大跨度悬索桥结构架设参数精细算法研究

针对已有计算方法存在的不足之处，提出了一种大跨度悬索桥结构构件的无应力尺寸及鞍座、索夹的预偏量等架设参数的精细算法。该法考虑了二期恒载由主缆和加劲梁共同承担的实际情况；应用了小应变弹性悬链线单元、ＣＲ列式法梁单元，精确方便地模拟了鞍座及鞍座与主缆相切点的运动，通过迭代方法得到架设参数。江阴长江大桥架设参数计算的应用实例表明该法具有较高的精度。

STUDY ON THE FINE METHOD OF CALCULATING THE ERECTION-PARAMETERS OF LONG-SPAN SUSPENSION BRIDGES

In view of the drawbacks of the existed methods, a fine method of calculating the erection-prarameters such as the unstressed lengths of structural members and the pre-biased amounts of saddles and cable clips of long-span suspension bridges is presented. The fact that the second deadload of bridge is supported by both the main cable and the stiffening girder is into consideration in this method. By employing the small strain elastic catenary element and beam element based on CR formulation, the contacts and movements between saddles and main cables are modeled accurately and easily. The erection -pa rameters are obtained by the iteration method. A numerical example of Jiangyin Yangtze River Bridge is given, which proves that this method is more precise.