基于有限元的波纹钢腹板组合箱梁疲劳损伤分析

中文摘要: 针对波纹钢腹板组合箱梁（以下简称箱梁）的抗弯性能进行有限元分析，分析箱梁的静力位移、应力和应变结果，建立箱梁破坏损伤机理并得到应力薄弱点。同时，根据有限元分析结果，进行箱梁局部应力应变分析，得到箱梁不同水平下的疲劳寿命。最后，结合疲劳损伤和疲劳断裂理论进行箱梁的疲劳裂纹扩展行为及破坏过程和寿命预测研究，分析了正弦波疲劳荷载作用下箱梁中的钢腹板、PBL剪力连接件以及钢板翼缘等部件的疲劳裂纹萌生及寿命预测结果与试验结果吻合较好。研究表明：根据美国规范AASHTO2004中C类标准进行工程设计和疲劳寿命估算与试验符合较好，同时采用Palmgren-Miner线性累积损伤疲劳准则能有效地计算变幅疲劳载荷下箱梁的疲劳损伤及断裂破坏过程，为实际工程中箱梁疲劳性能设计提供参考。
Abstract:This paper presents a finite element analysis on flexural behaviors of box girders with corrugated steel web (hereafter called box girders). Displacement, stress and strain under static load is used to confirm the failure mechanism and stress weak spots. Meanwhile, fatigue life of box girders in different conditions is predicted by analyzing local stress and strain action, which is acquired by finite element analysis. Based on the fatigue damage and fatigue fracture theory, the predicted results of cracks initiation location and fatigue life are approximately agree with the experimental. Results show that the standard C of America code AASHTO2004 is suitable for designing the fatigue life of box girders, What is more, the Palmgren-Miner learner accumulated damage criterion can be an efficient method to analysis the fatigue damage process, which provides a reference for box girders fatigue design in practical engineering.