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| Research on Several Problems in Designing the Short Tower Cable － stayed Bridge on Tianjin － Baoding Railway |
| WU Da － hong，SONG Shun － chen，ZHANG Lei，XU Ping － wei |
| The Third Railway Survey and Design Institute Group Corporation，Tianjin 300142，China |
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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．
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Received: 21 May 2012
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2012, Vol. 29 
