不锈钢钢筋混凝土桥墩冲击性能试验研究

发布时间：2018-06-20 08:16

本文选题：不锈钢钢筋 + 桥墩横向冲击　；参考：《广东工业大学》2015年硕士论文

【摘要】：不锈钢材料有着良好的抗腐蚀性能,对提高结构的使用寿命和减少结构在全寿命使用周期内的维护费用有着重要作用。随着经济和基本建设的发展,越来越多的结构尤其是重要的桥梁结构,开始采用不锈钢钢筋取代普通钢筋。目前对于不锈钢钢筋混凝土结构的研究主要集中在其抗腐蚀性及静力性能上,而对其冲击性能的研究鲜见报道。本文的主要研究内容和成果如下：1.通过设置落锤高度改变小车撞击速度,获得不同冲击能量作用下不锈钢钢筋混凝土桥墩的动态响应,主要包括小车冲击力时程曲线、桥墩位移时程曲线、不锈钢钢筋和混凝土的应变响应及其裂缝的衍生及开展。2.试件不同位置的能量-位移峰值曲线表现为相似的变化规律,通过拟合,得出冲击能量和位移峰值之间的二次函数关系及冲击力峰值与能量变化之间的关系曲线。3.利用有限元软件ANSYS LS-DYNA建立数值分析模型,计算结果与试验结果的符合较好。4.通过对数值模拟冲击试验进行拓展分析,得到横向冲击作用下不锈钢钢筋混凝土桥墩的应力分布,其高应力区域主要集中在接触面局部区域和桥墩墩身底部两个位置。
[Abstract]:Stainless steel has good corrosion resistance and plays an important role in improving the service life of the structure and reducing the maintenance cost of the structure in the whole life cycle. With the development of economy and capital construction, more and more structures, especially important bridge structures, begin to use stainless steel bar instead of ordinary steel bar. At present, the research of stainless steel reinforced concrete structure is mainly focused on its corrosion resistance and static performance, but the research on its impact performance is rarely reported. The main contents and results of this paper are as follows: 1. The dynamic response of the stainless steel reinforced concrete pier under different impact energy is obtained by changing the impact speed of the vehicle by setting the drop weight height, which mainly includes the time-history curve of the impact force of the trolley, the displacement time-history curve of the pier. Strain response of stainless steel bar and concrete and its crack derivation and development. 2. 2. The curve of energy-displacement peak is similar to that of the specimen at different positions. By fitting, the quadratic function relationship between shock energy and displacement peak and the curve between the peak value of impact force and the change of energy are obtained. The finite element software ANSYS LS-DYNA is used to establish a numerical analysis model, and the calculated results are in good agreement with the experimental results. The stress distribution of stainless steel reinforced concrete pier under transverse impact is obtained through the expansion analysis of numerical simulation impact test. The high stress region is mainly located in the local area of contact deck and the bottom of pier body.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.22

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