下承式系杆拱桥设计时,系杆的线形通常选用直线线形。但因设计或某方面需要也会采用曲线型系杆。文章以新张公路桥主桥为背景,采用通用有限元软件建立计算模型研究和分析了不同线形形式的系杆对拱桥结构性能的影响。通过分析可知,下承式系杆拱桥结构不宜选取曲线形系杆进行设计和施工。 Under the tie-rod arch bridge design, the linear shape of the tie rod is usually used linear. However, due to the design or some needs will also use curved tie rod. Based on the main bridge of Xinzhang Highway Bridge, this paper uses the common finite element software to establish the calculation model to study and analyze the influence of different linear forms of tie bars on the structural performance of the arch bridge. Through the analysis, we can see that under-tied tied arch bridge structure should not be selected curved tie rod design and construction.