Abstract

In a concrete-filled steel tube (CFST), dry shrinkage and creep produce a circumferential gap between the inner concrete core column and outer steel tube that is increased by harsh weather in cold regions. Thermomechanical coupling finite element analysis was performed to determine the temperature fields, stresses, and strains of CFST arch bridge ribs with circumferential gaps. A traction–separation law was developed for cohesive elements of the steel–concrete interface, which was applied to a parametric analysis on the CFST temperature field and stresses according to diameter. The results can help guide maintenance strategies for CFST arch bridges.

中文翻译：

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恶劣天气环境下温度对钢管混凝土拱桥肋的影响

摘要

在钢管混凝土 (CFST) 中，干缩和蠕变会在内部混凝土芯柱和外部钢管之间产生周向间隙，该间隙会因寒冷地区的恶劣天气而增加。进行热机械耦合有限元分析以确定具有圆周间隙的CFST拱桥肋的温度场、应力和应变。为钢-混凝土界面的粘性单元开发了牵引-分离定律，并将其应用于CFST温度场和根据直径的应力的参数分析。研究结果有助于指导钢管混凝土拱桥的维护策略。