摘要
目的为使斜拉扣挂法吊装施工的大跨度钢管混凝土拱桥钢管拱肋在合拢前满足要求.方法采用最优化理论对扣索初张力和预抬高值进行预测求解,在安装第一个钢管拱肋节段时,把合拢段除外的其余所有梁段有限元模型一次生成,以考虑节段间转角连续引起的刚体位移,施工控制的目标为合拢前各钢管拱肋节段高程控制点的标高误差满足要求,采用一阶分析法对节段安装预抬高值进行正装迭代优化求解.结果在一上承式钢管混凝土拱桥施工控制的实际应用结果表明该方法计算简便,可准确地给出各个施工节段得扣索初张力和预抬高预测值.结论利用一次生成模型法进行拱肋吊装迭代优化计算,能方便的考虑拱肋节段转角引起的刚体位移,可较准确地给出满足要求的施工控制预测值.
Aiming at the characteristics and problems on rib-hoisting of long span CFST arch bridge, the optimization theory was introduced to predict the cable tension and pre-camber value, and the rigid displacement caused by rotational displacement continuum was also considered. While assembling the first segment, all segments of the FEM model without weight but the closure segment were generated at the same time, and then loaded it according to the order of construction. The object of construction control was to set the elevation deviation of reference points on rib in an appropriate range. The first-order analytical method was adopted to solve the pre-carnber value by iterative optimization method. This method was used in the construction control of a deck arch bridge and turned out to be practical and simple. It can present the prediction value of buckled cable tension and pre-camber quite accurately.
出处
《沈阳建筑大学学报（自然科学版）》
EI
CAS
2008年第3期371-374,共4页
Journal of Shenyang Jianzhu University：Natural Science
基金
国家自然科学基金项目(50478042)
关键词
钢管混凝土拱桥
施工控制
刚体位移
迭代优化
CFST arch bridge
construction control
rigid displacement
iterative optimization
