轨道交通混凝土梁温度变形影响因素分析

影响轨道梁温度变形的因素包括外部因素和内部因素.外部因素即环境温度、太阳辐射及其它气候因素;内部因素与结构自身的构造形式、材料等有关.主要从构造和材料方面来研究与结构相关的影响因素.研究了结构体系、截面形式和梁高参数对温度变形的影响,并分析骨料、水灰比及含水量等对混凝土弹性模量和热工参数的影响.在此基础上,结合我国不同的轨道交通混凝土梁的构造要求,提出减小温度变形的措施,如:选择合理的结构体系,增加截面底板宽度和梁高,提高混凝土的弹性模量和导热性能等.

Influential Factors of Concrete Girder Temperature Deformation

The influential factors of concrete girder temperature deformation include exter nal and internal ones. This paper studies the factors related to the structure,t he constitution and the material, investigates the effects of structural system, se ction shape, and the height of girder unders temperature deformation. As the gir der's temperature deformation depends on the Young's modulus and the thermodynam ics parameters of concrete, the relationship between these material parameters a nd skeletal material,between water cement ratio and moisture content of concrete are analyzed as well. Based on the above studies, this paper proposes the schem es to reduce the girder's temperature deformation,such as selecting reasonable s tructural system,increasing bottom width of section or height of girder,improvin g the Young's modulus and heat conduction performance of concrete etc.The conclu sions of this study can be valuable references for the designs of analogous stru ctures.