Abstract
Continuous welded rail (CWR) has been widely applied to the Chinese high-speed railways. It is interesting to reduce the effect of rail longitudinal force on the long-span cable-stayed bridges. Taking the pile-soil interaction into account, the finite element model of CWR on the long-span cable-stayed bridge is established based on the bridge-track interaction theory. The rail longitudinal force can be reduced and the track stability can be improved significantly by installing Rail Expansion Joint (REJ). The layout scheme of REJ plays a controlling role on designing CWR on bridges. Results show that the unidirectional REJ should be laid on both ends of the long-span cable-stayed bridge. Switch rails of REJ are set up on the main beam, stock rails are laid on the simply supported beams and crossing over beam joints, and several-meter long small resistance fasteners need to be laid on the sides of stock rails to reduce the fixed pier longitudinal force near the main beam. The range of REJ laid on cable-stayed bridge is mainly determined by temperature, rail breaking, and seismic condition; the bending and braking loads have little influence on it. Multiple field tests are carried out to prove the validity of the numerical model and the design methodology.
Highlights
E track and cable-stayed bridge are investigated in different aspects, including the exploration of nonlinear finite element model (FEM) of cable-stayed bridges [11], nonlinear analysis program [12], nonlinear static analysis of cable structures [13], the influence of distinct parameters on the mechanical properties of track on long-span cable-stayed bridges by FEM [14], experimental tuning of the model [15], the distribution of rail longitudinal force including expansion force, and braking force on the cable-stayed bridges [16,17,18,19,20]. e simulation process and design of Continuous welded rail (CWR) on cable-stayed bridges are simplified [21]
Superposing rail basic thermal force and rail expansion force is to evaluate the stability of CWR with constant and small resistance fasteners. e amplitudes of rail longitudinal force are 2402.40 kN and 1981.90 kN under temperature rising condition, much larger than the permissible force of 1505.10 kN, which unsatisfied the requirements of track stability
Rail Expansion Joint (REJ) layouts are optimized by the stock rail longitudinal force at the main beam joint, adjacent pier longitudinal force, and beam-rail relative displacement
Summary
It is interesting to reduce the effect of rail longitudinal force on the long-span cable-stayed bridges. Taking the pile-soil interaction into account, the finite element model of CWR on the long-span cable-stayed bridge is established based on the bridge-track interaction theory. Results show that the unidirectional REJ should be laid on both ends of the long-span cable-stayed bridge. Switch rails of REJ are set up on the main beam, stock rails are laid on the supported beams and crossing over beam joints, and several-meter long small resistance fasteners need to be laid on the sides of stock rails to reduce the fixed pier longitudinal force near the main beam. E range of REJ laid on cable-stayed bridge is mainly determined by temperature, rail breaking, and seismic condition; the bending and braking loads have little influence on it. Multiple field tests are carried out to prove the validity of the numerical model and the design methodology
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