基于耗散能密度的钢筋混凝土梁桥疲劳剩余寿命研究
发布时间：2019-06-04 12:13
【摘要】：我国部分早期建设桥梁服役年限已经超过20 a,随着车流量逐年增加钢筋混凝土桥梁疲劳损伤问题日益突显。主要预测钢筋混凝土桥梁剩余寿命,首先基于耗散能密度角度针对桥梁疲劳原理加以分析;然后结合能量平衡方程及傅里叶定律推倒得出了疲劳损伤能耗控制方程;最后对算例桥梁主要杆件进行了疲劳损伤分析得到杆件201与杆件202测点疲劳损伤值最大为10.92E-15与9.20E-15,根据ADAMS软件仿真计算得出结论在车辆密集运行状态下受压区钢筋混凝土应力幅集中在1 MPa以下,按照1.2万辆车日通行量前提下计算得到一般运营状态下桥梁疲劳寿命为60 a,密集状态下疲劳寿命为10 a。
[Abstract]:The service life of some early bridges in China has exceeded 20 years, and the fatigue damage of reinforced concrete bridges is becoming more and more prominent with the increase of traffic flow year by year. The residual life of reinforced concrete bridge is predicted. Firstly, the fatigue principle of reinforced concrete bridge is analyzed based on the angle of dissipative energy density, and then the energy consumption control equation of fatigue damage is obtained by combining energy balance equation and Fourier law. Finally, the fatigue damage analysis of the main members of the bridge is carried out, and it is found that the maximum fatigue damage values of the main members of the bridge are 10.92E-15 and 9.20E 鈮，
本文编号：2492715
[Abstract]:The service life of some early bridges in China has exceeded 20 years, and the fatigue damage of reinforced concrete bridges is becoming more and more prominent with the increase of traffic flow year by year. The residual life of reinforced concrete bridge is predicted. Firstly, the fatigue principle of reinforced concrete bridge is analyzed based on the angle of dissipative energy density, and then the energy consumption control equation of fatigue damage is obtained by combining energy balance equation and Fourier law. Finally, the fatigue damage analysis of the main members of the bridge is carried out, and it is found that the maximum fatigue damage values of the main members of the bridge are 10.92E-15 and 9.20E 鈮，
本文编号：2492715
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