CFRP约束再生混凝土桥墩抗震性能及生态效益研究  

Research on Seismic Performance and Ecological Benefits of CFRP Confined Recycled Concrete Piers

作　　者：赵振宇 宋帅 田震 王彦龙 张雪凝 Zhao Zhenyu;Song Shuai;Tian Zhen;Wang Yanlong;Zhang Xuening(Department of Civil Engineering,Qingdao University of Technology,Qingdao 266520,Shandong,China)

机构地区：[1]青岛理工大学,土木工程学院,山东青岛266520

出　　处：《震灾防御技术》2024年第4期736-746,共11页Technology for Earthquake Disaster Prevention

基　　金：国家自然科学基金(51808376);中国博士后科学基金(2019M651076);山东省自然科学基金(ZR2021ME094)。

摘　　要：随着大规模基础设施的建设及自然资源的逐步匮乏,再生混凝土逐渐应用到桥梁工程结构中。相对普通混凝土桥墩,再生混凝土桥墩的抗震性能偏弱。将碳纤维复合材料(CFRP)与再生混凝土相结合可提升桥墩的抗震性能。通过对普通混凝土柱、再生混凝土柱及CFRP约束再生混凝土柱进行拟静力试验及数值模拟研究,结果表明,再生混凝土柱经碳布包裹后最大承载力及位移延性系数分别提高了18.8%和2.2%,达到了普通混凝土柱的水平。CFRP约束再生混凝土柱具有更大的初始刚度与残余刚度,累计总耗能量较再生混凝土柱提高28.1%。通过对碳布缠绕层数和缠绕高度的合理设置可提高再生混凝土柱的性能,从而达到和普通混凝土柱性能相近的目的。对CFRP约束再生混凝土柱的生态效益研究表明,CFRP约束再生混凝土柱其制备产生的二氧化碳总量比普通混凝土柱降低4.3%。CFRP约束再生混凝土桥墩的抗震性能及生态效益优于普通混凝土桥墩,因此具有一定的应用前景。With the development of large-scale infrastructure and the growing scarcity of natural resources,recycled concrete is increasingly being used in bridge engineering.However,recycled concrete piers generally exhibit weaker seismic performance compared to conventional concrete piers.To enhance their seismic performance,carbon fiber reinforced polymer(CFRP)materials are applied to reinforce recycled concrete.Through quasi-static tests and numerical simulations on ordinary concrete columns,recycled concrete columns,and CFRP-confined recycled concrete columns,the results indicate that recycled concrete columns wrapped with carbon fiber cloth exhibit an 18.8%increase in maximum bearing capacity and a 2.2%increase in displacement ductility,reaching the performance level of ordinary concrete columns.CFRP-restrained recycled concrete columns also demonstrate greater initial and residual stiffness,with a cumulative total energy dissipation 28.1%higher than that of recycled concrete columns without CFRP.By optimizing the number of CFRP layers and wrapping height,the seismic performance of recycled concrete columns can be further improved to match that of conventional concrete columns.Furthermore,an analysis of the ecological benefits reveals that the carbon dioxide emissions associated with the production of CFRP-confined recycled concrete columns are 4.3%lower than those of ordinary concrete columns.Overall,CFRP-restrained recycled concrete bridge piers offer superior seismic performance and ecological benefits compared to conventional concrete piers,demonstrating promising potential for practical applications.

关 键 词：桥梁工程 约束再生混凝土 碳纤维复合材料 抗震性能 生态效益 

分 类 号：U44[建筑科学—桥梁与隧道工程]