Fatigue life assessment of FRP cable for long-span cable-stayed bridge

作     者：Feng, Bo Wang, Xin Wu, Zhishen 

作者机构：Southeast Univ Minist Educ Key Lab C&PC Struct Nanjing 210096 Jiangsu Peoples R China Southeast Univ Int Inst Urban Syst Engn Nanjing 210096 Jiangsu Peoples R China Southeast Univ Natl & Local Unified Engn Res Ctr Basalt Fiber Pr Nanjing 210096 Jiangsu Peoples R China 

出 版 物：《COMPOSITE STRUCTURES》 (复合材料结构)

年 卷 期：2019年第210卷

页      面：159-166页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Key Research and Development Plan [2017YFC0703000] National Natural Science Foundation of China [51678139, 51878149] 

主　　题：Cable-stayed bridge Long-span FRP cable Combined algorithm Fatigue life assessment 

摘      要：This study evaluates fatigue life of carbon fiber reinforced polymer (CFRP), basalt fiber reinforced polymer (BFRP) and steel cables considering the sag effect for cable-stayed bridges with various safety factors. The fatigue cycles of the cables during designed service period were first studied by an analysis of vehicle load statistics. The least favorable cables and their stress amplitudes were determined by finite element (FE) analysis. Fatigue life assessment based on the design stress and service life of the cable was conducted by developing the combined algorithm of equivalent transformation. The results indicate that the cables in the bridge undergo approximately up to 1.14 x 10(9) fatigue cycles during 100 service years. The most unfavorable cable is the one in the mid-span position, and its equivalent stress amplitude is almost 12 times the actual stress amplitude. The fatigue life of CFRP cables increases much faster than that of BFRP and steel cables with increasing of safety factor. The fatigue lives of CFRP and BFRP cables are 3 and 1A times, respectively, compared to that of a steel cable with the safety factor of 2.55. To satisfy 100 years of design life, safety factor of CFRP, BFRP and steel cables should be no less than 2.55, 3.27 and 3.64, respectively.