延安火车站雨棚张弦梁随环境温度变化的结构性能研究

Research on the Structural Performance of the Beam String under Temperature Change in the Weather Shed of Yan'an Railway Station

通过分析延安火车站雨棚张弦梁随温度变化的结构性能,得出"张弦梁可以在水平方向自由伸缩,则张弦梁结构的水平位移随温度变化而线形变化,而其它均随温度变化而变化很小;考虑滑动端支座不同的摩擦水平反力,则张弦梁结构竖向位移、索力、拱梁端部剪力、拱梁弯矩、拱梁中间轴力等均随温度变化而线形减小或增大。因此考虑滑动端支座水平反力的大小对张弦梁的变形、位移、内力等随温度变化的影响程度是设计中应该考虑的"。分析结果应用于延安火车站雨棚张弦梁结构施工中。

It is analyzed in this paper the structural performance of the beam string under temperature change in the weath- er shed of Yan＇ an Railway Station. Under zero horizontal reaction of free support, the horizontal displacement of the beam string structure linearly changes with the temperature, while others change slightly with the temperature. Considering the different horizontal anti-friction forces of the sliding support, the beam string structure＇ s vertical displacement, cable force, shear force of the arch beam end, bending moment of the arch beam, axial force in the middle arch beam and so forth will increase or decrease linearly with the temperature change. Therefore, it should be considered in design the influence of the horizontal reaction of the sliding support on the string deformation, displacement, internal force＇ s variation with temperature change. The analyzing results have been applied in the construction of beam string structure of Yan＇ an Railway Sta- tion＇ s watershed.