郑州大学学报（理学版）

为了保障钢管混凝土系杆拱桥施工安全和质量,以南水北调中线工程某钢管混凝土系杆拱桥为例,采用有限元软件MIDAS/Civil建立该桥有限元计算模型,按照施工过程详细分析各施工阶段的变形、吊杆力和应力,对吊杆成桥张拉力进行探讨,并选用自适应控制方法进行现场施工控制.由数值分析和现场监控结果可以得出,大桥在施工过程中结构的变形较小,受力满足设计规范要求;考虑到钢管混凝土系杆拱桥拱肋、系梁的刚度相对较柔,可采用恒载索力作为成桥张拉索力控制值,并以成桥后系梁和拱肋线形作为吊杆索力调整的施工依据;施工控制表明成桥线形和受力满足设计要求,成桥索力与恒载索力基本吻合.

The concrete filled steel tubular tied arch bridges of south-to-north water diversion middle route project was taken as an example. MIDAS / Civil software was used to build finite element model of the bridge. The displacement,stress and hanger rob tension of the bridge were analyzed respectively in detail in order to ensure construction safety and quality of the bridge in different stages of bridge construction. And the hanger rob tension of the completed-bridge was also discussed. Adaptive control method was selected to control bridge construction. The results of numerical analysis and the field monitoring showed that the structural displacement was small during construction,and the structural force satisfied the design specification. The stiffness and flexibility of the arch rib and tie beam was reasonable. The hanger rob dead-load's tension was regarded as control force. At the same time,the tie beam and arch rib's shape were selected to be the hanger rob tension adjustment foundation. From construction control,completed-bridge's shape and stress satisfied design requirements. The completed-bridge's hanger rob tension was basically coincided with the dead-load's.