悬索桥铰销式CFRP环带吊索试验及参数分析  

Experiment and parameter analysis of pin-loaded CFRP strap suspenders for suspension bridge

作　　者：潘艳阳 高婧[1] 龚晨晓 刘五瑞 徐恭义 PAN Yanyang;GAO Jing;GONG Chenxiao;LIU Wurui;XU Gongyi(School of Architecture and Civil Engineering,Xiamen University,Xiamen 361005,China;Xiamen Carbonking Composite Technology Co.Ltd.,Xiamen 361021,China;China Railway Bridge Survey and Design Institute Group Co.Ltd.,Wuhan 430050,China)

机构地区：[1]厦门大学建筑与土木工程学院,福建厦门361005 [2]厦门碳帝复合材料科技有限公司,福建厦门361021 [3]中铁大桥勘测设计院集团有限公司,湖北武汉430050

出　　处：《厦门大学学报（自然科学版）》2024年第6期1132-1141,共10页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金联合基金(U2005216);福建省自然科学基金(2020J01010);中国中铁股份有限公司科技研究项目(2020-重点-11)。

摘　　要：[目的]针对碳纤维复合增强材料(CFRP)在桥梁吊索应用中锚固性能差的问题进行研究.[方法]提出了一种铰销式CFRP环带吊索,进行铰销式CFRP环带的静力拉伸试验,建立ANSYS有限元模型并进行了参数分析,以五峰山大桥为例,建立全桥模型,模拟CFRP环带吊索的全桥替换.[结果]试验结果表明:环带在直线相交处发生脆性断裂,平均断裂应力为直线条带的80%;随着水滴形构件楔角的增加,环带平均断裂应力逐渐增大,且增幅逐渐减小;数值模拟结果与试验结果一致,随着环带层数、水滴形构件楔角、摩擦系数的改变,环带各层不同位置的应力均出现不同程度的变化,其中曲线段及其相邻直线段的应力应变分布情况受参数变化的影响更大,对环带的承载力有较大影响;全桥替换前后的桥梁的静动力特性变化较小.[结论]本文提出的铰销式CFRP环带吊索表现出良好的力学性能,在全桥应用中展现了可行性,并有效解决了传统CFRP索锚固性能差的问题.[Objective]As critical load-bearing members in suspension bridges,traditional bridge suspenders are usually made of steel.However,steel suspenders are subjected to corrosion,creep and other issues,causing premature failures of the suspender system and additional maintenance costs of the bridge.Carbon fiber reinforced polymer(CFRP)materials exhibit high strength-to-weight ratio,corrosion resistance,fatigue resistance,ease of installation and reduced maintenance costs.Hence,they have become a potential substitute for steel materials.In bridge suspenders,CFRP materials are mostly shaped into the form of rods,and this formation leads to the problem of anchoring.Also,the unidirectional arrangement of fibers weakens the transverse shear resistance of the cable,thus further complicating the solution of CFRP-cable anchoring problems.[Methods]In this paper,a pin-loaded CFRP strap suspender was proposed.In this strap suspender,CFRP prepregs with continuous unidirectional fibers were wound by layers around two pins,which facilitated the load transfer.Static tensile experiments were performed to investigate the load-bearing capacity and failure mode of pin-loaded CFRP straps.Through the finite-element analysis software ANSYS,a finite-element model was developed,and parametric analyses were performed on strap layers,wedge angle,and friction coefficient.Based on these experimental and parametric-analysis results,a whole bridge model was established,with an example of the Wufengshan Bridge.[Results]CFRP strap was made of unidirectional fiber wound by layers,and thus indured weak interlaminar shear strength.In the static tensile experiments,with the increase of load,the strap appeared delamination at the intersection of straight lines,accompanied by the emergence of transverse cracks.With the delamination and transverse cracks propagated to the curved segment and straight segment,brittle fracture occurred in the strap at the intersection of straight lines.The scanning electron microscope(SEM)images showed that the fiber fracture

关 键 词：复合材料 CFRP环带 数值模拟 参数分析 全桥模型 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]