摘要
以在建的新龙门大桥为工程背景,开展拱肋吊装过程扣索索力和预抬量的优化分析。采用有限元计算与优化分析相结合的方法对扣索索力和预抬值进行求解,索力和预抬值的计算以拱肋各标高控制点的高程偏差平方和最小为优化目标,以拱肋各个控制点的标高偏差为状态变量,采用一阶分析法对设计变量进行迭代优化。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。
With New Longmen Bridge for engineering background,the optimization analysis of cable forces and segmental cambers have been performed during arch rib segmental installment process.The method of FEM analysis combined with optimization was calculate the cable forces and segmental cambers.The calculate aimed at the square sum of the altitude deviation of all attitude-controlled nodes;it was limited by the allowable odds of the attitude-controlled nodes.The first order optimization method was introduced to acquire the cable forces and segmental cambers.The analytical result shows that this method has a high accuracy and tallies with practice.
出处
《交通科技与经济》
2010年第5期77-80,共4页
Technology & Economy in Areas of Communications
关键词
拱肋安装
一阶分析法
扣索索力
预抬量
arch rib installationfirst
order method
cable force
segmental camber
