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主缆无应力长度是悬索桥施工控制的重要参数之一,采用通用有限元软件Midas/Civil对中渡长江大桥主缆无应力长度进行分析,并对计算结果进行修正,得到了中渡长江大桥主缆各索股无应力长度表。同时,研究了主缆弹性模量、主缆钢丝平均直径、加劲梁自重等因素对主缆无应力长度的影响。结果表明:主缆无应力长度与主缆弹性模量、主缆钢丝平均直径呈正比关系,与加劲梁自重呈反比关系,并通过线性拟合得到相关比例系数,可为同类型桥梁主缆无应力长度施工控制提供借鉴。
The stress-free length of the main cable is one of the important parameters in the construction control of the suspension bridge. The general finite element software Midas / Civil is used to analyze the stress-free length of the main cable of the Yangtze River Bridge and the correction of the calculation results. Stock without stress length table. At the same time, the main cable elastic modulus, the average diameter of the main cable, the weight of the stiffening girder and other factors on the cable without stress length. The results show that the main cable strain is proportional to the elastic modulus of the main cable and the average diameter of the main cable, and is inversely proportional to the self-weight of the stiffening girder. The correlation coefficient is obtained by linear fitting, Stress length construction control to provide reference.