钢管混凝土拱桥损伤机理研究

发布时间：2018-01-25 02:59

本文关键词： 钢管混凝土拱桥吊杆有限元分析索力损伤识别固定端长度边界条件　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：在目前发现的拱桥病害中,吊杆病害占绝大部分,这些病害导致拱桥力学性能退化,耐久性降低,使用寿命严重缩短,因此吊杆是既有钢管混凝土拱桥中最重要且易损构件之一。然而吊杆的索力估算,吊杆的损伤识别方法以及吊杆更换准则仍然有许多问题需要讨论。本文通过有限元数值模拟方法结合实桥实测数据,对钢管混凝土拱桥的吊杆轴力影响因素,轴力估算,吊杆损伤识别包括拱桥损伤指标等问题进行了研究。主要研究内容如下： (1)在实桥实测吊杆力数据的基础上,对钢管混凝土拱桥索力计算中影响因素进行了分析,并结合有限元数值方法对计算结果进行了比较与验证。 (2)在对现有索力测定基本原理讨论的基础上,结合吊杆刚度和嵌固端长度的影响,提出了新的索力估算公式,并使用实桥实测数据及ANSYS有限元数值模拟进行了验证。 (3)通过有限元方法对不同损伤工况下钢管混凝土拱桥进行了数值计算,研究了在各个工况下拱桥吊杆与主梁不同程度损伤的损伤指标的变化规律。改进了原有的损伤指标,并对损伤指标的敏感性进行了分析。
[Abstract]:Among the arch bridge diseases discovered at present, crane diseases account for most of them. These diseases lead to the degradation of mechanical properties, the reduction of durability and the shortening of service life of arch bridges. Therefore, the suspender is one of the most important and vulnerable components in the existing concrete-filled steel tubular arch bridge. However, the cable force of the suspender is estimated. There are still many problems to be discussed about the damage identification method and replacement criteria of suspenders. In this paper, the finite element numerical simulation method combined with the measured data of the real bridge is used to influence the axial force of the suspenders of concrete-filled steel tubular arch bridge. The axial force estimation and the damage identification of suspenders including the damage index of arch bridge are studied. The main contents of the study are as follows: 1) based on the measured data of suspension force, the factors influencing the cable force calculation of CFST arch bridge are analyzed, and the results are compared and verified with finite element method. 2) based on the discussion of the basic principle of cable force measurement, a new formula of cable force estimation is put forward combining with the influence of the stiffness of the suspension rod and the length of the fixed end. The real bridge measured data and ANSYS finite element numerical simulation are used to verify the results. 3) numerical calculation of concrete-filled steel tubular arch bridge under different damage conditions is carried out by finite element method. In this paper, the damage indexes of arch bridge suspenders and main girders with different degrees of damage are studied, the original damage indexes are improved, and the sensitivity of damage indexes is analyzed.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22;U441

【参考文献】