南阁大桥双索面斜拉桥拆除方案及监控方法研究

Research on Demolition Scheme and Monitoring Method for Cable-Stayed Bridge with Double Cable Plane of Nange Bridge

摘要: 为了相似斜拉桥拆桥工程提供安全监控建议，对斜拉桥旧桥拆除实例进行分析，采用“机械无损切割分离式方法拆除方案”，利用有限元软件(Midas Civil)计算出各阶段斜拉桥框架纵梁和横梁等主要受力构件上的应力及索塔的偏位，确定各阶段索力释放值，同时采用智能化的数据采集系统将实测数据与有限元模拟结果进行对比。结果表明机械无损切割分离式方法能确保斜拉桥旧桥拆除结构受力安全，对同类旧桥拆除施工监测有一定的参考意义。

Abstract: To provide safety monitoring advice for similar cable-stayed bridge demolition project, a ca-ble-stayed bridge demolition was taken as the study. The “Mechanical nondestructive cutting and separation method” and Midas Civil software were used to figure out the stress on the frame lon-gitudinal beam, beam of cable-stayed bridge, and the deviation of cable tower in each stage. At the same time, an intelligent data acquisition system was used to compare the measured data with the finite element simulation results. The results demonstrate that the mechanical nondestructive cutting and separating could ensure the stress safety for the old cable-stayed bridge demolition structure, and it provides experience and reference value for the selection of similar engineering demolition and construction monitoring methods.