郑万铁路上跨郑西客专联络线特大桥主桥转体结构分析

发布时间：2018-01-11 05:26

本文关键词：郑万铁路上跨郑西客专联络线特大桥主桥转体结构分析　出处：《铁道标准设计》2017年05期 　论文类型：期刊论文

【摘要】：郑万铁路上跨郑西客专联络线特大桥为主跨138 m独塔斜拉桥,该桥位于半径1 400 m曲线上,采用国内最大横向偏心球铰(偏心距0.847 m),其可靠性与稳定性对保证施工安全至关重要。基于空间有限元软件Midas FEA分析转体结构在施工过程中的局部应力分布,并研究预应力筋对转体结构力学性能的影响。结果表明:(1)转体结构整体处于较低的应力状态,局部存在应力集中,可通过构造措施保证其力学性能;(2)预应力筋的配置可大幅减小由于局部承压而产生的拉应力,确保转体施工中上下转盘的结构安全;(3)通过设置预偏心,实现了转体施工在大跨度小曲线斜拉桥上的成功运用,降低了桥面配重和转体重力。上述研究成果可为同类型桥梁转体施工提供重要借鉴。
[Abstract]:Zheng Wan railway cross bridge Zhengxi Passenger Dedicated Line Contact 138 m main span single tower cable-stayed bridge, the bridge is located in a radius of 1400 m curve, the largest transverse eccentric ball joint (eccentricity 0.847 m), the reliability and stability is very important to ensure the safety of construction. The space finite element software Midas FEA swivel structure analysis in the construction process based on the local stress distribution, and effects of prestressed bars on the swivel structure mechanical properties. The results showed that: (1) the whole swivel structure in low stress state, the local stress concentration, which can guarantee the mechanical properties by structural measures; (2) tendons configuration can significantly due to local pressure decreases the tensile stress, ensure the safety of the structure in the upper and lower rotary Swivel Construction; (3) by setting the eccentricity, the swivel construction in large span cable-stayed bridge on the small curve of the successful application, with lower deck The results of the above research can provide an important reference for the construction of the same type of bridge.

【作者单位】：郑万铁路客运专线河南有限责任公司;
【分类号】：U445.4
【正文快照】： 1概述(图1)郑万铁路上跨郑西客专联络线特大桥位于郑州市经济技术开发区,主要为跨越石武、郑西客运专线、107国道、南三环等控制点而设,其中主桥与郑西客运专线夹角17°。主桥设计速度160 km/h,为单线有砟轨道铁路桥。综合考虑桥梁方案的合理经济跨度[1-4]、施工风险[5]及净空

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