Current Research Status of Construction Control Techniques and Load-Bearing Performance of Bearings for Long-Span Bridges with Longitudinal Slopes

Abstract

In response to the current research status of construction control techniques and load-bearing performance of bearings for long-span bridges with longitudinal slopes, this paper reviews the research progress from two aspects: construction control and load-bearing performance. In the field of construction technology: methods such as top-down integrated construction and floating crane coordinated installation have been proposed. Combined with the full-process quality control method for prefabricated components, these methods have solved the problem of efficient construction of bridges in complex terrains. In terms of load-bearing performance: the frictional effect of movable bearings can reduce the peak longitudinal force of rails by 23%, and the contradiction between "stiffness and stress" of longitudinal slope bridges can be balanced by regulating the friction coefficient. The innovatively developed numerically controlled leveling bearings and combined seismic isolation technologies have respectively reduced the installation eccentric pressure risk by 90% and the seismic response by 40%–50%. At present, it is necessary to break through the bottleneck of multi-field coupling simulation and intelligent monitoring technologies. In the future, efforts should be made to develop full-life self-adaptive bearing design and digital twin operation and maintenance systems, and to promote the transformation of bridge safety from passive treatment to intelligent pre-control.