中承式钢管混凝土劲性骨架拱桥拱肋吊装施工控制

发布时间：2018-06-27 05:36

本文选题：拱桥 + 钢管混凝土结构　；参考：《桥梁建设》2017年05期

【摘要】：广安官盛渠江大桥主桥为主跨320m的中承式钢管混凝土劲性骨架拱桥,劲性骨架采用斜拉扣挂法施工,施工过程中扣索一次张拉到位。针对正装分析法和倒退分析法2种索力计算方法的局限性,为了精确计算扣索索力及节段安装预抬标高,使成拱线形接近理论线形,提出以成拱线形为控制目标的优化索力调整方法,利用MIDAS Civil 2015建立吊装阶段的全桥有限元模型,考虑切线位移对之后施工阶段的影响,以线形控制为主、索力控制为辅,分析该桥的线形、扣索和尾索索力、弦杆应力,并与实测值对比。结果表明:大桥的线形、扣索和尾索索力、弦杆应力的实测值与理论值符合度非常高,主拱线形及结构应力满足设计及规范要求。说明该优化索力调整方法是可行有效的。
[Abstract]:The main bridge of Guanshengqujiang Bridge in Guanan is a through concrete filled steel tube rigid skeleton arch bridge with a main span of 320m. In view of the limitation of two methods of cable force calculation, the formal and retrogressive analysis methods, in order to accurately calculate the buckle cable force and the pre-lifting elevation of the segment, the arch line is close to the theoretical line shape. In this paper, an optimized cable force adjustment method is put forward, in which the arch shape is taken as the control objective, and the finite element model of the whole bridge is established by Midas Civil 2015. Considering the influence of tangent displacement on the later construction stage, the linear control is the main control, and the cable force control is auxiliary. The linear, cable and tail cable force and chord stress of the bridge are analyzed and compared with the measured values. The results show that the measured values of the linear, cable and tail cable forces and chord stress of the bridge are in good agreement with the theoretical values, and the main arch linear and structural stresses meet the design and specification requirements. This method is feasible and effective.
【作者单位】：重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地;重庆交通大学土木工程学院;
【基金】：国家自然科学基金项目(51478071) 重庆市基础与前沿研究计划重点项目(cstc2015jcyjBX0022) 交通运输部建设科技项目(2015318814190)~~
【分类号】：U445.4

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