Abstract: Taking Da-ning River Bridge in construction as the engineering background, the optimization analysis of cable forces and segmental cambers has been carried out during the process of arch rib segmental installment. A modified inverted mcthod including cable force penalty factor is put forward, a formula of calculating penalty factor is deduced, and a corresponding FEA model is established by ANSYS. The analytical result shows that this method is of high accuracy, and the restilts of this method are in good accordance with those got in practice.

Key words: Da-ning River Bridge , arch rib installation , OPT mathematical model , penalty factor , modified inverted method , cable force , segmental camber ;

摘要： 以在建的大宁河大桥为工程背景,开展拱肋吊装过程扣索索力和预抬量的优化分析。提出了引入索力罚系 数的修正倒拆法,推导了罚系数的计算公式,利用ANSYS建立了相应的倒拆分析模型。计算结果表明,该方法具 有计算精度高的优点,与实测结果吻合良好。

关键词: 大宁河大桥, 拱肋安装, 优化数学模型, 罚系数, 倒拆修正法, 扣索索力, 预抬量