混凝土箱梁应力与变形对温度梯度模式的敏感性分析

Sensitive Analysis of Stress and Distortion of Concrete Box Girder to Temperature-gradient

介绍了温度应力和温度梯度模式的分类.利用有限元方法,分7个工况计算6种温度梯度模式下在箱梁内部产生的温度应力以及引起的箱梁变形.分析预应力混凝土箱梁应力和变形对温度梯度模式的敏感性.结果表明,不同温度梯度模式在箱梁内产生的温度应力对预应力混凝土箱梁内部应力的影响较大,而且十分复杂.归纳出箱梁设计计算时应注意的主要问题.

The paper introduces the temperature stress and the patterns of temperature gradient. Using the finite element method, the paper calculates the stress and deformation of the box girder under the 7 load conditions and 6 patterns of temperature gradient, at the same time, analyses the sensitivity of the box girder about the temperature gradient. The results show that different patterns of temperature gradient cause heavy impacting on the prestressed concrete box girder. The distribution of the stress is very complex. At the end, the paper sums up the points that should be pay attention to the design of pre-stressed concrete box girder.