(1 同济大学建筑工程系， 上海 200092; 2 同济大学建筑设计研究院(集团)有限公司， 上海 200092;

 3 浙江省电力设计院， 杭州 310012)

［摘要］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。

［关键词］张弦梁； 索夹摩擦； 有限元模拟； 施工监测； 环境温差

中图分类号： TU391 文献标识码： A文章编号：  1002-848X(2016)S1-0532-05

Force analysis and construction monitoring of beam string structure in prestressing phase

Zhao Danwei1， Zhang Xiaoguang2， Wang Zihua3

(1 Department of Building Engineering， Tongji University， Shanghai 200092， China

2 Tongji Architectural Design (Group) Co.， Ltd.， Shanghai 200092， China

3 Zhejiang Electric Power Design Institute， Hangzhou 310012， China）

Abstract： The paper uses frozen-heated method and tensile force compensation analysis method for reference, for beam string structure with known tension, proposes an iterative algorithm considering friction loss. Through the roofing beam string in Gymnasium of Jiading Campus of Tongji University, the cable force and nodal displacement during pre-stressing construction are analyzed by finite element simulation. The impact in construction terminal station by friction in cable clamp is studied. In prestressing end phase, friction decreases the vertical displacement and changes the distribution of axial force in cable. Construction monitoring data shows the simulated output considering friction is more accurate. Lastly, the deformation caused by environmental temperature difference is analyzed. Vertical displacement increases with the temperature rise.

Keywords： beam string; friction in cable clamp; finite element simulation; construction monitoring; environmental temperature difference