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斜拉索无应力索长是斜拉桥施工和设计中的关键参数之一。目前常用的悬链线算法虽然可以精确计算出拉索无应力索长,但计算过程繁琐,不便于工程上应用。笔者基于悬链线理论,通过建立索端水平分力与拉索无应力长度之间的关系,提出以水平分力为迭代控制参数求解拉索无应力索长的实用迭代算法。将该法运用于在建黄舣长江大桥无应力索长计算,并与常用悬链线算法进行对比,对比计算结果表明:该法具有收敛速度快,精度高且计算简便的特点,便于实际工程的应用。
Stress-free stay cables are one of the key parameters in the construction and design of cable-stayed bridges. At present, although the commonly used catenary algorithm can accurately calculate the cable length without stress, the calculation process is cumbersome and inconvenient for engineering application. Based on the catenary theory, a practical iterative algorithm is proposed to solve the problem of cable length without stress by using horizontal component force as iterative control parameter, by establishing the relationship between the cable horizontal component force and the cable unstress length. The method is applied to the calculation of stress-free length of the Huangtang Yangtze River Bridge under construction and compared with the commonly used catenary algorithm. The comparison and calculation results show that the method has the characteristics of fast convergence, high precision and simple calculation, and is convenient for practical engineering Applications.