津保矮塔斜拉桥设计若干问题的探讨

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摘要研究目的：拟建津保铁路子牙河特大桥在跨越天津市外环西青道立交桥和外环河时，为满足立交要求并追求较好的景观效果，主桥上部结构类型采用有砟轨道( 84 +56 +32) m 矮塔斜拉桥。本文着重对斜拉桥结构体系、主桥结构尺寸、支座布置方案、拉索锚固系统等进行优化比选，使该桥达到结构受力合理、视觉效果优美的目的。

研究结论：(1) 本桥选择塔墩梁刚结的结构体系，该方案的优点是结构刚度大，整体性能较好。(2) 增设辅助墩后，结构的整体刚度提高了20%，斜拉索规格减小了16%。经综合比较，在大里程侧增设一个辅助墩。(3) 主梁结构尺寸优化比选时，方案8 的优化效果明显，为本桥的推荐方案。(4) 经综合比选，选择横向两支座体系方案。(5) 分丝管索鞍具有较多优点，更适用于高速铁路桥梁的要求，本桥推荐采用分丝管形式。

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	吴大宏
	宋顺忱
	张雷
	徐平伟

关键词 ：桥梁设计, 津保铁路, 矮塔斜拉桥

Abstract：Research purposes:In order to meet the needs of interchange and gain a good landscape effect，a ballasted short tower cable － stayed bridge with span arrangement of ( 84 + 56 + 32) m is adopted in the proposed Zi Yahe super major bridge on Tianjin － Baoding railway when crossing the flyover bridge in Xi Qingdao Street in the outer ring of Tianjin and the surrounding river． In order to get a reasonable design in mechanics and a good landscape effect，the paper mainly focuses on the optimization and selection of the key characters of the cable － stayed bridge such as structure system，structural dimensions，bearing layout plan，the cable anchorage system and so on．

Research conclusions: (1) The structure system of tower pier and beam consolidation was selected．The advantage of this scheme is its bigger stiffness and better overall performance．(2) By adding a connection pier，the overall stiffness of the structure increased by 20% ，and the dimensions of the cables reduced by 16% ． After a comprehensive comparison，an auxiliary pier is added on the large mileage side． ( 3) When structural dimensions of the main beam were optimizaed and selected，the scheme 8 has the best performance and is recommended for this bridge．(4) After a comprehensive comparison，the transverse two － support system plan is selected．(5) The wire pipe saddle is recommended for the bridge because it has more advantages and is more suitable for the requirements of high － speed railway bridge．

Key words： bridge designing Tianjin － Baoding railway short towers cable － stayed bridge

收稿日期: 2012-05-21

PACS:

U448.27

作者简介: 吴大宏，1975 年出生，男，高级工程师

引用本文:

吴大宏;宋顺忱;张雷;徐平伟. 津保矮塔斜拉桥设计若干问题的探讨[J]. 铁道工程学报, 2012, 29(10): 52-56.
WU Da － hong，SONG Shun － chen，ZHANG Lei，XU Ping － wei. Research on Several Problems in Designing the Short Tower Cable － stayed Bridge on Tianjin － Baoding Railway. 铁道工程学报, 2012, 29(10): 52-56.

链接本文:

http://tdgcxb.crec.cn/CN/ 或 http://tdgcxb.crec.cn/CN/Y2012/V29/I10/52

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