拱桥吊杆更换施工监控方法研究

发布时间：2018-01-07 22:10

本文关键词：拱桥吊杆更换施工监控方法研究　出处：《铁道建筑》2017年02期 　论文类型：期刊论文

【摘要】：一中承式拱桥吊杆更换时,由于桥面系改造会增加恒载从而影响吊杆索力和桥面线形,故需要进行施工监控。施工监控分为吊杆初期更换和二次调索2个阶段:吊杆初期更换阶段,按照影响矩阵法计算出各对吊杆更换时的理论张拉索力,使得更换吊杆处桥面线形达到设计预抛高,并通过实测数据对桥面系刚度进行识别;二次调索阶段,基于桥面系实测刚度、索力及桥面线形按照二次型规划算法进行优化调整。施工监控结果表明采用上述方法桥面线形及索力控制效果良好,满足实际工程需求。
[Abstract]:When the suspenders of a middle through arch bridge are replaced, the cable force of the suspension rod and the line shape of the bridge deck will be affected by the increase of dead load due to the improvement of the bridge deck system. It is necessary to carry out construction monitoring and control. Construction monitoring is divided into two stages: the initial replacement of the suspender and the secondary cable adjustment: the initial replacement of the suspender, the theoretical tension of each pair of suspenders is calculated according to the influence matrix method. The line shape of the bridge deck at the replacement of the suspension rod reaches the designed height and the stiffness of the bridge deck system is identified by the measured data. In the stage of secondary cable adjustment, based on the measured stiffness of the deck system, the cable force and the line shape of the bridge deck are optimized and adjusted according to the quadratic programming algorithm. The construction monitoring results show that the control effect of the above method is good. To meet the actual engineering needs.
【作者单位】：中国铁道科学研究院;
【分类号】：U445.7
【正文快照】： 吊杆是中下承式拱桥连接桥面系和拱肋的关键构件,它将作用在桥面系上的恒、活载传递至拱肋,实现了拱桥的跨越能力。中下承式拱桥因其独特的力学美感及良好的跨越能力在我国桥梁建设中得到广泛应用。但是近年来国内多次出现了中下承式拱桥吊杆突然断裂、桥面垮塌的事故,造成了

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