新型高铁双肋钢桁拱桥结构特点和受力性能

发布时间：2018-03-26 22:10

本文选题：高速铁路　切入点：新型钢桁拱桥　出处：《铁道科学与工程学报》2014年01期

【摘要】：DPSD桥是一座新建双线高速铁路新型大跨连续钢桁拱桥,边跨跨度只有中跨的1/3左右。基于该桥的结构特点,进行全桥空间有限元和关键节点的局部精细有限元分析。研究结果表明:这种"双拱肋+下弦杆+边纵梁"的结构,弥补了边跨太小的缺点,桥梁整体刚度大,静活载作用下的挠跨比为1/2 344;下弦杆只受节点荷载,受力状态简单;一部分桥面荷载由边纵梁传至横梁,改善了桥面系和横梁的受力状态,桥梁的整体受力满足强度要求;桁拱关键节点的节点板边缘采用不同的曲线较光滑相连,尽管形状不规则,但应力集中程度较小,节点局部受力均处于弹性状态。该新型结构用于中、边跨跨度之比3以上的大跨度铁路桥是合适的。
[Abstract]:The DPSD Bridge is a new type of long-span continuous steel truss arch bridge of a new double-track high-speed railway. The span of the side span is only about one third of the middle span. The spatial finite element analysis of the whole bridge and the local fine finite element analysis of the key nodes are carried out. The results show that this kind of "double arch rib chord side longitudinal beam" structure makes up for the disadvantage of too small side span, and the overall stiffness of the bridge is large. The ratio of deflection to span under static and live load is 1 / 2344; the lower chord is only subjected to the node load, and the loading state is simple; part of the bridge deck load is transferred from the side longitudinal beam to the cross beam, which improves the stress state of the bridge deck system and the beam, and the overall force of the bridge meets the strength requirement. The joint plate edge of key joints of truss arch is connected by different curves. Although the shape is irregular, the stress concentration is small, and the local stress of the joints is in elastic state. A long span railway bridge with a ratio of 3 to 3 is suitable.
【作者单位】：中南大学土木工程学院;
【基金】：铁道部科技开发计划资助项目(2008G007-B)
【分类号】：U448.22;U441

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