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| Research on the Spatial Analysis of Short Tower Cable － stayed Bridge on Tianjin － Baoding Railway |
| WU Da － hong，WANG Li － zhong，ZHANG Shuai，ZHANG Hai |
| The Third Railway Survey and Design Institute Group Corporation，Tianjin 300142，China |
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Abstract Research purposes:A ballasted track low tower cable － stayed bridge with span arrangement of ( 84+ 56+32) m is adopted in constructing the upper major bridge of the proposed Ziya River，Tianjin － Baoding Railway Bridge．Considering its unsymmetry and complexity，the article focuses on calculating and analysing the spacial statics，the dynamic characteristics，the stability，the cable stress amplitude，the unbalanced cable force，the local stress，the seismic performance，and so on to prove the safety of either whole or partial structure．
Research conclusions: The research shows: (1) Transverse and vertical deformation of the main beam is small，even under the consideration of train load and temperature effect，thus the structure is sufficiently rigid．(2) The stress and intensity safety factor of each section of the main beam are within the limits of the design specification requirements． (3) The strength safety factor of the inclined cable is 2.75 and the anti －slip safety factor of the saddles epoxy mortar on both sides of the divider silk tubes is greater than 3.0，which guarantees enough security．(4) The elastic buckling stability factor of the main structure is greater than 5，which confirms that the structural stability meets the specification requirements．(5) The bridge satisfies the target of seismic design that“A Bridge should be Unruinable in Micro Seism，Repairable in Medium Shock，and does not Fall in Strong Earthquakes”．
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Received: 25 September 2012
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2013, Vol. 30 
