Performance Evaluation of RC Beams Strengthened with an Externally Bonded FRP System under Simulated Vehicle Loads
Performance Evaluation of RC Beams Strengthened with an Externally Bonded FRP System under Simulated Vehicle Loads
复制标题
模拟车辆荷载下外粘 FRP 系统加固 RC 梁的性能评估
DOI：
10.1061/(asce)be.1943-5592.0000324
复制
发表时间：
2013-01-01
影响因子：
3.6
通讯作者：
Harries, Kent A.
中科院分区：
文献类型：
--
作者：
Wang, Wen-Wei;Dai, Jian-Guo;Harries, Kent A.
碳纤维增强聚合物（CFRP）片材可用于加固现有RC桥梁梁/桥面。本研究的目的是调查是否瞬态车辆荷载存在于安装过程中的碳纤维布的影响之间的碳纤维布和混凝土基板的粘结性能，因此，随之而来的加固效果。共8个RC梁进行了测试。两个未加强的参考梁，五个加强与CFRP布，而受到瞬态载荷，和最后的梁加强与CFRP布，而只受到持续的静态载荷。试验参数包括瞬态荷载幅值、碳纤维布锚固长度和加固比。瞬态载荷持续2天（在CFRP固化期间），然后对所有5根CFRP加固RC梁进行四点弯曲试验直至失效。将试验结果与参考梁和加固梁的试验结果进行了比较。结果表明，1-Hz的正弦瞬态载荷在未加固梁的极限承载力的30%和50%之间变化，在安装和固化的CFRP片材不影响CFRP加固RC梁的结构性能。这一结果表明了纤维增强聚合物（FRP）加固技术的适用性桥梁，受到连续的车辆荷载。DOI：10.1061/（ASCE）BE.1943-5592.0000324。(C)2013年美国土木工程师协会。
Carbon fiber-reinforced polymer (CFRP) sheets can be used to strengthen existing RC bridge girders/decks. The objective of this study is to investigate whether transient vehicle loads present during the installation of CFRP influence the bond performance between the CFRP and the concrete substrate and, therefore, the consequent strengthening effect. A total of eight RC beams were tested. Two were unstrengthened reference beams, five were strengthened with CFRP sheets while subject to transient loads, and the final beam was strengthened with CFRP sheets while subject to only a sustained static load. The test parameters included the amplitude of the transient load, the anchorage length of the CFRP sheets, and the reinforcing/strengthening ratio. The transient loads were continued for 2 days (during CFRP cure) before all five CFRP-strengthened RC beams were tested to failure in four-point flexure. The test results were compared with those of the reference beams and the one strengthened under a sustained load. It was shown that a 1-Hz sinusoidal transient load varying between 30 and 50% of the ultimate capacity of the unstrengthened beam during the installation and curing of the CFRP sheets does not affect the structural performance of CFRP-strengthened RC beams. This result demonstrates the applicability of the fiber-reinforced polymer (FRP) strengthening technique for bridge girders that are subjected to continuous vehicle loads. DOI: 10.1061/(ASCE)BE.1943-5592.0000324. (C) 2013 American Society of Civil Engineers.