Abstract
In order to explore the control effect of arch assisted system on long-term deflection of long-span PC continuous girder bridge, an evaluation framework of long-term deflection control effect is proposed. Firstly, the functional relationship between long-term deflection and structural parameters is fitted based on the measured data, and the deflection prediction model is established; Secondly, based on the calculation method of bending stiffness of inversion theory, the evaluation framework of long-term deflection control effect based on the analogy stiffness method is proposed; Finally, based on the engineering example, under the premise of equal load sharing ratio, the above frame is applied to carry out parameter analysis. The results show that the deflection prediction model based on the measured data has good correlation, and the established evaluation framework can quantitatively evaluate the control effect of arch auxiliary system on long-term deflection.
Highlights
Concrete continuous beam is a bridge type with strong comparability in economic rationality and process maturity
Ballastless track bridge beam [1], which is widely used in high-speed railway transportation, is difficult to adjust the deformation in time
In order to ensure smooth driving, the vertical deformation of main beam must be controlled; Yang [3] research found that creep deformation can cause obvious impact at the beam end, which is not conducive to highspeed driving
Summary
Concrete continuous beam is a bridge type with strong comparability in economic rationality and process maturity. In order to control the down deflection of long-span PC continuous beam bridge, the traditional methods such as prestress preparation beam [4] are the early attempts of engineers. This paper takes a long-span arch auxiliary PC continuous beam bridge as an example to analyze the control effect and evaluate the effect of long-term over deflection control measures. In order to reflect the real service condition of the structure as much as possible and reduce the calculation error in the process of parameter determination, this paper forecasts and analyzes the long-term deflection of PC continuous beam from the aspect of span and girder height by measuring the long-term deflection data of the bridge formed by different span beams from 5 to 10 years later. In order to simulate the real state of the structure, it is necessary to reduce the structural stiffness
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