基于温度影响的钢管混凝土脱空机理分析

Analysis on CFST Disengaging Mechanism Based on Temperature Impact

在简要介绍钢管混凝土拱桥脱空现状的基础上,分析不同来源的温差对钢管混凝土交界面的纵向拉应力和径向拉应力的影响。结果表明:在拱肋纵向,水化热引起的温差和日光、大气温度变化引起的温差都会引起交界面中的钢管和混凝土发生相对滑移;在拱肋径向,日光、大气温度变化引起的温差会导致混凝土发生脱空。

On the basis of brief introduction to the status quo of concrete-filled steel tubular（CFST） arch bridge disengaging, the impact of temperature from different sources on longitudinal tensile stress and radial direction tensile stress which is in interface between steel tube and core concrete is analyzed. The results show that： in arch rib longitudinal direction, the relative slip in interface between steel tube and core concrete is caused by the difference in temperature resulting from hydration heat, sunlight and the changes of atmospheric temperature; in arch rib radial direction, the concrete will be disengaged because of the difference in temperature resulting from sunlight and the changes of atmospheric temperature.