大长细比钢管混凝土拱长期静力性能分析

发布时间：2018-02-10 19:38

本文关键词： 钢管混凝土拱桥徐变收缩静力性能简化计算法　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：作为一种新兴的现代桥梁结构形式，钢管混凝土拱桥因其承载力高、跨越能力强、施工效率高、外型美观等优点在跨度70m 500m的桥梁中具有较强的竞争力。虽然钢管混凝土拱桥的应用日益广泛，但目前对钢管混凝土拱各项力学性能的认识尚不深入，限制了该类桥型的发展。钢管混凝土拱的长期静力性能虽然得到了学术界的广泛关注，但现有研究主要针对特定的桥梁开展，且相关试验数据较少，不足以指导设计，需要进行更加深入系统的研究。本文利用ABAQUS有限元模型，对两端固结的圆形截面钢管混凝土抛物线单拱肋长期静力性能开展参数分析，考虑参数包括：含钢率、长细比、加载龄期、持荷时间，其范围根据钢管混凝土拱桥实际设计参数统计结果确定，，研究在0.5倍极限承载力的持荷作用下，核心混凝土时效作用对不同参数的钢管混凝土拱长期挠度与截面应力分布情况的影响，研究发现，拱肋核心混凝土时效作用对钢管混凝土拱长期静力性能影响显著，且随拱肋参数的不同有较大差异。在此基础上，基于ABAQUS有限元模型，以保证拱肋屈曲前出平面位移相同为原则，通过调整拱肋初始缺陷，建立一种可以考虑核心混凝土时效作用影响的钢管混凝土拱承载力极限状态出平面稳定性能简化分析方法。由于无风撑钢管混凝土拱的长细比较大，拱肋在发生失稳时截面材料基本未进入塑性，因此采用增加拱肋初始缺陷的方式考虑核心混凝土时效作用对钢管混凝土拱出平面稳定承载力的影响具有可行性。将该简化方法的分析结果与课题组前期建立的较为精确的分析方法的分析结果进行对比，验证简化计算方法的可靠性。最后进行钢管混凝土拱长期静力性能试验方案的设计与加工准备工作，用于研究核心混凝土时效作用对钢管混凝土拱长期挠度、截面应力分布及出平面稳定性能的影响。
[Abstract]:As a new type of modern bridge structure, concrete filled steel tube arch bridge has high bearing capacity, strong span ability and high construction efficiency. Although the application of concrete-filled steel tubular arch bridge is more and more extensive, the understanding of the mechanical properties of concrete filled steel tube arch is not deep enough at present. Although the long-term static behavior of concrete-filled steel tubular arch has been widely concerned by academia, but the existing research is mainly focused on specific bridges, and there are few experimental data, which is not enough to guide the design. More in-depth and systematic research is needed. In this paper, the ABAQUS finite element model is used to analyze the long-term static behavior of concrete-filled steel tubular concrete (CFST) single arch rib with circular section. The parameters include steel ratio, aspect ratio, loading age, loading time, and so on. The range is determined by the statistical results of actual design parameters of concrete-filled steel tube arch bridge. Under the action of 0.5 times ultimate bearing capacity, The effect of core concrete aging on the long-term deflection and section stress distribution of concrete-filled steel tube arch with different parameters is studied. It is found that the effect of core concrete aging on the long-term static performance of concrete filled steel tube arch is significant. Based on the ABAQUS finite element model and the principle of ensuring the same plane displacement before buckling of arch rib, the initial defects of arch rib are adjusted. A simplified analysis method for the ultimate state of bearing capacity of concrete-filled steel tubular arch (CFST) is established, which can take into account the effect of aging effect of core concrete. Because the length and fineness of CFST arch without wind brace is large, When the arch rib is unstable, the material of section is basically not plastic. Therefore, it is feasible to consider the effect of core concrete aging on the bearing capacity of concrete filled steel tube arch plane by increasing the initial defects of arch rib. The results of more accurate analysis methods are compared. The reliability of the simplified calculation method is verified. Finally, the design and processing preparation of the long-term static behavior test scheme of concrete-filled steel tubular arch is carried out, which is used to study the long-term deflection of concrete filled steel tube arch under the core concrete aging action. The influence of the stress distribution of the cross section and the stability of the exit plane.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.22

【参考文献】