Concrete box girder structure is widely used in civil engineering field. Because of the poor thermal conductivity of concrete material,the large temperature difference between inside and outside of the box girder will happen in the condition of strong sunlight, which can lead to structural crack. In order to avoid cracking of box girder,the use of phase change energy storage technology aiming to control temperature difference was presented, which should below the limit value. Three chloro three fluoroethane (R113) gas-liquid phase change material was selected. Through experiments this method can effectively control the box girder temperature difference between in-side and outside,thus make the function of automatic temperature adjust.%混凝土箱梁结构广泛应用于土木工程领域.由于混凝土材料导热性能差,在强烈日照情况下,箱梁内外会产生过大温差,从而导致结构开裂.为了从根源上防止箱梁开裂,提出了运用相变储能技术控制箱梁结构内外温差不超过开裂温差限值的新思路;选取三氯三氟乙烷(R113)液气相变材料,通过试验验证该方法能够有效控制箱梁结构内外温差,起到自调温的作用.
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