预应力织物增强砂浆加固钢筋混凝土梁抗弯性能的试验研究

Experimental Study of Flexural Behavior of Reinforced Concrete Beam Strengthened with Prestressed Textile-Reinforced Mortar.

作者信息

Park Jongho, Park Sun-Kyu, Hong Sungnam

机构信息

Department of Civil, Architectural and Environmental System Engineering, Sungkyunkwan University, Suwon 16419, Gyeonggi-do, Korea.

Department of Ocean Civil Engineering, Gyeongsang National University, Tongyeong 53064, Gyeongsangnam-do, Korea.

出版信息

Materials (Basel). 2020 Mar 4;13(5):1137. doi: 10.3390/ma13051137.

DOI:10.3390/ma13051137

PMID:32143407

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7084956/

Abstract

In this study, nine specimens were experimentally tested to analyze the strengthening efficiency of textile-reinforced mortar (TRM) and the difference in flexural behavior between prestressed and non-prestressed TRM-strengthened reinforced concrete beam. The test results show that TRM strengthening improves the flexural strength of TRM-strengthened reinforced concrete beams with alkali-resistant-(AR-) glass textile as well as that with carbon textile. However, in the case of textile prestressing, the strengthening efficiency for flexural strength of the AR-glass textile was higher than that of the carbon textile. The flexural stiffness of AR-glass textiles increased when prestressing was introduced and the use of carbon textiles can be advantageous to reduce the decreasing ratio of flexural stiffness as the load increased. In the failure mode, textile prestressing prevents the damage of textiles effectively owing to the crack and induces the debonding of the TRM.

摘要

在本研究中，对九个试件进行了试验测试，以分析纺织增强砂浆（TRM）的加固效率以及预应力和非预应力TRM加固钢筋混凝土梁在弯曲性能上的差异。试验结果表明，TRM加固提高了用耐碱（AR）玻璃纤维织物以及碳纤维织物加固的钢筋混凝土梁的抗弯强度。然而，在织物预应力的情况下，AR玻璃纤维织物对抗弯强度的加固效率高于碳纤维织物。引入预应力时，AR玻璃纤维织物的抗弯刚度增加，使用碳纤维织物有利于降低荷载增加时抗弯刚度的降低率。在破坏模式方面，织物预应力有效地防止了由于裂缝导致的织物损坏，并引发了TRM的脱粘。