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。
During the suspenders replacement of a half-through arch bridge,considering the influences of the increase of dead load on the cable force and the bridge alignment with the reconstruction of bridge deck,construction monitoring was need.The monitoring procedure was divided into two stages of initial replacement and subsequent adjustment.In the stage of initial replacement,according to the influence matrix method,the theoretical tension forces of each pair of cables were calculated to make bridge alignment to reach presetting-height.Meanwhile,the stiffness of deck system was identified by actual measured data.In the stage of subsequent adjustment,the measured stiffness of deck system,the cable force and the bridge alignment were optimized based on quadratic programming.The results show that the cable force and the bridge alignment are controlled well by using this method,and can meet the practical engineering requirements.
作者
王石磊
WANG Shilei(China Academy of Railway Sciences, Beijing 100081, China)
出处
《铁道建筑》
北大核心
2017年第2期11-15,共5页
Railway Engineering
关键词
拱桥
吊杆更换
二次型规划算法
刚度识别
施工监控
Arch bridge
Suspender replacement
Quadratic programming
Stiffness identification
Construction monitoring
