预应力碳纤维板加固锈损钢梁抗弯性能试验研究
张宗星1，3，徐宇轩1，秦广冲2，徐善华3，彭圣元3

(1.中国矿业大学 力学与土木工程学院，江苏 徐州 221116; 2.中国船舶重工集团国际工程有限公司，北京 100121; 3.西安建筑科技大学 土木工程学院，陕西 西安 710055)

CFRP板; 预应力; 锈损; 钢梁; 抗弯性能

Experimental study on bending resistance of corroded steel beams strengthened with prestressed carbon fibre plate
ZHANG Zongxing1,3, XU Yuxuan1, QIN Guangchong2, XU Shanhua3, PENG Shengyuan3

(1.School of Mechanics and Civil Engineering, China University of Mining & Technology, Jiangsu Xuzhou, 221116, China; 2.China Shipbuilding Industry Corporation International Engineering Co., Ltd., Beijing 100121, China; 3.School of Civil Engineering, Xi'an Univ. of Arch. & Tech., Xi'an 710055, China)

CFRP plate; prestress; rust loss; steel beam; bending strength

DOI: 10.15986/j.1006-7930.2023.04.015

备注

通过碳纤维增强复合材料(Carbon fiber reinforced composites, CFRP)加固锈损钢梁抗弯性能试验,研究不同预应力度CFRP板对锈损钢梁破坏模式及抗弯承载力的影响,揭示CFRP板加固锈损钢梁受拉区对提升其正截面承载力的作用机理,探讨CFRP板加固锈损钢梁界面粘结应力分布规律.结果表明:试件破坏模式均为跨中粘结界面剪切破坏后CFRP板的撕裂,且CFRP板断裂位置大多在加载点.锈损钢梁破坏后CFRP板产生5～10 mm的纵向滑移.粘结剪应力主要分布在CFRP板端部区域,且剪应力最大值在加载点处.15%fu预应力水平CFRP板可以将锈损钢梁承载力提升23.26%,达到未锈蚀状态时的承载力,同时提高CFRP板的利用率高达71.59%.
Through the flexural performance test of rusty steel beams strengthened with carbon fiber reinforced composite(CFRP), the effects of different prestressing degrees of CFRP plates on the failure modes and bending capacity of rusty steel beams are studied, the mechanism of tensile zone of corroded steel beam strengthened with CFRP plates to enhance its normal section bearing capacity is revealed, and the distribution of the interfacial stress of corroded steel beam strengthened with CFRP plates is discussed. The test results show that the failure modes of the specimens are the tear of the CFRP plate after the shear failure of bonding interface on the mid span, and the fracture location of the CFRP plate is mostly at the loading point. After the destruction of the damaged steel beam, the longitudinal slip of 5～10 mm is generated on the CFRP plate. The shear stress is mainly concentrated on the end of CFRP, and the peak value of shear stress appears at the loading point. 15%fu prestressed CFRP plate can increase the bearing capacity of the corroded steel beam by 23.26%, reaching the bearing capacity in the non-corroded state, and improve the utilization rate of CFRP plate by up to 71.59%.