在桥梁中,温度变化能产生相当大的温度应力,某种情况下,可与恒、活载产生的应力相比。以往对桥梁结构的温度应力,因缺乏认识,通常都没有计算或考虑这一重要因素,所以设计的桥梁结构,不是由于设计得太强、过于安全,就是由于设计过弱,引起严重裂纹,以致结构损坏、影响运营。因此,这是关系桥梁结构经济、安全的一个重要问题。 In bridges, temperature changes can produce considerable temperature stress, in some cases, with constant, live load generated stress compared. In the past, due to a lack of understanding of the thermal stress of bridge structures, this important factor was not usually calculated or considered. Therefore, the designed bridge structure is not designed to be too strong or too safe due to too weak a design and causing serious cracks Structural damage, affecting operations. Therefore, this is an important issue concerning the economic and security of the bridge structure.