车辆荷载作用下波纹钢腹板箱梁疲劳性能分析

发布时间：2019-04-24 12:31

【摘要】：当今桥梁向大跨径发展的趋势十分明显,而波纹钢腹板梁由于能显著减轻桥梁上部结构的重量,完美解决PC箱梁混凝土腹板开裂的问题,增强了桥梁的跨越能力,因此在出现的几十年间得到了快速的发展。由于桥梁不断受到车辆荷载、风荷载等活荷载的作用,交通量不断增大,屡禁不绝的货车客车超载现象,以及不断增大的桥梁跨径等因素,都会增加波纹钢腹板组合箱梁桥在运营期内发生疲劳破坏的可能性。因此有必要对在车辆荷载作用下的波纹钢腹板组合箱梁的疲劳性能进行研究。论文通过参考各国学者对波纹钢腹板钢梁、组合梁的相关理论分析及疲劳试验结果,结合国内外钢桥及组合梁桥规范对结构抗疲劳验算的相关规定,选取了合适的疲劳车、交通量及疲劳构造细节等级,运用有限元分析软件对邢台紫金波纹钢腹板组合箱梁桥运营期内的疲劳损伤及寿命进行了评估:桥梁120年的运营期内,在英国规范标准疲劳车、参考文献中推荐的标准疲劳车、中国公路规范550kN重车分别作用下,各构造细节的累积疲劳损伤度D值都远远小于1,认为桥梁在运营期不会发生疲劳破坏,具有无限长疲劳寿命。论文通过参考波纹钢腹板实桥的跨中横截面形式及波纹形状,采用有限元分析软件建立了简支波纹钢腹板箱梁桥实体模型。通过改变腹板波纹的几何参数,例如腹板的倾斜角度、型号、高度等,研究几何参数变化对其疲劳性能的影响,最后提出了改善其疲劳性能的方法。研究发现波纹钢腹板倾斜角度及腹板厚度对其疲劳性能的影响最大,疲劳性能随波纹钢腹板倾斜角度的增大而降低,随腹板厚度的增大而提高。腹板的高度对疲劳性能有一定的影响,采用不同的波纹钢腹板型号对其疲劳性能的影响不显著。
[Abstract]:Nowadays, the development trend of bridge to long span is very obvious, and the corrugated steel web beam can reduce the weight of bridge superstructure remarkably, solve the cracking problem of concrete web of PC box girder perfectly, and enhance the span ability of bridge. As a result, the emergence of decades of rapid development. Because the bridge is constantly subjected to live loads such as vehicle load, wind load and so on, the traffic volume is increasing constantly, the overloading phenomenon of truck and bus, and the increasing span of bridge, and so on. It will increase the possibility of fatigue failure of corrugated steel web composite box girder bridge during operation. Therefore, it is necessary to study the fatigue behavior of corrugated steel web composite box girder under vehicle load. By referring to the relevant theoretical analysis and fatigue test results of corrugated steel webs and composite beams by scholars from all over the world, combined with the relevant provisions of domestic and foreign steel bridges and composite beam bridge codes for structural fatigue checking, a suitable fatigue vehicle is selected. The fatigue damage and life of Xingtai Zijin corrugated steel web composite box girder bridge during operation are evaluated by using finite element analysis software. The fatigue damage and life of Xingtai Zijin corrugated steel composite box girder bridge during the operation period of 120 years is evaluated by using the finite element analysis software: during the 120 years operation period of the bridge, the fatigue vehicle is standardized in the United Kingdom. Under the action of China Highway Code 550kN heavy car, the cumulative fatigue damage degree D value of each structure detail is far less than 1. It is considered that the bridge will not occur fatigue damage during the operation period, and the fatigue damage degree D value of each structure detail is far less than 1, according to the standard fatigue vehicle recommended in the reference. It has infinite fatigue life. In this paper, the solid model of simply supported corrugated steel web box girder bridge is established by referring to the shape and shape of the middle cross section of corrugated steel web bridge and the finite element analysis software is used to establish the solid model of simply supported corrugated steel web box girder bridge. By changing the geometric parameters of web ripple, such as the inclination angle, type and height of the web, the influence of geometric parameters on the fatigue performance of the web is studied. Finally, the method to improve the fatigue performance of the web is put forward. It is found that the tilting angle and web thickness of corrugated steel web have the greatest influence on its fatigue properties. The fatigue performance decreases with the increase of web inclination angle and increases with the increase of web thickness. The height of the web has a certain effect on the fatigue performance, and the influence of different corrugated steel web type on the fatigue performance is not significant.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.4

【参考文献】