Experimental study on flexural behavior and failure mechanism of RC beams strengthened with SSWM-PM

被引：0
|
作者：
Huang Q. [1 ,2 ]
Guo Z. [1 ,2 ]
Yao Q. [3 ]
Liu Y. [1 ,2 ]
Lin J. [1 ,2 ]
机构：
[1] College of Civil Engineering, Huaqiao University, Xiamen
[2] Key Laboratory for Structure Engineering and Disaster Prevention of Fujian Province, Xiamen
[3] China Academy of Building Research, Beijing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2019年 / 40卷 / 12期
关键词：
Flexural behavior; Polymer mortar (PM); RC beam; Static test; Steel stranded wire mesh (SSWM); Strengthening;
D O I：
10.14006/j.jzjgxb.2017.0742
中图分类号：
学科分类号：
摘要：
Six RC beams strengthened using steel stranded wire mesh and polymer mortar (SSWM-PM) and one un-strengthened RC beam were constructed and tested to investigate the flexural performance. The main parameters included the reinforcement ratio, type of polymer mortar (PM) and prestress level of stranded wires. Based on the test results, the bearing capacity, deformation, failure modes and failure mechanism of the strengthened specimens were analyzed. The results indicate that the flexural capacity of strengthened specimens increases with the increase of the reinforcement ratio, while the ultimate deformation and ductility of strengthened specimens decrease compared with un-strengthened specimen. The strengthening technique has little influence on the initial stiffness of specimens. The prestress of stranded wires could restrain the crack and reduce the width of cracks, while higher prestress level led to a decrease of the ultimate deformation capacity of specimens under the same reinforcement ratio. The strengthened specimen with a prestress level of 0.05 has satisfactory deformation capacity. In addition, strengthened specimens with two-component PM don't show significant difference in bonding behavior and bearing capacity compared to those with single-component PM. For strengthened specimens with a high reinforcement ratio, the capacity of end anchorage components needs to be checked. Based on the plane-section hypothesis, the design formula of flexural capacity was proposed, and the calculated results agree well with the test results. © 2019, Editorial Office of Journal of Building Structures. All right reserved.
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页码：78 / 87
页数：9
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