温度变化对高速铁路连续梁桥的影响分析

Analysis for Influences of Temperature Changes on Continuous Beam Bridges on High-speed Rail

随着我国高速铁路的不断发展,山区铁路桥梁的数量也随之增加,越来越多的线路需要跨越深沟深谷,从而需要修建大量的高墩大跨桥梁。目前我国大部分高墩桥梁依然采用混凝土浇筑形式,而想要列车在这类桥上保持运行的平稳性和安全性,则需要解决温度变化和收缩徐变带来的影响。基于此,以某48 m+80 m+48 m的预应力混凝土连续梁桥为例,就温度变化对高速铁路连续梁桥的影响进行相关研究,分别研究桥梁结构在整体升、降温和局部温差情况下其产生的响应,包括桥面的竖向变形曲线,跨中横向最大位移,竖向、横向加速度等。研究结果对实际桥梁结构的修建和养护具有借鉴意义。

With development of high-speed railways in China, the number of railway bridges in mountainous area increases,and more and more lines need cross deep trenches and valleys. As a result,a lot of high-pier and large-span bridges shall be constructed. At present,most high-pier bridges in China are still cast with concrete. The influences caused by temperature changes and shrinkage creep shall be settled to keep stability and safety of train operation on such bridges. On this basis,and with a 48 m ＋80m ＋ 48 m prestressed concrete continuous beam bridge as an example,this paper carries out the related researches on the influences of temperature changes on continuous beam bridges on expressways,studies responses of bridge structures in the case of overall temperature change and local temperature difference.The responses include vertical deformation curves of deck,the max. lateral displacement of midspan,and vertical / lateral accelerations, etc. The results of research provide a reference for construction and maintenance of real bridge structures.