摘要
研究目的:拟建津保铁路子牙河特大桥主桥上部结构采用有砟轨道(84+56+32)m矮塔斜拉桥,鉴于该桥的不对称性和受力复杂等特点,本文旨在通过空间静力计算、动力特性分析、稳定性分析、拉索应力幅以及不平衡索力计算、局部应力分析、抗震性能分析等,以验证该桥在整体结构及局部构造上的安全可靠性。研究结论:(1)在列车荷载及温度作用下,主梁横、竖向变形较小,结构具有足够的刚度;(2)主梁各截面的应力及强度安全系数均在设计规范要求的限值之内;(3)斜拉索的强度安全系数为2.75,分丝管索鞍两侧环氧砂浆抗滑移安全系数大于3.0,具有足够的安全性;(4)主体结构弹性屈曲稳定系数大于5,结构稳定性满足规范要求;(5)本桥满足"小震不坏、中震可修、大震不倒"的抗震设计目标。
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＂.
出处
《铁道工程学报》
EI
北大核心
2013年第4期56-60,119,共6页
Journal of Railway Engineering Society
关键词
津保铁路
矮塔斜拉桥
空间分析
Tianjin -Baoding Railway
short tower cable -stayed bridge
spatial analysis
