Construction Simulation Of Highway Cable-Stayed Bridge On Yunyang Changjiang River

The cable-stayed bridge is an indeterminate structure with high degrees, and the design objective has relativity with the process of construction, and it is hard to construct this bridge. For the segmental-construction P.C. cable-stayed bridge, difference in temperature, shrinkage and creep sophisticatedly affect the course of its construction. After closure, with the strength of concrete, the adjustable range of internal force and configuration is narrow. So rigorous control of construction is the guarantee of achieving design objective. Basing on YunYang ChangJiang Bridge, the imitation of the construction control of cable-stayed bridge, and control of the course of cantilever casting concrete were discussed in this paper.First, basing on the achievements of the former exports , the sixty-four-dollar question of construction control of cable-stayed bridge were discussed and analyzed. The chief problem of the construction control of cable-stayed bridge is making certain the content, principle, and measure. At the same time imitate the bridge, and take the imitation result as theory track of the construction control. So, the content and principle of construction control of cable-stayed bridge were discussed and analyzed, and from the point of cybernetics the opening loop control, closed loop control, and adaptive control were summarized. Forward-calculation method and back-running method and forward- iterative-calculation method and no-stress method are methods, which are used at the construction control of cable-stayed bridge. These methods were analyzed and discussed and some problems that should be resolved in the future were discussed in this paper.Second , Visual Structure Expert System(VSES) was used in forward-calculation of construction control of YunYang ChangJiang Bridge. The function and method of Visual Structure Expert System (VSES) were introduced particularly. For the first time Visual Structure Expert System (VSES) was used for cable-stayed bridge construction control imitation. The imitated measure ofstructure component and the partition of the segment of construction were analyzed and discussed. Girder cell was used to imitate the cable cell, and the effect is preferable. The result of the imitation was labored, and the change rule and influencing factor of all the parameter in Forward-calculation for cable-stayed bridge construction control are summarized, which has high reference value for similar cable-stayed bridge.Finally, the construction control system of cable-stayed bridge was discussed primarily, and the metrical result and imitated result were analyzed contrastively. The reason and influence of parameter s error and parameter forecast and the precision that the parameter s error should be achievement were discussed primarily. The key point of construction control of cable-stayed bridge is how to define and adjust the elevation of formwork and how to adjust the stress of the cable, which were discussed primarily in this paper. The metrical parameter and imitated parameter of construction control is coincided. Imitational precision is good, which demonstrate that Visual Structure Expert System (VSES) can be used to imitate cable-stayed bridge construction control, under the condition that forward-calculation is used and girder cell is used to imitate the cable cell, which is capable of acquire better control precision.Setting up a scientific and reasonable and useful construction control system is the key point of assuring that the cable-stayed bridge will be constructed safely and smoothly.