怒江特大桥钢桁拱合龙前空间位置温度影响分析

Analysis of Temperature Influence of Spatial Position Before Closure of Steel Truss Arch of Nujiang Bridge

为满足交通流量及景观需要,桥梁工程建设规模及力度不断增大,大跨度钢结构桥梁工程日益增多,结构也愈加复杂。温度作用对该类桥梁结构的影响不可忽略,甚至成为设计与施工中控制荷载的一部分。温度作用对桥梁结构的影响主要体现在温度应力和温度变形两方面,而确定温度应力和温度变形的前提是先确定温度荷载。在桥梁结构中温度荷载以温度场的形式存在。本文结合大瑞铁路怒江特大桥施工,持续一年对桥址处温度进行监测,并构建Midas/Civil有限元模型,对结构在温度变化下的变形进行计算分析,从对温度场及温度应力的研究来分析主桥钢桁拱合龙温度效应影响。

In order to meet the needs of traffic flow and landscape,the scale and intensity of bridge construction are increasing. With the increasing number of long-span steel bridges,the structure is becoming more and more complex. The temperature effect on such bridge structure should not only be considered in the design stage,but also is an important factor to control the load in the construction. The influence of temperature effect on bridge structure is mainly reflected in the aspects of temperature stress and temperature deformation,and the premise of determining the temperature stress and temperature deformation is to determine the temperature load first. In the bridge structure,the temperature load exists in the form of temperature field. This paper is based on the construction of Nujiang Bridge on Dali-Ruili Railway to monitor the temperature variation around the bridge for one year in a row,and builds Midas/Civil finite element model to calculate and analyze the deformation of the structure under the temperature variation. The temperature effect of the steel truss arch closure of the main bridge is analyzed from the study on the temperature field and the temperature stress.