腐蚀劣化对波形钢腹板组合箱梁疲劳特性的影响  

Effect of Corrosion Deterioration on Fatigue Characteristics of Corrugated Steel Web Composite Box Girders

作　　者：湛馥全 ZHAN Fuquan(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070

出　　处：《兰州工业学院学报》2024年第6期24-30,共7页Journal of Lanzhou Institute of Technology

摘　　要：为研究分析波形钢腹板组合箱梁因腐蚀劣化对其疲劳特性的影响,基于断裂力学理论,利用Python编写计算腐蚀疲劳裂纹扩展剩余寿命的计算程序,通过计算不同初始蚀坑深度、不同疲劳荷载下和有无腐蚀条件下波形钢腹板组合箱梁的疲劳寿命来分析腐蚀损伤程度、疲劳荷载以及腐蚀劣化对波形钢腹板组合箱梁疲劳特性的影响。结果表明:波形钢腹板组合箱梁的疲劳寿命主要集中在小裂纹阶段;相同疲劳荷载下结构初始蚀坑深度为0.5 mm的疲劳寿命是初始蚀坑为2 mm的1.9倍左右,腐蚀损伤程度增大造成结构的疲劳特性降低;相同初始蚀坑深度下,疲劳应力幅从23.8 MPa增加到33.8 MPa时,结构疲劳寿命降低了56.9%,疲劳荷载增大造成结构的疲劳特性降低;在相同疲劳荷载下,存在腐蚀条件时结构疲劳寿命普遍要低于无腐蚀介质时的疲劳寿命,且低了70.4%左右,腐蚀劣化导致了结构疲劳特性严重降低。In order to study and analyze the influence of corrosion deterioration on the fatigue characteristics of corrugated steel web combined box girder,based on the theory of fracture mechanics,Python is used to write a calculation program for calculating the residual life of corrosion fatigue crack extension,and the fatigue life of the corrugated steel web combined box girder with different initial pits depths,different fatigue loads,and the fatigue life of corrugated steel web combined box girder with or without corrosion is calculated to analyze the influence of the degree of corrosion damage,fatigue load,and corrosion deterioration on the fatigue characteristics of the corrugated steel web combined box girder.The study shows that the fatigue life of corrugated steel web composite box girder is mainly concentrated in the small crack stage;the fatigue life of the structure under the same fatigue load with an initial pitting depth of 0.5 mm is about 1.9 times that of the initial pitting of 2 mm,and the increase in the degree of corrosion damage results in a decrease in the fatigue characteristics of the structure;the fatigue life of the structure decreases by 56.9%when the fatigue stress amplitude increases from 23.8 MPa to 33.8 MPa for the same initial etch pit depth,and the fatigue characteristics of the structure decrease due to the increase in fatigue loading;under the same fatigue load,the fatigue life of the structure in the presence of corrosive conditions is generally lower than that of the fatigue life in the absence of corrosive media,and roughly about 70.4%lower,corrosion deterioration has led to a serious reduction in the fatigue characteristics of the structure.

关 键 词：波形钢腹板组合箱梁 腐蚀劣化 疲劳特性 疲劳寿命 

分 类 号：TU599[建筑科学—建筑技术科学]