首页|多因素耦合作用跨海斜拉桥BFRP拉索力学性能及损伤机理研究

多因素耦合作用跨海斜拉桥BFRP拉索力学性能及损伤机理研究

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为了研究多因素耦合作用下跨海斜拉桥玄武岩纤维增强复合材料(basalt fiber reinforced polymer,BFRP)拉索的长期服役性能,通过调研我国跨海斜拉桥所处典型地区的海洋气候环境,分析了跨海斜拉桥BFRP拉索长期服役性能的关键影响因素.基于IEC(international electrotechnical commission)多因子耐久试验方法,并结合我国跨海斜拉桥的实际服役环境,提出了一种跨海斜拉桥BFRP拉索的预应力-紫外线-湿热-降水-盐雾多因素耦合耐久性试验方法.基于多因素耦合耐久性试验方法,开展了跨海斜拉桥BFRP拉索的多因素耦合耐久性试验及基本力学性能测试,分析了多因素耦合作用下BFRP拉索的力学性能退化规律,并通过微观结构分析阐述了多因素耦合作用下BFRP拉索的损伤失效机理.实验结果表明:多因素耦合作用能够显著加速BFRP拉索力学性能的退化,且早期性能下降明显,温度对其性能退化的加速作用较大,BFRP拉索弹性模量下降幅度较小且无明显规律.多因素耦合作用主要通过损伤纤维/树脂界面影响BFRP拉索力学性能的退化.
Mechanical property and damage mechanism study of BFRP cables on cross-sea cable-stayed bridge under multi-factor coupled action
Basalt fiber reinforced polymer(BFRP)cables provide an effective way to construe the cross-sea ca-ble-stayed bridges with high performance,long life and light weight,due to their superior mechanical and chemi-cal properties,such as the high strength-to-weight ratio,anti-corrosion properties,fatigue-resistance and high-cost performance.To investigate the long-term service performance of BFRP cables of cross-sea cable-stayed bridges under multi-factor coupled effects,this paper summarizes the key factors affecting the long-term service performance of BFRP cables of cross-sea cable-stayed bridges according to an in-depth investigation of the marine climate environment in typical coastal areas of China.Based on International Electrotechnical Commission(IEC)multi-stress test procedure and service environment of cross-sea cable-stayed bridges,a new method for multi-fac-tor coupled durability test of BFRP cables was proposed(Prestress-Ultraviolet-Temperature-Humidity Cycles-Precipitation-Salt Fog coupled durability test).Based on the proposed method,the multi-factor coupled durabili-ty tests and basic mechanical properties tests of BFRP cable were conducted.According to the test results,the degradation behavior of mechanical properties of the BFRP cables was analyzed.And the damage and failure mechanism of BFRP cable under multi-factor coupled action were expounded by the microstructure analysis.The results of this study indicate that the multi-factor coupled action can significantly accelerate the degradation of the basic mechanical performance.And the mechanical performance properties decline more pronounced during the early stage.Compared with other factors,the temperature plays a bigger role in accelerating the performance deg-radation.The elastic modulus of BFRP cable under multi-factor coupled action decreases slightly without distinct regularity.The microstructure of the BFRP cables shows that the multi-factor coupled action has an influence on the mechanical degradation through damaging the interface between the fiber and the matrix.

long-span cable-stayed bridgeBFRP cablesmulti-factor coupled durabilityperformance degrada-tiondamage failure

杨亚强、周姊娴、管彦林、徐丹、沈浩、蒋宗豪

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江苏科技大学土木工程与建筑学院,镇江 212100

跨海斜拉桥 BFRP拉索 多因素耦合耐久性 性能退化 损伤失效

国家自然科学基金资助项目江苏省高等学校自然科学研究面上资助项目山东省重点研发资助项目江苏省研究生科研与实践创新计划项目江苏省研究生科研与实践创新计划项目江苏省研究生科研与实践创新计划项目江苏省研究生科研与实践创新计划项目

5180826518KJB5600052019GSF111013SJCX24_2548SJCX24_2556KYCX24_4135KYCX24_4138

2024

10.20061/j.issn.1673-4807.2024.04.010

江苏科技大学学报(自然科学版)
江苏科技大学

江苏科技大学学报(自然科学版)

影响因子：0.373
ISSN：1673-4807
年,卷(期)：2024.38(4)