预应力CFRP布加固混凝土梁受弯试验  

Bending Test of Concrete Beams Strengthened with Prestressed CFRP Sheets

作　　者：于玲[1] 王泽鹏 任成明 包龙生[1] 王宇[3] YU Ling;WANG Zepeng;REN Chengming;BAO Longsheng;WANG Yu(School of Transportation and Geomatics Engineering,Shenyang Jianzhu University,Shenyang,China,110168;Liaoning Province Highway Survey and Design Company,Shenyang,China,110000;School of Civil Engineering,Shenyang Jianzhu University,Shenyang,China,110168)

机构地区：[1]沈阳建筑大学交通与测绘工程学院,辽宁沈阳110168 [2]辽宁省公路勘测设计公司,辽宁沈阳110000 [3]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2024年第2期241-249,共9页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金面上项目(52078309);沈阳市科技计划项目(23-407-3-19)。

摘　　要：目的 研究不同加固方法下预应力碳纤维布加固混凝土梁的受弯性能,解决桥梁加固缺陷的问题。方法 制作了5根试验梁,其中一根为对比梁,不做任何加固处理,其余4根分别采用不同的锚固方式、不同的初始张拉力及不同的加固位置进行加固,通过控制变量,进行加载试验,分析其受弯性能的差异。结果 经加固后的试验梁承载能力与刚度明显增加,与对比梁相比,极限荷载分别提升了25%、22.06%、30.78%及36.76%;各试验梁达到屈服荷载时,经加固的试验梁挠度均小于对比梁产生的挠度,且模腔自锁式锚具锚固的试验梁挠度小于穿孔式自锁锚具锚固的试验梁挠度,相同锚固方法下初始张拉力较大的试验梁挠度要小于初始张拉力较小的试验梁挠度。结论 使用预应力碳纤维布加固混凝土梁能够有效提高混凝土梁的抗弯性能,提升效果与加固位置、锚固方式及初始张拉力大小有关。Researching the flexural performance of prestressed carbon fiber-reinforced polymer(CFRP)strengthened concrete beams involves exploring various reinforcement methods to address deficiencies in bridge reinforcement.In the experimental phase,five test beams were created.One of these served as a reference beam without any reinforcement treatment.The remaining four beams underwent reinforcement using different anchoring methods,various initial prestressing forces,and different reinforcement positions.Through meticulous control of variables,loading tests were conducted to scrutinize differences in flexural performance.The results were noteworthy.Post-reinforcement,the test beams demonstrated a significant increase in load-bearing capacity and stiffness.In comparison to the reference beam,ultimate loads increased by 25%,22.06%,30.78%,and 36.76%,respectively.When reaching the yield load,deflections of the reinforced test beams were consistently less than those of the reference beam.Furthermore,the deflection of the test beam anchored with the cavity self-locking anchorage system was smaller than that of the test beam anchored with the perforated self-locking anchorage system.Within the same anchoring method,the deflection of the test beam with a larger initial prestressing force was consistently smaller than that of the test beam with a smaller initial prestressing force.In conclusion,the application of prestressed carbon fiber-reinforced polymer for the reinforcement of concrete beams proves effective in enhancing flexural performance.The extent of improvement is intricately linked to factors such as the reinforcement position,anchoring method,and the magnitude of the initial prestressing force.

关 键 词：预应力碳纤维布 桥梁加固 受弯试验 缠绕自锁式锚具 

分 类 号：TU375.1[建筑科学—结构工程]