南淝河特大跨度钢桁梁柔性拱桥施工过程力学分析及监控  

MECHANICAL ANALYSIS AND MONITORING FOR CONSTRUCTION PROCESS OF THE SUPER-SPANNED STEEL BRIDGE NEAR NANFEI RIVER

作　　者：刘凯[1] 牛忠荣[1] 杜伟[1] 方继 

机构地区：[1]合肥工业大学土木与水利工程学院,合肥230009 [2]中铁四局合肥中铁钢结构公司,合肥230022

出　　处：《工业建筑》2013年第10期106-111,169,共7页Industrial Construction

基　　金：国家自然科学基金项目(11272111)

摘　　要：南淝河特大跨度铁路桥(114.75 m+229.5 m+114.75 m)为下承式、连续刚桁梁柔性拱桥,采用单边带拱顶推、拱脚合龙的新施工方案。为确保施工安全,建立桥梁施工过程中各阶段的空间结构力学模型,采用有限元法对结构应力、位移以及稳定性等进行力学分析,由此对施工过程提供安全性预测和监控实施。依据计算结果对施工工况中超应力杆件提出了加固措施,确保了桥梁结构满足应力强度和稳定性的安全要求。监测了各施工工况下重点关注构件的应力,应力实测值与有限元计算值较吻合,表明监测工作对全桥施工过程的力学分析和监控实施的效果良好。The super-spanned railway bridge near Nanfei River is a through steel bridge composed of the continuous truss and flexible arch with main span being 229.5 m and each of two side spans being 114.75 m. The construction method of the bridge was a new one to use unilateral incremental launching with closing up on the arch foot. In order to ensure the construction safety, the mechanical models in all construction stages were established and the finite element method was used to analyze the stress and displacement fields of the construction process. Then, the stability of the key members was evaluated. Thus, the safety prediction and monitoring of the construction process were implemented. On the basis of simulated results, the reinforcement project for members over allowable stress in the construction process was proposed, which made the bridge structure meet the stress strength and stability requirements within safety construction. Furthermore, the stresses of the key focused members in all construction stages were measured and monitored. It was found that the computed results of the stresses of the focused members were in agreement with the measured ones in the construction process. The practice of the construction process of the bridge has demonstrated that the mechanical analysis and monitored implementation in the present work were successful.

关 键 词：铁路桥 特大跨度 施工 顶推 有限元法 测试 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]