钢管混凝土桁架T型管疲劳寿命数值模拟分析  

Numerical Simulation Analysis of Fatigue Life of T-shaped Tube of Concrete-filled Steel Tube Truss

作　　者：胡俊 宁晓骏[1] Hu Jun;Ning Xiaojun(School of Civil Engineering and Architecture,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,昆明650500

出　　处：《科技通报》2024年第11期103-109,共7页Bulletin of Science and Technology

摘　　要：为分析钢管混凝土桁架T型管的疲劳寿命与管径比α之间的关系,本文以Midas/Civil建立钢管混凝土桁式拱桥有限元模型,通过求解得到极限疲劳荷载,定义疲劳荷载因子β为加载疲劳荷载与极限疲劳荷载的比值,利用ANSYS建立不同管径比的焊接T型管模型。通过实验获取钢管和混凝土的S-N曲线,结合Miner线性疲劳损伤理论,对T型管在轴压作用下的疲劳寿命进行对比分析。研究结果表明:在拱桥处易受疲劳损伤,应重点关注拱脚处的疲劳问题;疲劳寿命随着疲劳荷载的增大而减小;在相同疲劳荷载因子下,管径比为0.6时的疲劳寿命最大。因此,研究结果为钢管混凝土桁架焊接T型管的设计提供了对管径选择的一定参考,有助于提高钢管混凝土桁架结构的安全性、可靠性和经济性。In order to analyze the relationship between fatigue life and pipe diameter ratioαof T-shaped tube of concrete-filled steel tube truss,a finite element model of concrete-filled steel tube truss arch bridge was established based on Midas/Civil,and the ultimate fatigue load was obtained by solving it.The fatigue load factorβwas defined as the ratio of loading fatigue load and ultimate fatigue load.The welded T-tube model with different diameter ratio was established by ANSYS.The S-N curves of steel pipe and concrete were obtained through experiments,and the fatigue life of T-tube under axial pressure was compared and analyzed by Miner linear fatigue damage theory.The results show that the arch bridge is vulnerable to fatigue damage,and the fatigue at the arch foot should be paid more attention;The fatigue life decreases with the increase of fatigue load;under the same fatigue load factor,the maximum fatigue life is obtained when the diameter ratio is 0.6.Therefore,the research results provide a certain reference for the design of welded T-shaped pipe of concrete filled steel tube truss,and help to improve the safety,reliability and economy of concrete filled steel tube truss structure.

关 键 词：钢管混凝土拱桥 疲劳损伤 有限元分析 疲劳寿命 管径比 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]