摘要
吊杆索力控制对拱桥结构的安全性和可靠度有很大的影响,是拱桥施工的难点问题。根据一定的张拉顺序,通过MIDAS软件建立有限元模型得到所需的吊杆索力样本库。以成桥设计索力作为径向基函数法(RBF法)的输入向量,所求的初始索力为输出向量。利用分布密度参数控制求解精度,逼近两者之间的非线性映射关系,直接计算出吊杆初索力。研究表明:BRF法可以将索力的计算值与设计值之间的误差控制在5%以内,满足工程要求。
Cable tension control has a great influence on security and reliability of tie-arch bridge,which is the key problem of arch bridge construction.Based on a certain tension sequence,a whole bridge model was established through software MIDAS,so that the required sample database of the cable tension were obtained.This method adopted the finally designed cable tension as input vector and the calculated initial value as output vector.Distribution density parameter was used to control the accuracy of solution,then approximate to the nonlinear relationship between input and output,finally to calculate the initial cable tension directly.The results showed that the precision can be controlled within 5% by RBF method,and thus satisfy the engineering requirements.
出处
《钢结构》
北大核心
2015年第9期56-58,共3页
Steel Construction
关键词
径向基函数(RBF)法
拱桥
索力
radial basis function（RBF）method
arch bridge
cable tension
