Additional Temperature Forces of Continuous Welded Rail on Large-Span Steel Truss Cable-Stayed Bridge

Interaction between Track and Long-Span Cable-Stayed Bridge: Recommendations for Calculation

“…e ballast longitudinal resistance in the above calculation models of CWR on bridges is mainly simulated with nonlinear springs [10][11][12][13][14][15][16][17][18][19][20][21]; the displacementforce (D-F) curves of the ballast longitudinal resistance are expressed by the solid lines shown in Figure 1. Suppose that the longitudinal displacement of a bridge node obtained from the completion calculation of a cable-stayed bridge is a; in order to prevent the impact of the completion calculation on bridge-track interaction, the D-F curves of nonlinear springs connected with the bridge node are expressed by the dash lines shown in Figure 1; the mathematical model is expressed by…”

“…Petrangeli established a 2D model for longitudinal bridge-track interaction of CWR on a cable-stayed bridge (span: 104 + 192 + 104 m) using the SAP2000 software and studied the distribution of rail longitudinal force [12]. e research group led by Wang et al, by taking a twin-tower two-cableplane cable-stayed bridge (span: 36 + 96 + 228 + 96 + 36 m) of high-speed railway as an example, also established a 2D model through simplifying the main beam into beam elements and created a calculation program with the finite element software ANSYS [13][14][15]. e research group led by Dai and Yan also studied the bridge-track interaction of CWR on a cable-stayed bridge (span: 32 + 80 + 112 m) and analyzed the impact of factors such as loading-history, pile-soil effect, and seismic load on bridgetrack interaction according to an integrated calculation model.…”

Analysis of the Influence of Track Lateral Irregularity on the Stability of Seamless Turnout

“…Many experts at home and abroad have studied the influence of different factors on the stability of Seamless turnout. Xu Shiru and others [2] analyzed the temperature force distribution and deformation of jointless turnout; Xu Qingyuan and others [3][4][5] analyzed the influence of track parameters on jointless turnout combination effect, studied the longitudinal force and displacement of jointless turnout rail with finite element method, and obtained the calculation model of additional force of jointless track on bridge; Gao Liang and others [6] analyzed the spatial mechanical characteristics of seamless turnout on bridge; Tang Jinfeng and others [7,8] analyzed the effect of temperature gradient; Japan Yanagawa Hideaki [9] researched under different initial bending curve radius and the stability of the seamless line problem, Feng Qingsong and others [10] was studied under the action of temperature force seamless line drum up instability problem, when the initial bending is 1 cm, the former temperature 50 °C lateral displacement is roughly 1 mm, the latter temperature 50 °C lateral displacement is roughly 2 mm, more than the displacement limit line will likely damage; Yan Le and others [11] analyzed the influence of slope on the stress and deformation of jointless turnout on long ramp bridge; Zhou Haiyu and others [12,13] studied the influence of track irregularity on the stability of CWR; but they did not analyze the stability of jointless turnout in turnout area of subgrade section under the action of temperature force. Especially in permafrost regions, the subgrade section has such problems as large daily temperature difference, changeable climate, and many large and long ramps [14].…”