辅助吊杆加固三拱肋钢管混凝土系杆拱施工监控研究

发布时间：2018-01-31 03:50

本文关键词： 施工监控钢管混凝土系杆拱桥辅助吊杆桥面变形吊杆内力维修加固　出处：《铁道建筑》2015年12期 　论文类型：期刊论文

【摘要】：受损三拱肋中承式钢管混凝土系杆拱桥在加固过程中采用辅助吊杆内力和桥面变形双控制原则,对辅助吊杆增设过程进行施工监控。根据实测值修正有限元计算模型,确保结构在各种工况下以及成桥后,内力和变形均处于合理状态,满足规范要求。研究结果表明:完成全部辅助吊杆张拉后,桥面各测点实测累计变形控制在允许范围内,最大未超过6 mm;吊杆内力实测值和理论计算值较吻合,差值绝大多数在-10~30 k N,加固完成后吊杆内力和桥面线形均达到了设计目标。
[Abstract]:In the process of reinforcement, the internal force of auxiliary suspenders and the deformation of bridge deck are controlled by the principle of double control of the internal force of the damaged three-arch rib through concrete-filled steel tubular tied arch bridge. According to the measured value, the finite element calculation model is modified to ensure that the internal force and deformation of the structure are in a reasonable state under various working conditions and after the completion of the bridge. The results show that the accumulated deformation of the measured points of the bridge deck is controlled within the allowable range and the maximum is not more than 6 mm after the completion of the tension of all the auxiliary suspenders. The measured value of the internal force of the suspender is in good agreement with the calculated value in theory, and the difference value is mostly -10 ~ (30) KN. After the reinforcement is completed, the internal force of the suspender and the shape of the bridge deck reach the design goal.
【作者单位】：西南交通大学土木工程学院;
【分类号】：U445.72
【正文快照】： 1工程概述中承式钢管混凝土系杆拱桥,桥跨布置为1孔净跨72 m,桥面总宽度24.5 m,横向布置:2×8.0 m(行车道)+2×3.0 m(人行道)+2.5 m(中间分隔带),设计荷载等级:汽车—20级,挂车—100,人群荷载3.5k N/m2。拱轴线为二次抛物线,矢跨比为1/5。全桥共有3片拱肋,每片拱肋为哑铃形截

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