Study on Optimization of Construction Procedure in Cable Area of Main Beams of Extradosed Cable-stayed Bridges
Compared with continuous rigid frame Bridges,extradosed cable-stayed bridge have more cable-stayed construction links,which increases the complexity of the construction process of the cable area of the main beam.The existing design process generally has a longer duration,and there are conflicts on the working surface.Based on Mozhai Wujiang bridge,this paper carried out optimization research on construction process of cable area of main beam by establishing numerical models of different cable operation.The main research conclusions are as follows:1)The delayed construction of the cable can solve the conflict of the working face and avoid the problem that the strength of the initial poured concrete does not meet the tensioning conditions.Meanwhile,the construction can be carried out in parallel and the construction period can be saved;2)The construction of the cable is delayed by 1 section,which has little influence on the cable force,the stress and deformation of the main beam,and the deviation of the cable force meets the requirement of no filling tension.When the cable is delayed by 2 sections,it has little effect on the cable force and the stress on the upper edge of the main beam.The deviation of the cable force is smaller than 5%,but it has obvious effect on the deformation of the main beam and the stress on the lower edge;3)The construction process that the cable lags by 1 section construction is relatively safe and feasible,which can save the construction period and will not excessively increase the difficulty of construction control.
extradosed cable-stayed bridgecable area of main beamconstruction process optimization
万方数据
维普
