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借鉴冷冻升温法和张力补偿法的思路,针对张弦梁拉索端部张拉力已知的结构,推导了考虑摩擦损失的迭代算法。以同济大学嘉定校区体育馆屋面张弦梁为例,对张拉施工过程的索力和结构变形进行有限元模拟计算,分析了索夹摩擦力对于施工最终状态的影响。在张拉完成阶段,索夹摩擦力会减小张弦梁结构的起拱位移,改变张拉最终状态索段轴力的分布情况。施工监测数据表明考虑索夹摩擦的有限元模拟结果更接近于实际。最后,分析了由环境温差而引起的结构变形,温度升高,结构竖向位移增大。
By referring to the idea of freezing temperature rise and tension compensation method, an iterative algorithm considering the frictional loss is deduced according to the known structure of tension at the end of the string string. Taking the string stringers of the roof of Gymnasium in Jiading Campus of Tongji University as an example, the cable forces and structural deformation of the tensioning process are calculated by finite element method. The influence of the friction of the cable clips on the final construction status is analyzed. During the completion of tensioning, the friction of the cable clamp will reduce the arching displacement of the beam string structure and change the distribution of the axial force in the cable tension section. Construction monitoring data show that the simulation results of the finite element considering the friction of the cable clamp are more realistic. Finally, the deformation of the structure caused by the temperature difference of the environment is analyzed, the temperature is increased and the vertical displacement of the structure is increased.