Research purposes: The platform canopy of Xi 'an North Station of Zhengzhou ?Xi 'an Passenger Dedicated Line is composed of steel column, cantilever beam and chord - stayed pole. One end of the chord - stayed pole is connected with the steel column and the other end is connected with the canopy. The steel chord - stayed poles are arranged symmetrically on the two sides of the steel column with pre - stressing to form the self - equilibrating system for reducing the length of the canopy and controlling the shape - finding of the structure. According to the project characteristics, the various influence factors on the force of the chord - stayed pole during construction were analyzed, and by simulation analysis of the whole construction process, the important parameters of fitting length of the pole without stress and the tensioning force during construction were determined to control the whole construction process. Research conclusions: From the analysis it is concluded (1) Before construction the simulation analysis of the whole tensioning process should be made to make sure the cable tensioning is in control. (2) The real - time and tracing monitoring should be conducted during construction. (3) The calculation result should be compared with the monitoring result to prove the validity of the simulation analysis with finite element and the feasibility of the construction plan.%研究目的:郑西客运专线西安北站站台雨棚由钢立柱、悬挑钢梁和钢拉杆组成,钢拉杆一端与钢柱连接,另一端与雨棚相连.钢拉杆在立柱两端对称布置,并施加预应力,形成自平衡体系,减小了雨棚悬挑长度,并控制结构找形.针对工程特点,分析施工过程中影响拉杆力的各种因素,通过对施工全过程的模拟分析,确定拉杆无应力安装长度、施工张拉力等重要参数,掌握施工全过程状态.研究结论:针对本工程特点,通过分析得出:(1)施工之前,须对结构做施工张拉全过程模拟分析,确保拉索张拉施工均处于可控状态；(2)施工过程中应实时跟踪监控；(3)将计算结果与监测结果进行比较,证明了有限元模拟分析的正确性以及施工方案的可行性.
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