实用混凝土箱梁温度应力计算方法

Practical Calculation for Temperature Effect on PC Box Girder Bridge

骤然降温和日照温差在混凝土桥梁截面上产生非均匀的温度分布,从而产生温度应力,而各国规范给出的温度梯度模式又不能准确反应特定桥梁个体的实际情况。详细介绍了基于ANSYS的温度应力计算方法,可以考虑季节、桥梁地理位置、走向、材料特性、结构尺寸、翼缘板对腹板的遮阴作用等各种因素的影响,计算出一天任何时刻的温度分布,然后根据温度场计算结果用超级梁单元计算温度应力,不仅速度快而且对变截面梁、曲线梁等复杂情况均可取得满意结果。

The effect of abrupt drop in temperature and thermal difference due to the sun light on box girder will cause uneven temperature differences to the section of bridges, and then temperature stresses arise. While the design codes of different country on thermal gradient model in concrete bridges cannot convey the actual situation of a special bridge accurately. This paper recounts in detail how to calculate the temperature stress based on ANSYS. The offered method can calculate the actual temperature of bridges accurately any time in a day, which takes into account the effects of the season, location, orientation, structural size , material properties and the sunshade effect on the web by the flange plate of the box girder bridge, etc. With the method of thermalstructural coupling analysis, using the super-beam-element, the temperature effect can be calculated quickly, and this method can be used for variable cross-section and curved bridges.