钢管混凝土系杆拱桥拱脚一致多尺度建模及分析

发布时间：2018-02-24 18:28

本文关键词： 钢管混凝土系杆拱桥拱脚弹性边界一致多尺度模型有限元分析　出处：《江苏大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：针对传统精细化模型在分析钢管混凝土系杆拱桥拱脚时,存在局部边界模拟困难、分析精度难以保证等问题,基于结构一致多尺度建模理论,提出将全桥模型通过合理的连接方式统一到拱脚精细化模型上的思路,建立了适用于钢管混凝土系杆拱桥拱脚受力性能分析的一致多尺度建模方法,并对一座计算跨径96 m、矢跨比为1/5的下承式钢管混凝土系杆拱桥的拱脚受力性能和安全性进行了研究.研究结果表明:一致多尺度建模在极大地减小了计算量的同时,还可以准确模拟钢管混凝土系杆拱桥等复杂结构的局部边界条件,并预测拱脚构造的力学行为;钢管混凝土系杆拱桥拱脚结构总体受力合理,但在预应力钢筋锚固区及支座附近区域存在较为明显的应力集中现象.
[Abstract]:In view of the difficulty of local boundary simulation and the difficulty of ensuring the precision of the traditional fine model in analyzing the arch foot of concrete-filled steel tubular tied arch bridge, the model is based on the uniform multi-scale modeling theory. The idea of unifying the whole bridge model to the refined arch foot model by reasonable connection mode is put forward, and a uniform multi-scale modeling method suitable for the analysis of the mechanical behavior of arch foot of concrete-filled steel tubular tied arch bridge is established. The mechanical behavior and safety of a through concrete filled steel tubular tied arch bridge with a calculated span of 96 m and a rise-to-span ratio of 1/5 are studied. The results show that the uniform multi-scale modeling greatly reduces the calculation cost. The local boundary conditions of complicated structures such as concrete-filled steel tubular tied arch bridges can be accurately simulated and the mechanical behavior of arch foot structures can be predicted. But there is obvious stress concentration phenomenon in the Anchorage area of prestressed steel bar and near the support.
【作者单位】：长安大学公路学院;
【基金】：国家自然科学基金资助项目(50808019) 国家留学基金委资助项目(201606560011)
【分类号】：U448.225

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