUFA can not only effectively improve the toughness of reinforced concrete piers, but also have better seismic strengthening effect than conventional seismic strengthening methods.